tor-browser

gtest.cc (248867B)

---

// Copyright 2005, Google Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
//     * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
//     * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

//
// The Google C++ Testing and Mocking Framework (Google Test)

#include "gtest/gtest.h"
#include "gtest/internal/custom/gtest.h"
#include "gtest/gtest-spi.h"

#include <ctype.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <wchar.h>
#include <wctype.h>

#include <algorithm>
#include <chrono>  // NOLINT
#include <cmath>
#include <cstdint>
#include <iomanip>
#include <limits>
#include <list>
#include <map>
#include <ostream>  // NOLINT
#include <sstream>
#include <vector>

#if GTEST_OS_LINUX

# include <fcntl.h>  // NOLINT
# include <limits.h>  // NOLINT
# include <sched.h>  // NOLINT
// Declares vsnprintf().  This header is not available on Windows.
# include <strings.h>  // NOLINT
# include <sys/mman.h>  // NOLINT
# include <sys/time.h>  // NOLINT
# include <unistd.h>  // NOLINT
# include <string>

#elif GTEST_OS_ZOS
# include <sys/time.h>  // NOLINT

// On z/OS we additionally need strings.h for strcasecmp.
# include <strings.h>  // NOLINT

#elif GTEST_OS_WINDOWS_MOBILE  // We are on Windows CE.

# include <windows.h>  // NOLINT
# undef min

#elif GTEST_OS_WINDOWS  // We are on Windows proper.

# include <windows.h>  // NOLINT
# undef min

#ifdef _MSC_VER
# include <crtdbg.h>  // NOLINT
#endif

# include <io.h>  // NOLINT
# include <sys/timeb.h>  // NOLINT
# include <sys/types.h>  // NOLINT
# include <sys/stat.h>  // NOLINT

# if GTEST_OS_WINDOWS_MINGW
#  include <sys/time.h>  // NOLINT
# endif  // GTEST_OS_WINDOWS_MINGW

#else

// cpplint thinks that the header is already included, so we want to
// silence it.
# include <sys/time.h>  // NOLINT
# include <unistd.h>  // NOLINT

#endif  // GTEST_OS_LINUX

#if GTEST_HAS_EXCEPTIONS
# include <stdexcept>
#endif

#if GTEST_CAN_STREAM_RESULTS_
# include <arpa/inet.h>  // NOLINT
# include <netdb.h>  // NOLINT
# include <sys/socket.h>  // NOLINT
# include <sys/types.h>  // NOLINT
#endif

#include "src/gtest-internal-inl.h"

#if GTEST_OS_WINDOWS
# define vsnprintf _vsnprintf
#endif  // GTEST_OS_WINDOWS

#if GTEST_OS_MAC
#ifndef GTEST_OS_IOS
#include <crt_externs.h>
#endif
#endif

#if GTEST_HAS_ABSL
#include "absl/debugging/failure_signal_handler.h"
#include "absl/debugging/stacktrace.h"
#include "absl/debugging/symbolize.h"
#include "absl/strings/str_cat.h"
#endif  // GTEST_HAS_ABSL

namespace testing {

using internal::CountIf;
using internal::ForEach;
using internal::GetElementOr;
using internal::Shuffle;

// Constants.

// A test whose test suite name or test name matches this filter is
// disabled and not run.
static const char kDisableTestFilter[] = "DISABLED_*:*/DISABLED_*";

// A test suite whose name matches this filter is considered a death
// test suite and will be run before test suites whose name doesn't
// match this filter.
static const char kDeathTestSuiteFilter[] = "*DeathTest:*DeathTest/*";

// A test filter that matches everything.
static const char kUniversalFilter[] = "*";

// The default output format.
static const char kDefaultOutputFormat[] = "xml";
// The default output file.
static const char kDefaultOutputFile[] = "test_detail";

// The environment variable name for the test shard index.
static const char kTestShardIndex[] = "GTEST_SHARD_INDEX";
// The environment variable name for the total number of test shards.
static const char kTestTotalShards[] = "GTEST_TOTAL_SHARDS";
// The environment variable name for the test shard status file.
static const char kTestShardStatusFile[] = "GTEST_SHARD_STATUS_FILE";

namespace internal {

// The text used in failure messages to indicate the start of the
// stack trace.
const char kStackTraceMarker[] = "\nStack trace:\n";

// g_help_flag is true if and only if the --help flag or an equivalent form
// is specified on the command line.
bool g_help_flag = false;

// Utilty function to Open File for Writing
static FILE* OpenFileForWriting(const std::string& output_file) {
 FILE* fileout = nullptr;
 FilePath output_file_path(output_file);
 FilePath output_dir(output_file_path.RemoveFileName());

 if (output_dir.CreateDirectoriesRecursively()) {
   fileout = posix::FOpen(output_file.c_str(), "w");
 }
 if (fileout == nullptr) {
   GTEST_LOG_(FATAL) << "Unable to open file \"" << output_file << "\"";
 }
 return fileout;
}

}  // namespace internal

// Bazel passes in the argument to '--test_filter' via the TESTBRIDGE_TEST_ONLY
// environment variable.
static const char* GetDefaultFilter() {
 const char* const testbridge_test_only =
     internal::posix::GetEnv("TESTBRIDGE_TEST_ONLY");
 if (testbridge_test_only != nullptr) {
   return testbridge_test_only;
 }
 return kUniversalFilter;
}

// Bazel passes in the argument to '--test_runner_fail_fast' via the
// TESTBRIDGE_TEST_RUNNER_FAIL_FAST environment variable.
static bool GetDefaultFailFast() {
 const char* const testbridge_test_runner_fail_fast =
     internal::posix::GetEnv("TESTBRIDGE_TEST_RUNNER_FAIL_FAST");
 if (testbridge_test_runner_fail_fast != nullptr) {
   return strcmp(testbridge_test_runner_fail_fast, "1") == 0;
 }
 return false;
}

GTEST_DEFINE_bool_(
   fail_fast, internal::BoolFromGTestEnv("fail_fast", GetDefaultFailFast()),
   "True if and only if a test failure should stop further test execution.");

GTEST_DEFINE_bool_(
   also_run_disabled_tests,
   internal::BoolFromGTestEnv("also_run_disabled_tests", false),
   "Run disabled tests too, in addition to the tests normally being run.");

GTEST_DEFINE_bool_(
   break_on_failure, internal::BoolFromGTestEnv("break_on_failure", false),
   "True if and only if a failed assertion should be a debugger "
   "break-point.");

GTEST_DEFINE_bool_(catch_exceptions,
                  internal::BoolFromGTestEnv("catch_exceptions", true),
                  "True if and only if " GTEST_NAME_
                  " should catch exceptions and treat them as test failures.");

GTEST_DEFINE_string_(
   color,
   internal::StringFromGTestEnv("color", "auto"),
   "Whether to use colors in the output.  Valid values: yes, no, "
   "and auto.  'auto' means to use colors if the output is "
   "being sent to a terminal and the TERM environment variable "
   "is set to a terminal type that supports colors.");

GTEST_DEFINE_string_(
   filter,
   internal::StringFromGTestEnv("filter", GetDefaultFilter()),
   "A colon-separated list of glob (not regex) patterns "
   "for filtering the tests to run, optionally followed by a "
   "'-' and a : separated list of negative patterns (tests to "
   "exclude).  A test is run if it matches one of the positive "
   "patterns and does not match any of the negative patterns.");

GTEST_DEFINE_bool_(
   install_failure_signal_handler,
   internal::BoolFromGTestEnv("install_failure_signal_handler", false),
   "If true and supported on the current platform, " GTEST_NAME_ " should "
   "install a signal handler that dumps debugging information when fatal "
   "signals are raised.");

GTEST_DEFINE_bool_(list_tests, false,
                  "List all tests without running them.");

// The net priority order after flag processing is thus:
//   --gtest_output command line flag
//   GTEST_OUTPUT environment variable
//   XML_OUTPUT_FILE environment variable
//   ''
GTEST_DEFINE_string_(
   output,
   internal::StringFromGTestEnv("output",
     internal::OutputFlagAlsoCheckEnvVar().c_str()),
   "A format (defaults to \"xml\" but can be specified to be \"json\"), "
   "optionally followed by a colon and an output file name or directory. "
   "A directory is indicated by a trailing pathname separator. "
   "Examples: \"xml:filename.xml\", \"xml::directoryname/\". "
   "If a directory is specified, output files will be created "
   "within that directory, with file-names based on the test "
   "executable's name and, if necessary, made unique by adding "
   "digits.");

GTEST_DEFINE_bool_(
   brief, internal::BoolFromGTestEnv("brief", false),
   "True if only test failures should be displayed in text output.");

GTEST_DEFINE_bool_(print_time, internal::BoolFromGTestEnv("print_time", true),
                  "True if and only if " GTEST_NAME_
                  " should display elapsed time in text output.");

GTEST_DEFINE_bool_(print_utf8, internal::BoolFromGTestEnv("print_utf8", true),
                  "True if and only if " GTEST_NAME_
                  " prints UTF8 characters as text.");

GTEST_DEFINE_int32_(
   random_seed,
   internal::Int32FromGTestEnv("random_seed", 0),
   "Random number seed to use when shuffling test orders.  Must be in range "
   "[1, 99999], or 0 to use a seed based on the current time.");

GTEST_DEFINE_int32_(
   repeat,
   internal::Int32FromGTestEnv("repeat", 1),
   "How many times to repeat each test.  Specify a negative number "
   "for repeating forever.  Useful for shaking out flaky tests.");

GTEST_DEFINE_bool_(show_internal_stack_frames, false,
                  "True if and only if " GTEST_NAME_
                  " should include internal stack frames when "
                  "printing test failure stack traces.");

GTEST_DEFINE_bool_(shuffle, internal::BoolFromGTestEnv("shuffle", false),
                  "True if and only if " GTEST_NAME_
                  " should randomize tests' order on every run.");

GTEST_DEFINE_int32_(
   stack_trace_depth,
   internal::Int32FromGTestEnv("stack_trace_depth", kMaxStackTraceDepth),
   "The maximum number of stack frames to print when an "
   "assertion fails.  The valid range is 0 through 100, inclusive.");

GTEST_DEFINE_string_(
   stream_result_to,
   internal::StringFromGTestEnv("stream_result_to", ""),
   "This flag specifies the host name and the port number on which to stream "
   "test results. Example: \"localhost:555\". The flag is effective only on "
   "Linux.");

GTEST_DEFINE_bool_(
   throw_on_failure,
   internal::BoolFromGTestEnv("throw_on_failure", false),
   "When this flag is specified, a failed assertion will throw an exception "
   "if exceptions are enabled or exit the program with a non-zero code "
   "otherwise. For use with an external test framework.");

#if GTEST_USE_OWN_FLAGFILE_FLAG_
GTEST_DEFINE_string_(
   flagfile,
   internal::StringFromGTestEnv("flagfile", ""),
   "This flag specifies the flagfile to read command-line flags from.");
#endif  // GTEST_USE_OWN_FLAGFILE_FLAG_

namespace internal {

// Generates a random number from [0, range), using a Linear
// Congruential Generator (LCG).  Crashes if 'range' is 0 or greater
// than kMaxRange.
uint32_t Random::Generate(uint32_t range) {
 // These constants are the same as are used in glibc's rand(3).
 // Use wider types than necessary to prevent unsigned overflow diagnostics.
 state_ = static_cast<uint32_t>(1103515245ULL*state_ + 12345U) % kMaxRange;

 GTEST_CHECK_(range > 0)
     << "Cannot generate a number in the range [0, 0).";
 GTEST_CHECK_(range <= kMaxRange)
     << "Generation of a number in [0, " << range << ") was requested, "
     << "but this can only generate numbers in [0, " << kMaxRange << ").";

 // Converting via modulus introduces a bit of downward bias, but
 // it's simple, and a linear congruential generator isn't too good
 // to begin with.
 return state_ % range;
}

// GTestIsInitialized() returns true if and only if the user has initialized
// Google Test.  Useful for catching the user mistake of not initializing
// Google Test before calling RUN_ALL_TESTS().
static bool GTestIsInitialized() { return GetArgvs().size() > 0; }

// Iterates over a vector of TestSuites, keeping a running sum of the
// results of calling a given int-returning method on each.
// Returns the sum.
static int SumOverTestSuiteList(const std::vector<TestSuite*>& case_list,
                               int (TestSuite::*method)() const) {
 int sum = 0;
 for (size_t i = 0; i < case_list.size(); i++) {
   sum += (case_list[i]->*method)();
 }
 return sum;
}

// Returns true if and only if the test suite passed.
static bool TestSuitePassed(const TestSuite* test_suite) {
 return test_suite->should_run() && test_suite->Passed();
}

// Returns true if and only if the test suite failed.
static bool TestSuiteFailed(const TestSuite* test_suite) {
 return test_suite->should_run() && test_suite->Failed();
}

// Returns true if and only if test_suite contains at least one test that
// should run.
static bool ShouldRunTestSuite(const TestSuite* test_suite) {
 return test_suite->should_run();
}

// AssertHelper constructor.
AssertHelper::AssertHelper(TestPartResult::Type type,
                          const char* file,
                          int line,
                          const char* message)
   : data_(new AssertHelperData(type, file, line, message)) {
}

AssertHelper::~AssertHelper() {
 delete data_;
}

// Message assignment, for assertion streaming support.
void AssertHelper::operator=(const Message& message) const {
 UnitTest::GetInstance()->
   AddTestPartResult(data_->type, data_->file, data_->line,
                     AppendUserMessage(data_->message, message),
                     UnitTest::GetInstance()->impl()
                     ->CurrentOsStackTraceExceptTop(1)
                     // Skips the stack frame for this function itself.
                     );  // NOLINT
}

namespace {

// When TEST_P is found without a matching INSTANTIATE_TEST_SUITE_P
// to creates test cases for it, a syntetic test case is
// inserted to report ether an error or a log message.
//
// This configuration bit will likely be removed at some point.
constexpr bool kErrorOnUninstantiatedParameterizedTest = true;
constexpr bool kErrorOnUninstantiatedTypeParameterizedTest = true;

// A test that fails at a given file/line location with a given message.
class FailureTest : public Test {
public:
 explicit FailureTest(const CodeLocation& loc, std::string error_message,
                      bool as_error)
     : loc_(loc),
       error_message_(std::move(error_message)),
       as_error_(as_error) {}

 void TestBody() override {
   if (as_error_) {
     AssertHelper(TestPartResult::kNonFatalFailure, loc_.file.c_str(),
                  loc_.line, "") = Message() << error_message_;
   } else {
     std::cout << error_message_ << std::endl;
   }
 }

private:
 const CodeLocation loc_;
 const std::string error_message_;
 const bool as_error_;
};


}  // namespace

std::set<std::string>* GetIgnoredParameterizedTestSuites() {
 return UnitTest::GetInstance()->impl()->ignored_parameterized_test_suites();
}

// Add a given test_suit to the list of them allow to go un-instantiated.
MarkAsIgnored::MarkAsIgnored(const char* test_suite) {
 GetIgnoredParameterizedTestSuites()->insert(test_suite);
}

// If this parameterized test suite has no instantiations (and that
// has not been marked as okay), emit a test case reporting that.
void InsertSyntheticTestCase(const std::string& name, CodeLocation location,
                            bool has_test_p) {
 const auto& ignored = *GetIgnoredParameterizedTestSuites();
 if (ignored.find(name) != ignored.end()) return;

 const char kMissingInstantiation[] =  //
     " is defined via TEST_P, but never instantiated. None of the test cases "
     "will run. Either no INSTANTIATE_TEST_SUITE_P is provided or the only "
     "ones provided expand to nothing."
     "\n\n"
     "Ideally, TEST_P definitions should only ever be included as part of "
     "binaries that intend to use them. (As opposed to, for example, being "
     "placed in a library that may be linked in to get other utilities.)";

 const char kMissingTestCase[] =  //
     " is instantiated via INSTANTIATE_TEST_SUITE_P, but no tests are "
     "defined via TEST_P . No test cases will run."
     "\n\n"
     "Ideally, INSTANTIATE_TEST_SUITE_P should only ever be invoked from "
     "code that always depend on code that provides TEST_P. Failing to do "
     "so is often an indication of dead code, e.g. the last TEST_P was "
     "removed but the rest got left behind.";

 std::string message =
     "Parameterized test suite " + name +
     (has_test_p ? kMissingInstantiation : kMissingTestCase) +
     "\n\n"
     "To suppress this error for this test suite, insert the following line "
     "(in a non-header) in the namespace it is defined in:"
     "\n\n"
     "GTEST_ALLOW_UNINSTANTIATED_PARAMETERIZED_TEST(" + name + ");";

 std::string full_name = "UninstantiatedParameterizedTestSuite<" + name + ">";
 RegisterTest(  //
     "GoogleTestVerification", full_name.c_str(),
     nullptr,  // No type parameter.
     nullptr,  // No value parameter.
     location.file.c_str(), location.line, [message, location] {
       return new FailureTest(location, message,
                              kErrorOnUninstantiatedParameterizedTest);
     });
}

void RegisterTypeParameterizedTestSuite(const char* test_suite_name,
                                       CodeLocation code_location) {
 GetUnitTestImpl()->type_parameterized_test_registry().RegisterTestSuite(
     test_suite_name, code_location);
}

void RegisterTypeParameterizedTestSuiteInstantiation(const char* case_name) {
 GetUnitTestImpl()
     ->type_parameterized_test_registry()
     .RegisterInstantiation(case_name);
}

void TypeParameterizedTestSuiteRegistry::RegisterTestSuite(
   const char* test_suite_name, CodeLocation code_location) {
 suites_.emplace(std::string(test_suite_name),
                TypeParameterizedTestSuiteInfo(code_location));
}

void TypeParameterizedTestSuiteRegistry::RegisterInstantiation(
       const char* test_suite_name) {
 auto it = suites_.find(std::string(test_suite_name));
 if (it != suites_.end()) {
   it->second.instantiated = true;
 } else {
   GTEST_LOG_(ERROR) << "Unknown type parameterized test suit '"
                     << test_suite_name << "'";
 }
}

void TypeParameterizedTestSuiteRegistry::CheckForInstantiations() {
 const auto& ignored = *GetIgnoredParameterizedTestSuites();
 for (const auto& testcase : suites_) {
   if (testcase.second.instantiated) continue;
   if (ignored.find(testcase.first) != ignored.end()) continue;

   std::string message =
       "Type parameterized test suite " + testcase.first +
       " is defined via REGISTER_TYPED_TEST_SUITE_P, but never instantiated "
       "via INSTANTIATE_TYPED_TEST_SUITE_P. None of the test cases will run."
       "\n\n"
       "Ideally, TYPED_TEST_P definitions should only ever be included as "
       "part of binaries that intend to use them. (As opposed to, for "
       "example, being placed in a library that may be linked in to get other "
       "utilities.)"
       "\n\n"
       "To suppress this error for this test suite, insert the following line "
       "(in a non-header) in the namespace it is defined in:"
       "\n\n"
       "GTEST_ALLOW_UNINSTANTIATED_PARAMETERIZED_TEST(" +
       testcase.first + ");";

   std::string full_name =
       "UninstantiatedTypeParameterizedTestSuite<" + testcase.first + ">";
   RegisterTest(  //
       "GoogleTestVerification", full_name.c_str(),
       nullptr,  // No type parameter.
       nullptr,  // No value parameter.
       testcase.second.code_location.file.c_str(),
       testcase.second.code_location.line, [message, testcase] {
         return new FailureTest(testcase.second.code_location, message,
                                kErrorOnUninstantiatedTypeParameterizedTest);
       });
 }
}

// A copy of all command line arguments.  Set by InitGoogleTest().
static ::std::vector<std::string> g_argvs;

::std::vector<std::string> GetArgvs() {
#if defined(GTEST_CUSTOM_GET_ARGVS_)
 // GTEST_CUSTOM_GET_ARGVS_() may return a container of std::string or
 // ::string. This code converts it to the appropriate type.
 const auto& custom = GTEST_CUSTOM_GET_ARGVS_();
 return ::std::vector<std::string>(custom.begin(), custom.end());
#else   // defined(GTEST_CUSTOM_GET_ARGVS_)
 return g_argvs;
#endif  // defined(GTEST_CUSTOM_GET_ARGVS_)
}

// Returns the current application's name, removing directory path if that
// is present.
FilePath GetCurrentExecutableName() {
 FilePath result;

#if GTEST_OS_WINDOWS || GTEST_OS_OS2
 result.Set(FilePath(GetArgvs()[0]).RemoveExtension("exe"));
#else
 result.Set(FilePath(GetArgvs()[0]));
#endif  // GTEST_OS_WINDOWS

 return result.RemoveDirectoryName();
}

// Functions for processing the gtest_output flag.

// Returns the output format, or "" for normal printed output.
std::string UnitTestOptions::GetOutputFormat() {
 const char* const gtest_output_flag = GTEST_FLAG(output).c_str();
 const char* const colon = strchr(gtest_output_flag, ':');
 return (colon == nullptr)
            ? std::string(gtest_output_flag)
            : std::string(gtest_output_flag,
                          static_cast<size_t>(colon - gtest_output_flag));
}

// Returns the name of the requested output file, or the default if none
// was explicitly specified.
std::string UnitTestOptions::GetAbsolutePathToOutputFile() {
 const char* const gtest_output_flag = GTEST_FLAG(output).c_str();

 std::string format = GetOutputFormat();
 if (format.empty())
   format = std::string(kDefaultOutputFormat);

 const char* const colon = strchr(gtest_output_flag, ':');
 if (colon == nullptr)
   return internal::FilePath::MakeFileName(
       internal::FilePath(
           UnitTest::GetInstance()->original_working_dir()),
       internal::FilePath(kDefaultOutputFile), 0,
       format.c_str()).string();

 internal::FilePath output_name(colon + 1);
 if (!output_name.IsAbsolutePath())
   output_name = internal::FilePath::ConcatPaths(
       internal::FilePath(UnitTest::GetInstance()->original_working_dir()),
       internal::FilePath(colon + 1));

 if (!output_name.IsDirectory())
   return output_name.string();

 internal::FilePath result(internal::FilePath::GenerateUniqueFileName(
     output_name, internal::GetCurrentExecutableName(),
     GetOutputFormat().c_str()));
 return result.string();
}

// Returns true if and only if the wildcard pattern matches the string. Each
// pattern consists of regular characters, single-character wildcards (?), and
// multi-character wildcards (*).
//
// This function implements a linear-time string globbing algorithm based on
// https://research.swtch.com/glob.
static bool PatternMatchesString(const std::string& name_str,
                                const char* pattern, const char* pattern_end) {
 const char* name = name_str.c_str();
 const char* const name_begin = name;
 const char* const name_end = name + name_str.size();

 const char* pattern_next = pattern;
 const char* name_next = name;

 while (pattern < pattern_end || name < name_end) {
   if (pattern < pattern_end) {
     switch (*pattern) {
       default:  // Match an ordinary character.
         if (name < name_end && *name == *pattern) {
           ++pattern;
           ++name;
           continue;
         }
         break;
       case '?':  // Match any single character.
         if (name < name_end) {
           ++pattern;
           ++name;
           continue;
         }
         break;
       case '*':
         // Match zero or more characters. Start by skipping over the wildcard
         // and matching zero characters from name. If that fails, restart and
         // match one more character than the last attempt.
         pattern_next = pattern;
         name_next = name + 1;
         ++pattern;
         continue;
     }
   }
   // Failed to match a character. Restart if possible.
   if (name_begin < name_next && name_next <= name_end) {
     pattern = pattern_next;
     name = name_next;
     continue;
   }
   return false;
 }
 return true;
}

bool UnitTestOptions::MatchesFilter(const std::string& name_str,
                                   const char* filter) {
 // The filter is a list of patterns separated by colons (:).
 const char* pattern = filter;
 while (true) {
   // Find the bounds of this pattern.
   const char* const next_sep = strchr(pattern, ':');
   const char* const pattern_end =
       next_sep != nullptr ? next_sep : pattern + strlen(pattern);

   // Check if this pattern matches name_str.
   if (PatternMatchesString(name_str, pattern, pattern_end)) {
     return true;
   }

   // Give up on this pattern. However, if we found a pattern separator (:),
   // advance to the next pattern (skipping over the separator) and restart.
   if (next_sep == nullptr) {
     return false;
   }
   pattern = next_sep + 1;
 }
 return true;
}

// Returns true if and only if the user-specified filter matches the test
// suite name and the test name.
bool UnitTestOptions::FilterMatchesTest(const std::string& test_suite_name,
                                       const std::string& test_name) {
 const std::string& full_name = test_suite_name + "." + test_name.c_str();

 // Split --gtest_filter at '-', if there is one, to separate into
 // positive filter and negative filter portions
 const char* const p = GTEST_FLAG(filter).c_str();
 const char* const dash = strchr(p, '-');
 std::string positive;
 std::string negative;
 if (dash == nullptr) {
   positive = GTEST_FLAG(filter).c_str();  // Whole string is a positive filter
   negative = "";
 } else {
   positive = std::string(p, dash);   // Everything up to the dash
   negative = std::string(dash + 1);  // Everything after the dash
   if (positive.empty()) {
     // Treat '-test1' as the same as '*-test1'
     positive = kUniversalFilter;
   }
 }

 // A filter is a colon-separated list of patterns.  It matches a
 // test if any pattern in it matches the test.
 return (MatchesFilter(full_name, positive.c_str()) &&
         !MatchesFilter(full_name, negative.c_str()));
}

#if GTEST_HAS_SEH
// Returns EXCEPTION_EXECUTE_HANDLER if Google Test should handle the
// given SEH exception, or EXCEPTION_CONTINUE_SEARCH otherwise.
// This function is useful as an __except condition.
int UnitTestOptions::GTestShouldProcessSEH(DWORD exception_code) {
 // Google Test should handle a SEH exception if:
 //   1. the user wants it to, AND
 //   2. this is not a breakpoint exception, AND
 //   3. this is not a C++ exception (VC++ implements them via SEH,
 //      apparently).
 //
 // SEH exception code for C++ exceptions.
 // (see http://support.microsoft.com/kb/185294 for more information).
 const DWORD kCxxExceptionCode = 0xe06d7363;

 bool should_handle = true;

 if (!GTEST_FLAG(catch_exceptions))
   should_handle = false;
 else if (exception_code == EXCEPTION_BREAKPOINT)
   should_handle = false;
 else if (exception_code == kCxxExceptionCode)
   should_handle = false;

 return should_handle ? EXCEPTION_EXECUTE_HANDLER : EXCEPTION_CONTINUE_SEARCH;
}
#endif  // GTEST_HAS_SEH

}  // namespace internal

// The c'tor sets this object as the test part result reporter used by
// Google Test.  The 'result' parameter specifies where to report the
// results. Intercepts only failures from the current thread.
ScopedFakeTestPartResultReporter::ScopedFakeTestPartResultReporter(
   TestPartResultArray* result)
   : intercept_mode_(INTERCEPT_ONLY_CURRENT_THREAD),
     result_(result) {
 Init();
}

// The c'tor sets this object as the test part result reporter used by
// Google Test.  The 'result' parameter specifies where to report the
// results.
ScopedFakeTestPartResultReporter::ScopedFakeTestPartResultReporter(
   InterceptMode intercept_mode, TestPartResultArray* result)
   : intercept_mode_(intercept_mode),
     result_(result) {
 Init();
}

void ScopedFakeTestPartResultReporter::Init() {
 internal::UnitTestImpl* const impl = internal::GetUnitTestImpl();
 if (intercept_mode_ == INTERCEPT_ALL_THREADS) {
   old_reporter_ = impl->GetGlobalTestPartResultReporter();
   impl->SetGlobalTestPartResultReporter(this);
 } else {
   old_reporter_ = impl->GetTestPartResultReporterForCurrentThread();
   impl->SetTestPartResultReporterForCurrentThread(this);
 }
}

// The d'tor restores the test part result reporter used by Google Test
// before.
ScopedFakeTestPartResultReporter::~ScopedFakeTestPartResultReporter() {
 internal::UnitTestImpl* const impl = internal::GetUnitTestImpl();
 if (intercept_mode_ == INTERCEPT_ALL_THREADS) {
   impl->SetGlobalTestPartResultReporter(old_reporter_);
 } else {
   impl->SetTestPartResultReporterForCurrentThread(old_reporter_);
 }
}

// Increments the test part result count and remembers the result.
// This method is from the TestPartResultReporterInterface interface.
void ScopedFakeTestPartResultReporter::ReportTestPartResult(
   const TestPartResult& result) {
 result_->Append(result);
}

namespace internal {

// Returns the type ID of ::testing::Test.  We should always call this
// instead of GetTypeId< ::testing::Test>() to get the type ID of
// testing::Test.  This is to work around a suspected linker bug when
// using Google Test as a framework on Mac OS X.  The bug causes
// GetTypeId< ::testing::Test>() to return different values depending
// on whether the call is from the Google Test framework itself or
// from user test code.  GetTestTypeId() is guaranteed to always
// return the same value, as it always calls GetTypeId<>() from the
// gtest.cc, which is within the Google Test framework.
TypeId GetTestTypeId() {
 return GetTypeId<Test>();
}

// The value of GetTestTypeId() as seen from within the Google Test
// library.  This is solely for testing GetTestTypeId().
extern const TypeId kTestTypeIdInGoogleTest = GetTestTypeId();

// This predicate-formatter checks that 'results' contains a test part
// failure of the given type and that the failure message contains the
// given substring.
static AssertionResult HasOneFailure(const char* /* results_expr */,
                                    const char* /* type_expr */,
                                    const char* /* substr_expr */,
                                    const TestPartResultArray& results,
                                    TestPartResult::Type type,
                                    const std::string& substr) {
 const std::string expected(type == TestPartResult::kFatalFailure ?
                       "1 fatal failure" :
                       "1 non-fatal failure");
 Message msg;
 if (results.size() != 1) {
   msg << "Expected: " << expected << "\n"
       << "  Actual: " << results.size() << " failures";
   for (int i = 0; i < results.size(); i++) {
     msg << "\n" << results.GetTestPartResult(i);
   }
   return AssertionFailure() << msg;
 }

 const TestPartResult& r = results.GetTestPartResult(0);
 if (r.type() != type) {
   return AssertionFailure() << "Expected: " << expected << "\n"
                             << "  Actual:\n"
                             << r;
 }

 if (strstr(r.message(), substr.c_str()) == nullptr) {
   return AssertionFailure() << "Expected: " << expected << " containing \""
                             << substr << "\"\n"
                             << "  Actual:\n"
                             << r;
 }

 return AssertionSuccess();
}

// The constructor of SingleFailureChecker remembers where to look up
// test part results, what type of failure we expect, and what
// substring the failure message should contain.
SingleFailureChecker::SingleFailureChecker(const TestPartResultArray* results,
                                          TestPartResult::Type type,
                                          const std::string& substr)
   : results_(results), type_(type), substr_(substr) {}

// The destructor of SingleFailureChecker verifies that the given
// TestPartResultArray contains exactly one failure that has the given
// type and contains the given substring.  If that's not the case, a
// non-fatal failure will be generated.
SingleFailureChecker::~SingleFailureChecker() {
 EXPECT_PRED_FORMAT3(HasOneFailure, *results_, type_, substr_);
}

DefaultGlobalTestPartResultReporter::DefaultGlobalTestPartResultReporter(
   UnitTestImpl* unit_test) : unit_test_(unit_test) {}

void DefaultGlobalTestPartResultReporter::ReportTestPartResult(
   const TestPartResult& result) {
 unit_test_->current_test_result()->AddTestPartResult(result);
 unit_test_->listeners()->repeater()->OnTestPartResult(result);
}

DefaultPerThreadTestPartResultReporter::DefaultPerThreadTestPartResultReporter(
   UnitTestImpl* unit_test) : unit_test_(unit_test) {}

void DefaultPerThreadTestPartResultReporter::ReportTestPartResult(
   const TestPartResult& result) {
 unit_test_->GetGlobalTestPartResultReporter()->ReportTestPartResult(result);
}

// Returns the global test part result reporter.
TestPartResultReporterInterface*
UnitTestImpl::GetGlobalTestPartResultReporter() {
 internal::MutexLock lock(&global_test_part_result_reporter_mutex_);
 return global_test_part_result_repoter_;
}

// Sets the global test part result reporter.
void UnitTestImpl::SetGlobalTestPartResultReporter(
   TestPartResultReporterInterface* reporter) {
 internal::MutexLock lock(&global_test_part_result_reporter_mutex_);
 global_test_part_result_repoter_ = reporter;
}

// Returns the test part result reporter for the current thread.
TestPartResultReporterInterface*
UnitTestImpl::GetTestPartResultReporterForCurrentThread() {
 return per_thread_test_part_result_reporter_.get();
}

// Sets the test part result reporter for the current thread.
void UnitTestImpl::SetTestPartResultReporterForCurrentThread(
   TestPartResultReporterInterface* reporter) {
 per_thread_test_part_result_reporter_.set(reporter);
}

// Gets the number of successful test suites.
int UnitTestImpl::successful_test_suite_count() const {
 return CountIf(test_suites_, TestSuitePassed);
}

// Gets the number of failed test suites.
int UnitTestImpl::failed_test_suite_count() const {
 return CountIf(test_suites_, TestSuiteFailed);
}

// Gets the number of all test suites.
int UnitTestImpl::total_test_suite_count() const {
 return static_cast<int>(test_suites_.size());
}

// Gets the number of all test suites that contain at least one test
// that should run.
int UnitTestImpl::test_suite_to_run_count() const {
 return CountIf(test_suites_, ShouldRunTestSuite);
}

// Gets the number of successful tests.
int UnitTestImpl::successful_test_count() const {
 return SumOverTestSuiteList(test_suites_, &TestSuite::successful_test_count);
}

// Gets the number of skipped tests.
int UnitTestImpl::skipped_test_count() const {
 return SumOverTestSuiteList(test_suites_, &TestSuite::skipped_test_count);
}

// Gets the number of failed tests.
int UnitTestImpl::failed_test_count() const {
 return SumOverTestSuiteList(test_suites_, &TestSuite::failed_test_count);
}

// Gets the number of disabled tests that will be reported in the XML report.
int UnitTestImpl::reportable_disabled_test_count() const {
 return SumOverTestSuiteList(test_suites_,
                             &TestSuite::reportable_disabled_test_count);
}

// Gets the number of disabled tests.
int UnitTestImpl::disabled_test_count() const {
 return SumOverTestSuiteList(test_suites_, &TestSuite::disabled_test_count);
}

// Gets the number of tests to be printed in the XML report.
int UnitTestImpl::reportable_test_count() const {
 return SumOverTestSuiteList(test_suites_, &TestSuite::reportable_test_count);
}

// Gets the number of all tests.
int UnitTestImpl::total_test_count() const {
 return SumOverTestSuiteList(test_suites_, &TestSuite::total_test_count);
}

// Gets the number of tests that should run.
int UnitTestImpl::test_to_run_count() const {
 return SumOverTestSuiteList(test_suites_, &TestSuite::test_to_run_count);
}

// Returns the current OS stack trace as an std::string.
//
// The maximum number of stack frames to be included is specified by
// the gtest_stack_trace_depth flag.  The skip_count parameter
// specifies the number of top frames to be skipped, which doesn't
// count against the number of frames to be included.
//
// For example, if Foo() calls Bar(), which in turn calls
// CurrentOsStackTraceExceptTop(1), Foo() will be included in the
// trace but Bar() and CurrentOsStackTraceExceptTop() won't.
std::string UnitTestImpl::CurrentOsStackTraceExceptTop(int skip_count) {
 return os_stack_trace_getter()->CurrentStackTrace(
     static_cast<int>(GTEST_FLAG(stack_trace_depth)),
     skip_count + 1
     // Skips the user-specified number of frames plus this function
     // itself.
     );  // NOLINT
}

// A helper class for measuring elapsed times.
class Timer {
public:
 Timer() : start_(std::chrono::steady_clock::now()) {}

 // Return time elapsed in milliseconds since the timer was created.
 TimeInMillis Elapsed() {
   return std::chrono::duration_cast<std::chrono::milliseconds>(
              std::chrono::steady_clock::now() - start_)
       .count();
 }

private:
 std::chrono::steady_clock::time_point start_;
};

// Returns a timestamp as milliseconds since the epoch. Note this time may jump
// around subject to adjustments by the system, to measure elapsed time use
// Timer instead.
TimeInMillis GetTimeInMillis() {
 return std::chrono::duration_cast<std::chrono::milliseconds>(
            std::chrono::system_clock::now() -
            std::chrono::system_clock::from_time_t(0))
     .count();
}

// Utilities

// class String.

#if GTEST_OS_WINDOWS_MOBILE
// Creates a UTF-16 wide string from the given ANSI string, allocating
// memory using new. The caller is responsible for deleting the return
// value using delete[]. Returns the wide string, or NULL if the
// input is NULL.
LPCWSTR String::AnsiToUtf16(const char* ansi) {
 if (!ansi) return nullptr;
 const int length = strlen(ansi);
 const int unicode_length =
     MultiByteToWideChar(CP_ACP, 0, ansi, length, nullptr, 0);
 WCHAR* unicode = new WCHAR[unicode_length + 1];
 MultiByteToWideChar(CP_ACP, 0, ansi, length,
                     unicode, unicode_length);
 unicode[unicode_length] = 0;
 return unicode;
}

// Creates an ANSI string from the given wide string, allocating
// memory using new. The caller is responsible for deleting the return
// value using delete[]. Returns the ANSI string, or NULL if the
// input is NULL.
const char* String::Utf16ToAnsi(LPCWSTR utf16_str)  {
 if (!utf16_str) return nullptr;
 const int ansi_length = WideCharToMultiByte(CP_ACP, 0, utf16_str, -1, nullptr,
                                             0, nullptr, nullptr);
 char* ansi = new char[ansi_length + 1];
 WideCharToMultiByte(CP_ACP, 0, utf16_str, -1, ansi, ansi_length, nullptr,
                     nullptr);
 ansi[ansi_length] = 0;
 return ansi;
}

#endif  // GTEST_OS_WINDOWS_MOBILE

// Compares two C strings.  Returns true if and only if they have the same
// content.
//
// Unlike strcmp(), this function can handle NULL argument(s).  A NULL
// C string is considered different to any non-NULL C string,
// including the empty string.
bool String::CStringEquals(const char * lhs, const char * rhs) {
 if (lhs == nullptr) return rhs == nullptr;

 if (rhs == nullptr) return false;

 return strcmp(lhs, rhs) == 0;
}

#if GTEST_HAS_STD_WSTRING

// Converts an array of wide chars to a narrow string using the UTF-8
// encoding, and streams the result to the given Message object.
static void StreamWideCharsToMessage(const wchar_t* wstr, size_t length,
                                    Message* msg) {
 for (size_t i = 0; i != length; ) {  // NOLINT
   if (wstr[i] != L'\0') {
     *msg << WideStringToUtf8(wstr + i, static_cast<int>(length - i));
     while (i != length && wstr[i] != L'\0')
       i++;
   } else {
     *msg << '\0';
     i++;
   }
 }
}

#endif  // GTEST_HAS_STD_WSTRING

void SplitString(const ::std::string& str, char delimiter,
                ::std::vector< ::std::string>* dest) {
 ::std::vector< ::std::string> parsed;
 ::std::string::size_type pos = 0;
 while (::testing::internal::AlwaysTrue()) {
   const ::std::string::size_type colon = str.find(delimiter, pos);
   if (colon == ::std::string::npos) {
     parsed.push_back(str.substr(pos));
     break;
   } else {
     parsed.push_back(str.substr(pos, colon - pos));
     pos = colon + 1;
   }
 }
 dest->swap(parsed);
}

}  // namespace internal

// Constructs an empty Message.
// We allocate the stringstream separately because otherwise each use of
// ASSERT/EXPECT in a procedure adds over 200 bytes to the procedure's
// stack frame leading to huge stack frames in some cases; gcc does not reuse
// the stack space.
Message::Message() : ss_(new ::std::stringstream) {
 // By default, we want there to be enough precision when printing
 // a double to a Message.
 *ss_ << std::setprecision(std::numeric_limits<double>::digits10 + 2);
}

// These two overloads allow streaming a wide C string to a Message
// using the UTF-8 encoding.
Message& Message::operator <<(const wchar_t* wide_c_str) {
 return *this << internal::String::ShowWideCString(wide_c_str);
}
Message& Message::operator <<(wchar_t* wide_c_str) {
 return *this << internal::String::ShowWideCString(wide_c_str);
}

#if GTEST_HAS_STD_WSTRING
// Converts the given wide string to a narrow string using the UTF-8
// encoding, and streams the result to this Message object.
Message& Message::operator <<(const ::std::wstring& wstr) {
 internal::StreamWideCharsToMessage(wstr.c_str(), wstr.length(), this);
 return *this;
}
#endif  // GTEST_HAS_STD_WSTRING

// Gets the text streamed to this object so far as an std::string.
// Each '\0' character in the buffer is replaced with "\\0".
std::string Message::GetString() const {
 return internal::StringStreamToString(ss_.get());
}

// AssertionResult constructors.
// Used in EXPECT_TRUE/FALSE(assertion_result).
AssertionResult::AssertionResult(const AssertionResult& other)
   : success_(other.success_),
     message_(other.message_.get() != nullptr
                  ? new ::std::string(*other.message_)
                  : static_cast< ::std::string*>(nullptr)) {}

// Swaps two AssertionResults.
void AssertionResult::swap(AssertionResult& other) {
 using std::swap;
 swap(success_, other.success_);
 swap(message_, other.message_);
}

// Returns the assertion's negation. Used with EXPECT/ASSERT_FALSE.
AssertionResult AssertionResult::operator!() const {
 AssertionResult negation(!success_);
 if (message_.get() != nullptr) negation << *message_;
 return negation;
}

// Makes a successful assertion result.
AssertionResult AssertionSuccess() {
 return AssertionResult(true);
}

// Makes a failed assertion result.
AssertionResult AssertionFailure() {
 return AssertionResult(false);
}

// Makes a failed assertion result with the given failure message.
// Deprecated; use AssertionFailure() << message.
AssertionResult AssertionFailure(const Message& message) {
 return AssertionFailure() << message;
}

namespace internal {

namespace edit_distance {
std::vector<EditType> CalculateOptimalEdits(const std::vector<size_t>& left,
                                           const std::vector<size_t>& right) {
 std::vector<std::vector<double> > costs(
     left.size() + 1, std::vector<double>(right.size() + 1));
 std::vector<std::vector<EditType> > best_move(
     left.size() + 1, std::vector<EditType>(right.size() + 1));

 // Populate for empty right.
 for (size_t l_i = 0; l_i < costs.size(); ++l_i) {
   costs[l_i][0] = static_cast<double>(l_i);
   best_move[l_i][0] = kRemove;
 }
 // Populate for empty left.
 for (size_t r_i = 1; r_i < costs[0].size(); ++r_i) {
   costs[0][r_i] = static_cast<double>(r_i);
   best_move[0][r_i] = kAdd;
 }

 for (size_t l_i = 0; l_i < left.size(); ++l_i) {
   for (size_t r_i = 0; r_i < right.size(); ++r_i) {
     if (left[l_i] == right[r_i]) {
       // Found a match. Consume it.
       costs[l_i + 1][r_i + 1] = costs[l_i][r_i];
       best_move[l_i + 1][r_i + 1] = kMatch;
       continue;
     }

     const double add = costs[l_i + 1][r_i];
     const double remove = costs[l_i][r_i + 1];
     const double replace = costs[l_i][r_i];
     if (add < remove && add < replace) {
       costs[l_i + 1][r_i + 1] = add + 1;
       best_move[l_i + 1][r_i + 1] = kAdd;
     } else if (remove < add && remove < replace) {
       costs[l_i + 1][r_i + 1] = remove + 1;
       best_move[l_i + 1][r_i + 1] = kRemove;
     } else {
       // We make replace a little more expensive than add/remove to lower
       // their priority.
       costs[l_i + 1][r_i + 1] = replace + 1.00001;
       best_move[l_i + 1][r_i + 1] = kReplace;
     }
   }
 }

 // Reconstruct the best path. We do it in reverse order.
 std::vector<EditType> best_path;
 for (size_t l_i = left.size(), r_i = right.size(); l_i > 0 || r_i > 0;) {
   EditType move = best_move[l_i][r_i];
   best_path.push_back(move);
   l_i -= move != kAdd;
   r_i -= move != kRemove;
 }
 std::reverse(best_path.begin(), best_path.end());
 return best_path;
}

namespace {

// Helper class to convert string into ids with deduplication.
class InternalStrings {
public:
 size_t GetId(const std::string& str) {
   IdMap::iterator it = ids_.find(str);
   if (it != ids_.end()) return it->second;
   size_t id = ids_.size();
   return ids_[str] = id;
 }

private:
 typedef std::map<std::string, size_t> IdMap;
 IdMap ids_;
};

}  // namespace

std::vector<EditType> CalculateOptimalEdits(
   const std::vector<std::string>& left,
   const std::vector<std::string>& right) {
 std::vector<size_t> left_ids, right_ids;
 {
   InternalStrings intern_table;
   for (size_t i = 0; i < left.size(); ++i) {
     left_ids.push_back(intern_table.GetId(left[i]));
   }
   for (size_t i = 0; i < right.size(); ++i) {
     right_ids.push_back(intern_table.GetId(right[i]));
   }
 }
 return CalculateOptimalEdits(left_ids, right_ids);
}

namespace {

// Helper class that holds the state for one hunk and prints it out to the
// stream.
// It reorders adds/removes when possible to group all removes before all
// adds. It also adds the hunk header before printint into the stream.
class Hunk {
public:
 Hunk(size_t left_start, size_t right_start)
     : left_start_(left_start),
       right_start_(right_start),
       adds_(),
       removes_(),
       common_() {}

 void PushLine(char edit, const char* line) {
   switch (edit) {
     case ' ':
       ++common_;
       FlushEdits();
       hunk_.push_back(std::make_pair(' ', line));
       break;
     case '-':
       ++removes_;
       hunk_removes_.push_back(std::make_pair('-', line));
       break;
     case '+':
       ++adds_;
       hunk_adds_.push_back(std::make_pair('+', line));
       break;
   }
 }

 void PrintTo(std::ostream* os) {
   PrintHeader(os);
   FlushEdits();
   for (std::list<std::pair<char, const char*> >::const_iterator it =
            hunk_.begin();
        it != hunk_.end(); ++it) {
     *os << it->first << it->second << "\n";
   }
 }

 bool has_edits() const { return adds_ || removes_; }

private:
 void FlushEdits() {
   hunk_.splice(hunk_.end(), hunk_removes_);
   hunk_.splice(hunk_.end(), hunk_adds_);
 }

 // Print a unified diff header for one hunk.
 // The format is
 //   "@@ -<left_start>,<left_length> +<right_start>,<right_length> @@"
 // where the left/right parts are omitted if unnecessary.
 void PrintHeader(std::ostream* ss) const {
   *ss << "@@ ";
   if (removes_) {
     *ss << "-" << left_start_ << "," << (removes_ + common_);
   }
   if (removes_ && adds_) {
     *ss << " ";
   }
   if (adds_) {
     *ss << "+" << right_start_ << "," << (adds_ + common_);
   }
   *ss << " @@\n";
 }

 size_t left_start_, right_start_;
 size_t adds_, removes_, common_;
 std::list<std::pair<char, const char*> > hunk_, hunk_adds_, hunk_removes_;
};

}  // namespace

// Create a list of diff hunks in Unified diff format.
// Each hunk has a header generated by PrintHeader above plus a body with
// lines prefixed with ' ' for no change, '-' for deletion and '+' for
// addition.
// 'context' represents the desired unchanged prefix/suffix around the diff.
// If two hunks are close enough that their contexts overlap, then they are
// joined into one hunk.
std::string CreateUnifiedDiff(const std::vector<std::string>& left,
                             const std::vector<std::string>& right,
                             size_t context) {
 const std::vector<EditType> edits = CalculateOptimalEdits(left, right);

 size_t l_i = 0, r_i = 0, edit_i = 0;
 std::stringstream ss;
 while (edit_i < edits.size()) {
   // Find first edit.
   while (edit_i < edits.size() && edits[edit_i] == kMatch) {
     ++l_i;
     ++r_i;
     ++edit_i;
   }

   // Find the first line to include in the hunk.
   const size_t prefix_context = std::min(l_i, context);
   Hunk hunk(l_i - prefix_context + 1, r_i - prefix_context + 1);
   for (size_t i = prefix_context; i > 0; --i) {
     hunk.PushLine(' ', left[l_i - i].c_str());
   }

   // Iterate the edits until we found enough suffix for the hunk or the input
   // is over.
   size_t n_suffix = 0;
   for (; edit_i < edits.size(); ++edit_i) {
     if (n_suffix >= context) {
       // Continue only if the next hunk is very close.
       auto it = edits.begin() + static_cast<int>(edit_i);
       while (it != edits.end() && *it == kMatch) ++it;
       if (it == edits.end() ||
           static_cast<size_t>(it - edits.begin()) - edit_i >= context) {
         // There is no next edit or it is too far away.
         break;
       }
     }

     EditType edit = edits[edit_i];
     // Reset count when a non match is found.
     n_suffix = edit == kMatch ? n_suffix + 1 : 0;

     if (edit == kMatch || edit == kRemove || edit == kReplace) {
       hunk.PushLine(edit == kMatch ? ' ' : '-', left[l_i].c_str());
     }
     if (edit == kAdd || edit == kReplace) {
       hunk.PushLine('+', right[r_i].c_str());
     }

     // Advance indices, depending on edit type.
     l_i += edit != kAdd;
     r_i += edit != kRemove;
   }

   if (!hunk.has_edits()) {
     // We are done. We don't want this hunk.
     break;
   }

   hunk.PrintTo(&ss);
 }
 return ss.str();
}

}  // namespace edit_distance

namespace {

// The string representation of the values received in EqFailure() are already
// escaped. Split them on escaped '\n' boundaries. Leave all other escaped
// characters the same.
std::vector<std::string> SplitEscapedString(const std::string& str) {
 std::vector<std::string> lines;
 size_t start = 0, end = str.size();
 if (end > 2 && str[0] == '"' && str[end - 1] == '"') {
   ++start;
   --end;
 }
 bool escaped = false;
 for (size_t i = start; i + 1 < end; ++i) {
   if (escaped) {
     escaped = false;
     if (str[i] == 'n') {
       lines.push_back(str.substr(start, i - start - 1));
       start = i + 1;
     }
   } else {
     escaped = str[i] == '\\';
   }
 }
 lines.push_back(str.substr(start, end - start));
 return lines;
}

}  // namespace

// Constructs and returns the message for an equality assertion
// (e.g. ASSERT_EQ, EXPECT_STREQ, etc) failure.
//
// The first four parameters are the expressions used in the assertion
// and their values, as strings.  For example, for ASSERT_EQ(foo, bar)
// where foo is 5 and bar is 6, we have:
//
//   lhs_expression: "foo"
//   rhs_expression: "bar"
//   lhs_value:      "5"
//   rhs_value:      "6"
//
// The ignoring_case parameter is true if and only if the assertion is a
// *_STRCASEEQ*.  When it's true, the string "Ignoring case" will
// be inserted into the message.
AssertionResult EqFailure(const char* lhs_expression,
                         const char* rhs_expression,
                         const std::string& lhs_value,
                         const std::string& rhs_value,
                         bool ignoring_case) {
 Message msg;
 msg << "Expected equality of these values:";
 msg << "\n  " << lhs_expression;
 if (lhs_value != lhs_expression) {
   msg << "\n    Which is: " << lhs_value;
 }
 msg << "\n  " << rhs_expression;
 if (rhs_value != rhs_expression) {
   msg << "\n    Which is: " << rhs_value;
 }

 if (ignoring_case) {
   msg << "\nIgnoring case";
 }

 if (!lhs_value.empty() && !rhs_value.empty()) {
   const std::vector<std::string> lhs_lines =
       SplitEscapedString(lhs_value);
   const std::vector<std::string> rhs_lines =
       SplitEscapedString(rhs_value);
   if (lhs_lines.size() > 1 || rhs_lines.size() > 1) {
     msg << "\nWith diff:\n"
         << edit_distance::CreateUnifiedDiff(lhs_lines, rhs_lines);
   }
 }

 return AssertionFailure() << msg;
}

// Constructs a failure message for Boolean assertions such as EXPECT_TRUE.
std::string GetBoolAssertionFailureMessage(
   const AssertionResult& assertion_result,
   const char* expression_text,
   const char* actual_predicate_value,
   const char* expected_predicate_value) {
 const char* actual_message = assertion_result.message();
 Message msg;
 msg << "Value of: " << expression_text
     << "\n  Actual: " << actual_predicate_value;
 if (actual_message[0] != '\0')
   msg << " (" << actual_message << ")";
 msg << "\nExpected: " << expected_predicate_value;
 return msg.GetString();
}

// Helper function for implementing ASSERT_NEAR.
AssertionResult DoubleNearPredFormat(const char* expr1,
                                    const char* expr2,
                                    const char* abs_error_expr,
                                    double val1,
                                    double val2,
                                    double abs_error) {
 const double diff = fabs(val1 - val2);
 if (diff <= abs_error) return AssertionSuccess();

 // Find the value which is closest to zero.
 const double min_abs = std::min(fabs(val1), fabs(val2));
 // Find the distance to the next double from that value.
 const double epsilon =
     nextafter(min_abs, std::numeric_limits<double>::infinity()) - min_abs;
 // Detect the case where abs_error is so small that EXPECT_NEAR is
 // effectively the same as EXPECT_EQUAL, and give an informative error
 // message so that the situation can be more easily understood without
 // requiring exotic floating-point knowledge.
 // Don't do an epsilon check if abs_error is zero because that implies
 // that an equality check was actually intended.
 if (!(std::isnan)(val1) && !(std::isnan)(val2) && abs_error > 0 &&
     abs_error < epsilon) {
   return AssertionFailure()
          << "The difference between " << expr1 << " and " << expr2 << " is "
          << diff << ", where\n"
          << expr1 << " evaluates to " << val1 << ",\n"
          << expr2 << " evaluates to " << val2 << ".\nThe abs_error parameter "
          << abs_error_expr << " evaluates to " << abs_error
          << " which is smaller than the minimum distance between doubles for "
             "numbers of this magnitude which is "
          << epsilon
          << ", thus making this EXPECT_NEAR check equivalent to "
             "EXPECT_EQUAL. Consider using EXPECT_DOUBLE_EQ instead.";
 }
 return AssertionFailure()
     << "The difference between " << expr1 << " and " << expr2
     << " is " << diff << ", which exceeds " << abs_error_expr << ", where\n"
     << expr1 << " evaluates to " << val1 << ",\n"
     << expr2 << " evaluates to " << val2 << ", and\n"
     << abs_error_expr << " evaluates to " << abs_error << ".";
}


// Helper template for implementing FloatLE() and DoubleLE().
template <typename RawType>
AssertionResult FloatingPointLE(const char* expr1,
                               const char* expr2,
                               RawType val1,
                               RawType val2) {
 // Returns success if val1 is less than val2,
 if (val1 < val2) {
   return AssertionSuccess();
 }

 // or if val1 is almost equal to val2.
 const FloatingPoint<RawType> lhs(val1), rhs(val2);
 if (lhs.AlmostEquals(rhs)) {
   return AssertionSuccess();
 }

 // Note that the above two checks will both fail if either val1 or
 // val2 is NaN, as the IEEE floating-point standard requires that
 // any predicate involving a NaN must return false.

 ::std::stringstream val1_ss;
 val1_ss << std::setprecision(std::numeric_limits<RawType>::digits10 + 2)
         << val1;

 ::std::stringstream val2_ss;
 val2_ss << std::setprecision(std::numeric_limits<RawType>::digits10 + 2)
         << val2;

 return AssertionFailure()
     << "Expected: (" << expr1 << ") <= (" << expr2 << ")\n"
     << "  Actual: " << StringStreamToString(&val1_ss) << " vs "
     << StringStreamToString(&val2_ss);
}

}  // namespace internal

// Asserts that val1 is less than, or almost equal to, val2.  Fails
// otherwise.  In particular, it fails if either val1 or val2 is NaN.
AssertionResult FloatLE(const char* expr1, const char* expr2,
                       float val1, float val2) {
 return internal::FloatingPointLE<float>(expr1, expr2, val1, val2);
}

// Asserts that val1 is less than, or almost equal to, val2.  Fails
// otherwise.  In particular, it fails if either val1 or val2 is NaN.
AssertionResult DoubleLE(const char* expr1, const char* expr2,
                        double val1, double val2) {
 return internal::FloatingPointLE<double>(expr1, expr2, val1, val2);
}

namespace internal {

// The helper function for {ASSERT|EXPECT}_STREQ.
AssertionResult CmpHelperSTREQ(const char* lhs_expression,
                              const char* rhs_expression,
                              const char* lhs,
                              const char* rhs) {
 if (String::CStringEquals(lhs, rhs)) {
   return AssertionSuccess();
 }

 return EqFailure(lhs_expression,
                  rhs_expression,
                  PrintToString(lhs),
                  PrintToString(rhs),
                  false);
}

// The helper function for {ASSERT|EXPECT}_STRCASEEQ.
AssertionResult CmpHelperSTRCASEEQ(const char* lhs_expression,
                                  const char* rhs_expression,
                                  const char* lhs,
                                  const char* rhs) {
 if (String::CaseInsensitiveCStringEquals(lhs, rhs)) {
   return AssertionSuccess();
 }

 return EqFailure(lhs_expression,
                  rhs_expression,
                  PrintToString(lhs),
                  PrintToString(rhs),
                  true);
}

// The helper function for {ASSERT|EXPECT}_STRNE.
AssertionResult CmpHelperSTRNE(const char* s1_expression,
                              const char* s2_expression,
                              const char* s1,
                              const char* s2) {
 if (!String::CStringEquals(s1, s2)) {
   return AssertionSuccess();
 } else {
   return AssertionFailure() << "Expected: (" << s1_expression << ") != ("
                             << s2_expression << "), actual: \""
                             << s1 << "\" vs \"" << s2 << "\"";
 }
}

// The helper function for {ASSERT|EXPECT}_STRCASENE.
AssertionResult CmpHelperSTRCASENE(const char* s1_expression,
                                  const char* s2_expression,
                                  const char* s1,
                                  const char* s2) {
 if (!String::CaseInsensitiveCStringEquals(s1, s2)) {
   return AssertionSuccess();
 } else {
   return AssertionFailure()
       << "Expected: (" << s1_expression << ") != ("
       << s2_expression << ") (ignoring case), actual: \""
       << s1 << "\" vs \"" << s2 << "\"";
 }
}

}  // namespace internal

namespace {

// Helper functions for implementing IsSubString() and IsNotSubstring().

// This group of overloaded functions return true if and only if needle
// is a substring of haystack.  NULL is considered a substring of
// itself only.

bool IsSubstringPred(const char* needle, const char* haystack) {
 if (needle == nullptr || haystack == nullptr) return needle == haystack;

 return strstr(haystack, needle) != nullptr;
}

bool IsSubstringPred(const wchar_t* needle, const wchar_t* haystack) {
 if (needle == nullptr || haystack == nullptr) return needle == haystack;

 return wcsstr(haystack, needle) != nullptr;
}

// StringType here can be either ::std::string or ::std::wstring.
template <typename StringType>
bool IsSubstringPred(const StringType& needle,
                    const StringType& haystack) {
 return haystack.find(needle) != StringType::npos;
}

// This function implements either IsSubstring() or IsNotSubstring(),
// depending on the value of the expected_to_be_substring parameter.
// StringType here can be const char*, const wchar_t*, ::std::string,
// or ::std::wstring.
template <typename StringType>
AssertionResult IsSubstringImpl(
   bool expected_to_be_substring,
   const char* needle_expr, const char* haystack_expr,
   const StringType& needle, const StringType& haystack) {
 if (IsSubstringPred(needle, haystack) == expected_to_be_substring)
   return AssertionSuccess();

 const bool is_wide_string = sizeof(needle[0]) > 1;
 const char* const begin_string_quote = is_wide_string ? "L\"" : "\"";
 return AssertionFailure()
     << "Value of: " << needle_expr << "\n"
     << "  Actual: " << begin_string_quote << needle << "\"\n"
     << "Expected: " << (expected_to_be_substring ? "" : "not ")
     << "a substring of " << haystack_expr << "\n"
     << "Which is: " << begin_string_quote << haystack << "\"";
}

}  // namespace

// IsSubstring() and IsNotSubstring() check whether needle is a
// substring of haystack (NULL is considered a substring of itself
// only), and return an appropriate error message when they fail.

AssertionResult IsSubstring(
   const char* needle_expr, const char* haystack_expr,
   const char* needle, const char* haystack) {
 return IsSubstringImpl(true, needle_expr, haystack_expr, needle, haystack);
}

AssertionResult IsSubstring(
   const char* needle_expr, const char* haystack_expr,
   const wchar_t* needle, const wchar_t* haystack) {
 return IsSubstringImpl(true, needle_expr, haystack_expr, needle, haystack);
}

AssertionResult IsNotSubstring(
   const char* needle_expr, const char* haystack_expr,
   const char* needle, const char* haystack) {
 return IsSubstringImpl(false, needle_expr, haystack_expr, needle, haystack);
}

AssertionResult IsNotSubstring(
   const char* needle_expr, const char* haystack_expr,
   const wchar_t* needle, const wchar_t* haystack) {
 return IsSubstringImpl(false, needle_expr, haystack_expr, needle, haystack);
}

AssertionResult IsSubstring(
   const char* needle_expr, const char* haystack_expr,
   const ::std::string& needle, const ::std::string& haystack) {
 return IsSubstringImpl(true, needle_expr, haystack_expr, needle, haystack);
}

AssertionResult IsNotSubstring(
   const char* needle_expr, const char* haystack_expr,
   const ::std::string& needle, const ::std::string& haystack) {
 return IsSubstringImpl(false, needle_expr, haystack_expr, needle, haystack);
}

#if GTEST_HAS_STD_WSTRING
AssertionResult IsSubstring(
   const char* needle_expr, const char* haystack_expr,
   const ::std::wstring& needle, const ::std::wstring& haystack) {
 return IsSubstringImpl(true, needle_expr, haystack_expr, needle, haystack);
}

AssertionResult IsNotSubstring(
   const char* needle_expr, const char* haystack_expr,
   const ::std::wstring& needle, const ::std::wstring& haystack) {
 return IsSubstringImpl(false, needle_expr, haystack_expr, needle, haystack);
}
#endif  // GTEST_HAS_STD_WSTRING

namespace internal {

#if GTEST_OS_WINDOWS

namespace {

// Helper function for IsHRESULT{SuccessFailure} predicates
AssertionResult HRESULTFailureHelper(const char* expr,
                                    const char* expected,
                                    long hr) {  // NOLINT
# if GTEST_OS_WINDOWS_MOBILE || GTEST_OS_WINDOWS_TV_TITLE

 // Windows CE doesn't support FormatMessage.
 const char error_text[] = "";

# else

 // Looks up the human-readable system message for the HRESULT code
 // and since we're not passing any params to FormatMessage, we don't
 // want inserts expanded.
 const DWORD kFlags = FORMAT_MESSAGE_FROM_SYSTEM |
                      FORMAT_MESSAGE_IGNORE_INSERTS;
 const DWORD kBufSize = 4096;
 // Gets the system's human readable message string for this HRESULT.
 char error_text[kBufSize] = { '\0' };
 DWORD message_length = ::FormatMessageA(kFlags,
                                         0,   // no source, we're asking system
                                         static_cast<DWORD>(hr),  // the error
                                         0,   // no line width restrictions
                                         error_text,  // output buffer
                                         kBufSize,    // buf size
                                         nullptr);  // no arguments for inserts
 // Trims tailing white space (FormatMessage leaves a trailing CR-LF)
 for (; message_length && IsSpace(error_text[message_length - 1]);
         --message_length) {
   error_text[message_length - 1] = '\0';
 }

# endif  // GTEST_OS_WINDOWS_MOBILE

 const std::string error_hex("0x" + String::FormatHexInt(hr));
 return ::testing::AssertionFailure()
     << "Expected: " << expr << " " << expected << ".\n"
     << "  Actual: " << error_hex << " " << error_text << "\n";
}

}  // namespace

AssertionResult IsHRESULTSuccess(const char* expr, long hr) {  // NOLINT
 if (SUCCEEDED(hr)) {
   return AssertionSuccess();
 }
 return HRESULTFailureHelper(expr, "succeeds", hr);
}

AssertionResult IsHRESULTFailure(const char* expr, long hr) {  // NOLINT
 if (FAILED(hr)) {
   return AssertionSuccess();
 }
 return HRESULTFailureHelper(expr, "fails", hr);
}

#endif  // GTEST_OS_WINDOWS

// Utility functions for encoding Unicode text (wide strings) in
// UTF-8.

// A Unicode code-point can have up to 21 bits, and is encoded in UTF-8
// like this:
//
// Code-point length   Encoding
//   0 -  7 bits       0xxxxxxx
//   8 - 11 bits       110xxxxx 10xxxxxx
//  12 - 16 bits       1110xxxx 10xxxxxx 10xxxxxx
//  17 - 21 bits       11110xxx 10xxxxxx 10xxxxxx 10xxxxxx

// The maximum code-point a one-byte UTF-8 sequence can represent.
constexpr uint32_t kMaxCodePoint1 = (static_cast<uint32_t>(1) <<  7) - 1;

// The maximum code-point a two-byte UTF-8 sequence can represent.
constexpr uint32_t kMaxCodePoint2 = (static_cast<uint32_t>(1) << (5 + 6)) - 1;

// The maximum code-point a three-byte UTF-8 sequence can represent.
constexpr uint32_t kMaxCodePoint3 = (static_cast<uint32_t>(1) << (4 + 2*6)) - 1;

// The maximum code-point a four-byte UTF-8 sequence can represent.
constexpr uint32_t kMaxCodePoint4 = (static_cast<uint32_t>(1) << (3 + 3*6)) - 1;

// Chops off the n lowest bits from a bit pattern.  Returns the n
// lowest bits.  As a side effect, the original bit pattern will be
// shifted to the right by n bits.
inline uint32_t ChopLowBits(uint32_t* bits, int n) {
 const uint32_t low_bits = *bits & ((static_cast<uint32_t>(1) << n) - 1);
 *bits >>= n;
 return low_bits;
}

// Converts a Unicode code point to a narrow string in UTF-8 encoding.
// code_point parameter is of type uint32_t because wchar_t may not be
// wide enough to contain a code point.
// If the code_point is not a valid Unicode code point
// (i.e. outside of Unicode range U+0 to U+10FFFF) it will be converted
// to "(Invalid Unicode 0xXXXXXXXX)".
std::string CodePointToUtf8(uint32_t code_point) {
 if (code_point > kMaxCodePoint4) {
   return "(Invalid Unicode 0x" + String::FormatHexUInt32(code_point) + ")";
 }

 char str[5];  // Big enough for the largest valid code point.
 if (code_point <= kMaxCodePoint1) {
   str[1] = '\0';
   str[0] = static_cast<char>(code_point);                          // 0xxxxxxx
 } else if (code_point <= kMaxCodePoint2) {
   str[2] = '\0';
   str[1] = static_cast<char>(0x80 | ChopLowBits(&code_point, 6));  // 10xxxxxx
   str[0] = static_cast<char>(0xC0 | code_point);                   // 110xxxxx
 } else if (code_point <= kMaxCodePoint3) {
   str[3] = '\0';
   str[2] = static_cast<char>(0x80 | ChopLowBits(&code_point, 6));  // 10xxxxxx
   str[1] = static_cast<char>(0x80 | ChopLowBits(&code_point, 6));  // 10xxxxxx
   str[0] = static_cast<char>(0xE0 | code_point);                   // 1110xxxx
 } else {  // code_point <= kMaxCodePoint4
   str[4] = '\0';
   str[3] = static_cast<char>(0x80 | ChopLowBits(&code_point, 6));  // 10xxxxxx
   str[2] = static_cast<char>(0x80 | ChopLowBits(&code_point, 6));  // 10xxxxxx
   str[1] = static_cast<char>(0x80 | ChopLowBits(&code_point, 6));  // 10xxxxxx
   str[0] = static_cast<char>(0xF0 | code_point);                   // 11110xxx
 }
 return str;
}

// The following two functions only make sense if the system
// uses UTF-16 for wide string encoding. All supported systems
// with 16 bit wchar_t (Windows, Cygwin) do use UTF-16.

// Determines if the arguments constitute UTF-16 surrogate pair
// and thus should be combined into a single Unicode code point
// using CreateCodePointFromUtf16SurrogatePair.
inline bool IsUtf16SurrogatePair(wchar_t first, wchar_t second) {
 return sizeof(wchar_t) == 2 &&
     (first & 0xFC00) == 0xD800 && (second & 0xFC00) == 0xDC00;
}

// Creates a Unicode code point from UTF16 surrogate pair.
inline uint32_t CreateCodePointFromUtf16SurrogatePair(wchar_t first,
                                                     wchar_t second) {
 const auto first_u = static_cast<uint32_t>(first);
 const auto second_u = static_cast<uint32_t>(second);
 const uint32_t mask = (1 << 10) - 1;
 return (sizeof(wchar_t) == 2)
            ? (((first_u & mask) << 10) | (second_u & mask)) + 0x10000
            :
            // This function should not be called when the condition is
            // false, but we provide a sensible default in case it is.
            first_u;
}

// Converts a wide string to a narrow string in UTF-8 encoding.
// The wide string is assumed to have the following encoding:
//   UTF-16 if sizeof(wchar_t) == 2 (on Windows, Cygwin)
//   UTF-32 if sizeof(wchar_t) == 4 (on Linux)
// Parameter str points to a null-terminated wide string.
// Parameter num_chars may additionally limit the number
// of wchar_t characters processed. -1 is used when the entire string
// should be processed.
// If the string contains code points that are not valid Unicode code points
// (i.e. outside of Unicode range U+0 to U+10FFFF) they will be output
// as '(Invalid Unicode 0xXXXXXXXX)'. If the string is in UTF16 encoding
// and contains invalid UTF-16 surrogate pairs, values in those pairs
// will be encoded as individual Unicode characters from Basic Normal Plane.
std::string WideStringToUtf8(const wchar_t* str, int num_chars) {
 if (num_chars == -1)
   num_chars = static_cast<int>(wcslen(str));

 ::std::stringstream stream;
 for (int i = 0; i < num_chars; ++i) {
   uint32_t unicode_code_point;

   if (str[i] == L'\0') {
     break;
   } else if (i + 1 < num_chars && IsUtf16SurrogatePair(str[i], str[i + 1])) {
     unicode_code_point = CreateCodePointFromUtf16SurrogatePair(str[i],
                                                                str[i + 1]);
     i++;
   } else {
     unicode_code_point = static_cast<uint32_t>(str[i]);
   }

   stream << CodePointToUtf8(unicode_code_point);
 }
 return StringStreamToString(&stream);
}

// Converts a wide C string to an std::string using the UTF-8 encoding.
// NULL will be converted to "(null)".
std::string String::ShowWideCString(const wchar_t * wide_c_str) {
 if (wide_c_str == nullptr) return "(null)";

 return internal::WideStringToUtf8(wide_c_str, -1);
}

// Compares two wide C strings.  Returns true if and only if they have the
// same content.
//
// Unlike wcscmp(), this function can handle NULL argument(s).  A NULL
// C string is considered different to any non-NULL C string,
// including the empty string.
bool String::WideCStringEquals(const wchar_t * lhs, const wchar_t * rhs) {
 if (lhs == nullptr) return rhs == nullptr;

 if (rhs == nullptr) return false;

 return wcscmp(lhs, rhs) == 0;
}

// Helper function for *_STREQ on wide strings.
AssertionResult CmpHelperSTREQ(const char* lhs_expression,
                              const char* rhs_expression,
                              const wchar_t* lhs,
                              const wchar_t* rhs) {
 if (String::WideCStringEquals(lhs, rhs)) {
   return AssertionSuccess();
 }

 return EqFailure(lhs_expression,
                  rhs_expression,
                  PrintToString(lhs),
                  PrintToString(rhs),
                  false);
}

// Helper function for *_STRNE on wide strings.
AssertionResult CmpHelperSTRNE(const char* s1_expression,
                              const char* s2_expression,
                              const wchar_t* s1,
                              const wchar_t* s2) {
 if (!String::WideCStringEquals(s1, s2)) {
   return AssertionSuccess();
 }

 return AssertionFailure() << "Expected: (" << s1_expression << ") != ("
                           << s2_expression << "), actual: "
                           << PrintToString(s1)
                           << " vs " << PrintToString(s2);
}

// Compares two C strings, ignoring case.  Returns true if and only if they have
// the same content.
//
// Unlike strcasecmp(), this function can handle NULL argument(s).  A
// NULL C string is considered different to any non-NULL C string,
// including the empty string.
bool String::CaseInsensitiveCStringEquals(const char * lhs, const char * rhs) {
 if (lhs == nullptr) return rhs == nullptr;
 if (rhs == nullptr) return false;
 return posix::StrCaseCmp(lhs, rhs) == 0;
}

// Compares two wide C strings, ignoring case.  Returns true if and only if they
// have the same content.
//
// Unlike wcscasecmp(), this function can handle NULL argument(s).
// A NULL C string is considered different to any non-NULL wide C string,
// including the empty string.
// NB: The implementations on different platforms slightly differ.
// On windows, this method uses _wcsicmp which compares according to LC_CTYPE
// environment variable. On GNU platform this method uses wcscasecmp
// which compares according to LC_CTYPE category of the current locale.
// On MacOS X, it uses towlower, which also uses LC_CTYPE category of the
// current locale.
bool String::CaseInsensitiveWideCStringEquals(const wchar_t* lhs,
                                             const wchar_t* rhs) {
 if (lhs == nullptr) return rhs == nullptr;

 if (rhs == nullptr) return false;

#if GTEST_OS_WINDOWS
 return _wcsicmp(lhs, rhs) == 0;
#elif GTEST_OS_LINUX && !GTEST_OS_LINUX_ANDROID
 return wcscasecmp(lhs, rhs) == 0;
#else
 // Android, Mac OS X and Cygwin don't define wcscasecmp.
 // Other unknown OSes may not define it either.
 wint_t left, right;
 do {
   left = towlower(static_cast<wint_t>(*lhs++));
   right = towlower(static_cast<wint_t>(*rhs++));
 } while (left && left == right);
 return left == right;
#endif  // OS selector
}

// Returns true if and only if str ends with the given suffix, ignoring case.
// Any string is considered to end with an empty suffix.
bool String::EndsWithCaseInsensitive(
   const std::string& str, const std::string& suffix) {
 const size_t str_len = str.length();
 const size_t suffix_len = suffix.length();
 return (str_len >= suffix_len) &&
        CaseInsensitiveCStringEquals(str.c_str() + str_len - suffix_len,
                                     suffix.c_str());
}

// Formats an int value as "%02d".
std::string String::FormatIntWidth2(int value) {
 return FormatIntWidthN(value, 2);
}

// Formats an int value to given width with leading zeros.
std::string String::FormatIntWidthN(int value, int width) {
 std::stringstream ss;
 ss << std::setfill('0') << std::setw(width) << value;
 return ss.str();
}

// Formats an int value as "%X".
std::string String::FormatHexUInt32(uint32_t value) {
 std::stringstream ss;
 ss << std::hex << std::uppercase << value;
 return ss.str();
}

// Formats an int value as "%X".
std::string String::FormatHexInt(int value) {
 return FormatHexUInt32(static_cast<uint32_t>(value));
}

// Formats a byte as "%02X".
std::string String::FormatByte(unsigned char value) {
 std::stringstream ss;
 ss << std::setfill('0') << std::setw(2) << std::hex << std::uppercase
    << static_cast<unsigned int>(value);
 return ss.str();
}

// Converts the buffer in a stringstream to an std::string, converting NUL
// bytes to "\\0" along the way.
std::string StringStreamToString(::std::stringstream* ss) {
 const ::std::string& str = ss->str();
 const char* const start = str.c_str();
 const char* const end = start + str.length();

 std::string result;
 result.reserve(static_cast<size_t>(2 * (end - start)));
 for (const char* ch = start; ch != end; ++ch) {
   if (*ch == '\0') {
     result += "\\0";  // Replaces NUL with "\\0";
   } else {
     result += *ch;
   }
 }

 return result;
}

// Appends the user-supplied message to the Google-Test-generated message.
std::string AppendUserMessage(const std::string& gtest_msg,
                             const Message& user_msg) {
 // Appends the user message if it's non-empty.
 const std::string user_msg_string = user_msg.GetString();
 if (user_msg_string.empty()) {
   return gtest_msg;
 }
 if (gtest_msg.empty()) {
   return user_msg_string;
 }
 return gtest_msg + "\n" + user_msg_string;
}

}  // namespace internal

// class TestResult

// Creates an empty TestResult.
TestResult::TestResult()
   : death_test_count_(0), start_timestamp_(0), elapsed_time_(0) {}

// D'tor.
TestResult::~TestResult() {
}

// Returns the i-th test part result among all the results. i can
// range from 0 to total_part_count() - 1. If i is not in that range,
// aborts the program.
const TestPartResult& TestResult::GetTestPartResult(int i) const {
 if (i < 0 || i >= total_part_count())
   internal::posix::Abort();
 return test_part_results_.at(static_cast<size_t>(i));
}

// Returns the i-th test property. i can range from 0 to
// test_property_count() - 1. If i is not in that range, aborts the
// program.
const TestProperty& TestResult::GetTestProperty(int i) const {
 if (i < 0 || i >= test_property_count())
   internal::posix::Abort();
 return test_properties_.at(static_cast<size_t>(i));
}

// Clears the test part results.
void TestResult::ClearTestPartResults() {
 test_part_results_.clear();
}

// Adds a test part result to the list.
void TestResult::AddTestPartResult(const TestPartResult& test_part_result) {
 test_part_results_.push_back(test_part_result);
}

// Adds a test property to the list. If a property with the same key as the
// supplied property is already represented, the value of this test_property
// replaces the old value for that key.
void TestResult::RecordProperty(const std::string& xml_element,
                               const TestProperty& test_property) {
 if (!ValidateTestProperty(xml_element, test_property)) {
   return;
 }
 internal::MutexLock lock(&test_properties_mutex_);
 const std::vector<TestProperty>::iterator property_with_matching_key =
     std::find_if(test_properties_.begin(), test_properties_.end(),
                  internal::TestPropertyKeyIs(test_property.key()));
 if (property_with_matching_key == test_properties_.end()) {
   test_properties_.push_back(test_property);
   return;
 }
 property_with_matching_key->SetValue(test_property.value());
}

// The list of reserved attributes used in the <testsuites> element of XML
// output.
static const char* const kReservedTestSuitesAttributes[] = {
 "disabled",
 "errors",
 "failures",
 "name",
 "random_seed",
 "tests",
 "time",
 "timestamp"
};

// The list of reserved attributes used in the <testsuite> element of XML
// output.
static const char* const kReservedTestSuiteAttributes[] = {
   "disabled", "errors", "failures",  "name",
   "tests",    "time",   "timestamp", "skipped"};

// The list of reserved attributes used in the <testcase> element of XML output.
static const char* const kReservedTestCaseAttributes[] = {
   "classname",   "name", "status", "time",  "type_param",
   "value_param", "file", "line"};

// Use a slightly different set for allowed output to ensure existing tests can
// still RecordProperty("result") or "RecordProperty(timestamp")
static const char* const kReservedOutputTestCaseAttributes[] = {
   "classname",   "name", "status", "time",   "type_param",
   "value_param", "file", "line",   "result", "timestamp"};

template <size_t kSize>
std::vector<std::string> ArrayAsVector(const char* const (&array)[kSize]) {
 return std::vector<std::string>(array, array + kSize);
}

static std::vector<std::string> GetReservedAttributesForElement(
   const std::string& xml_element) {
 if (xml_element == "testsuites") {
   return ArrayAsVector(kReservedTestSuitesAttributes);
 } else if (xml_element == "testsuite") {
   return ArrayAsVector(kReservedTestSuiteAttributes);
 } else if (xml_element == "testcase") {
   return ArrayAsVector(kReservedTestCaseAttributes);
 } else {
   GTEST_CHECK_(false) << "Unrecognized xml_element provided: " << xml_element;
 }
 // This code is unreachable but some compilers may not realizes that.
 return std::vector<std::string>();
}

// TODO(jdesprez): Merge the two getReserved attributes once skip is improved
static std::vector<std::string> GetReservedOutputAttributesForElement(
   const std::string& xml_element) {
 if (xml_element == "testsuites") {
   return ArrayAsVector(kReservedTestSuitesAttributes);
 } else if (xml_element == "testsuite") {
   return ArrayAsVector(kReservedTestSuiteAttributes);
 } else if (xml_element == "testcase") {
   return ArrayAsVector(kReservedOutputTestCaseAttributes);
 } else {
   GTEST_CHECK_(false) << "Unrecognized xml_element provided: " << xml_element;
 }
 // This code is unreachable but some compilers may not realizes that.
 return std::vector<std::string>();
}

static std::string FormatWordList(const std::vector<std::string>& words) {
 Message word_list;
 for (size_t i = 0; i < words.size(); ++i) {
   if (i > 0 && words.size() > 2) {
     word_list << ", ";
   }
   if (i == words.size() - 1) {
     word_list << "and ";
   }
   word_list << "'" << words[i] << "'";
 }
 return word_list.GetString();
}

static bool ValidateTestPropertyName(
   const std::string& property_name,
   const std::vector<std::string>& reserved_names) {
 if (std::find(reserved_names.begin(), reserved_names.end(), property_name) !=
         reserved_names.end()) {
   ADD_FAILURE() << "Reserved key used in RecordProperty(): " << property_name
                 << " (" << FormatWordList(reserved_names)
                 << " are reserved by " << GTEST_NAME_ << ")";
   return false;
 }
 return true;
}

// Adds a failure if the key is a reserved attribute of the element named
// xml_element.  Returns true if the property is valid.
bool TestResult::ValidateTestProperty(const std::string& xml_element,
                                     const TestProperty& test_property) {
 return ValidateTestPropertyName(test_property.key(),
                                 GetReservedAttributesForElement(xml_element));
}

// Clears the object.
void TestResult::Clear() {
 test_part_results_.clear();
 test_properties_.clear();
 death_test_count_ = 0;
 elapsed_time_ = 0;
}

// Returns true off the test part was skipped.
static bool TestPartSkipped(const TestPartResult& result) {
 return result.skipped();
}

// Returns true if and only if the test was skipped.
bool TestResult::Skipped() const {
 return !Failed() && CountIf(test_part_results_, TestPartSkipped) > 0;
}

// Returns true if and only if the test failed.
bool TestResult::Failed() const {
 for (int i = 0; i < total_part_count(); ++i) {
   if (GetTestPartResult(i).failed())
     return true;
 }
 return false;
}

// Returns true if and only if the test part fatally failed.
static bool TestPartFatallyFailed(const TestPartResult& result) {
 return result.fatally_failed();
}

// Returns true if and only if the test fatally failed.
bool TestResult::HasFatalFailure() const {
 return CountIf(test_part_results_, TestPartFatallyFailed) > 0;
}

// Returns true if and only if the test part non-fatally failed.
static bool TestPartNonfatallyFailed(const TestPartResult& result) {
 return result.nonfatally_failed();
}

// Returns true if and only if the test has a non-fatal failure.
bool TestResult::HasNonfatalFailure() const {
 return CountIf(test_part_results_, TestPartNonfatallyFailed) > 0;
}

// Gets the number of all test parts.  This is the sum of the number
// of successful test parts and the number of failed test parts.
int TestResult::total_part_count() const {
 return static_cast<int>(test_part_results_.size());
}

// Returns the number of the test properties.
int TestResult::test_property_count() const {
 return static_cast<int>(test_properties_.size());
}

// class Test

// Creates a Test object.

// The c'tor saves the states of all flags.
Test::Test()
   : gtest_flag_saver_(new GTEST_FLAG_SAVER_) {
}

// The d'tor restores the states of all flags.  The actual work is
// done by the d'tor of the gtest_flag_saver_ field, and thus not
// visible here.
Test::~Test() {
}

// Sets up the test fixture.
//
// A sub-class may override this.
void Test::SetUp() {
}

// Tears down the test fixture.
//
// A sub-class may override this.
void Test::TearDown() {
}

// Allows user supplied key value pairs to be recorded for later output.
void Test::RecordProperty(const std::string& key, const std::string& value) {
 UnitTest::GetInstance()->RecordProperty(key, value);
}

// Allows user supplied key value pairs to be recorded for later output.
void Test::RecordProperty(const std::string& key, int value) {
 Message value_message;
 value_message << value;
 RecordProperty(key, value_message.GetString().c_str());
}

namespace internal {

void ReportFailureInUnknownLocation(TestPartResult::Type result_type,
                                   const std::string& message) {
 // This function is a friend of UnitTest and as such has access to
 // AddTestPartResult.
 UnitTest::GetInstance()->AddTestPartResult(
     result_type,
     nullptr,  // No info about the source file where the exception occurred.
     -1,       // We have no info on which line caused the exception.
     message,
     "");  // No stack trace, either.
}

}  // namespace internal

// Google Test requires all tests in the same test suite to use the same test
// fixture class.  This function checks if the current test has the
// same fixture class as the first test in the current test suite.  If
// yes, it returns true; otherwise it generates a Google Test failure and
// returns false.
bool Test::HasSameFixtureClass() {
 internal::UnitTestImpl* const impl = internal::GetUnitTestImpl();
 const TestSuite* const test_suite = impl->current_test_suite();

 // Info about the first test in the current test suite.
 const TestInfo* const first_test_info = test_suite->test_info_list()[0];
 const internal::TypeId first_fixture_id = first_test_info->fixture_class_id_;
 const char* const first_test_name = first_test_info->name();

 // Info about the current test.
 const TestInfo* const this_test_info = impl->current_test_info();
 const internal::TypeId this_fixture_id = this_test_info->fixture_class_id_;
 const char* const this_test_name = this_test_info->name();

 if (this_fixture_id != first_fixture_id) {
   // Is the first test defined using TEST?
   const bool first_is_TEST = first_fixture_id == internal::GetTestTypeId();
   // Is this test defined using TEST?
   const bool this_is_TEST = this_fixture_id == internal::GetTestTypeId();

   if (first_is_TEST || this_is_TEST) {
     // Both TEST and TEST_F appear in same test suite, which is incorrect.
     // Tell the user how to fix this.

     // Gets the name of the TEST and the name of the TEST_F.  Note
     // that first_is_TEST and this_is_TEST cannot both be true, as
     // the fixture IDs are different for the two tests.
     const char* const TEST_name =
         first_is_TEST ? first_test_name : this_test_name;
     const char* const TEST_F_name =
         first_is_TEST ? this_test_name : first_test_name;

     ADD_FAILURE()
         << "All tests in the same test suite must use the same test fixture\n"
         << "class, so mixing TEST_F and TEST in the same test suite is\n"
         << "illegal.  In test suite " << this_test_info->test_suite_name()
         << ",\n"
         << "test " << TEST_F_name << " is defined using TEST_F but\n"
         << "test " << TEST_name << " is defined using TEST.  You probably\n"
         << "want to change the TEST to TEST_F or move it to another test\n"
         << "case.";
   } else {
     // Two fixture classes with the same name appear in two different
     // namespaces, which is not allowed. Tell the user how to fix this.
     ADD_FAILURE()
         << "All tests in the same test suite must use the same test fixture\n"
         << "class.  However, in test suite "
         << this_test_info->test_suite_name() << ",\n"
         << "you defined test " << first_test_name << " and test "
         << this_test_name << "\n"
         << "using two different test fixture classes.  This can happen if\n"
         << "the two classes are from different namespaces or translation\n"
         << "units and have the same name.  You should probably rename one\n"
         << "of the classes to put the tests into different test suites.";
   }
   return false;
 }

 return true;
}

#if GTEST_HAS_SEH

// Adds an "exception thrown" fatal failure to the current test.  This
// function returns its result via an output parameter pointer because VC++
// prohibits creation of objects with destructors on stack in functions
// using __try (see error C2712).
static std::string* FormatSehExceptionMessage(DWORD exception_code,
                                             const char* location) {
 Message message;
 message << "SEH exception with code 0x" << std::setbase(16) <<
   exception_code << std::setbase(10) << " thrown in " << location << ".";

 return new std::string(message.GetString());
}

#endif  // GTEST_HAS_SEH

namespace internal {

#if GTEST_HAS_EXCEPTIONS

// Adds an "exception thrown" fatal failure to the current test.
static std::string FormatCxxExceptionMessage(const char* description,
                                            const char* location) {
 Message message;
 if (description != nullptr) {
   message << "C++ exception with description \"" << description << "\"";
 } else {
   message << "Unknown C++ exception";
 }
 message << " thrown in " << location << ".";

 return message.GetString();
}

static std::string PrintTestPartResultToString(
   const TestPartResult& test_part_result);

GoogleTestFailureException::GoogleTestFailureException(
   const TestPartResult& failure)
   : ::std::runtime_error(PrintTestPartResultToString(failure).c_str()) {}

#endif  // GTEST_HAS_EXCEPTIONS

// We put these helper functions in the internal namespace as IBM's xlC
// compiler rejects the code if they were declared static.

// Runs the given method and handles SEH exceptions it throws, when
// SEH is supported; returns the 0-value for type Result in case of an
// SEH exception.  (Microsoft compilers cannot handle SEH and C++
// exceptions in the same function.  Therefore, we provide a separate
// wrapper function for handling SEH exceptions.)
template <class T, typename Result>
Result HandleSehExceptionsInMethodIfSupported(
   T* object, Result (T::*method)(), const char* location) {
#if GTEST_HAS_SEH
 __try {
   return (object->*method)();
 } __except (internal::UnitTestOptions::GTestShouldProcessSEH(  // NOLINT
     GetExceptionCode())) {
   // We create the exception message on the heap because VC++ prohibits
   // creation of objects with destructors on stack in functions using __try
   // (see error C2712).
   std::string* exception_message = FormatSehExceptionMessage(
       GetExceptionCode(), location);
   internal::ReportFailureInUnknownLocation(TestPartResult::kFatalFailure,
                                            *exception_message);
   delete exception_message;
   return static_cast<Result>(0);
 }
#else
 (void)location;
 return (object->*method)();
#endif  // GTEST_HAS_SEH
}

// Runs the given method and catches and reports C++ and/or SEH-style
// exceptions, if they are supported; returns the 0-value for type
// Result in case of an SEH exception.
template <class T, typename Result>
Result HandleExceptionsInMethodIfSupported(
   T* object, Result (T::*method)(), const char* location) {
 // NOTE: The user code can affect the way in which Google Test handles
 // exceptions by setting GTEST_FLAG(catch_exceptions), but only before
 // RUN_ALL_TESTS() starts. It is technically possible to check the flag
 // after the exception is caught and either report or re-throw the
 // exception based on the flag's value:
 //
 // try {
 //   // Perform the test method.
 // } catch (...) {
 //   if (GTEST_FLAG(catch_exceptions))
 //     // Report the exception as failure.
 //   else
 //     throw;  // Re-throws the original exception.
 // }
 //
 // However, the purpose of this flag is to allow the program to drop into
 // the debugger when the exception is thrown. On most platforms, once the
 // control enters the catch block, the exception origin information is
 // lost and the debugger will stop the program at the point of the
 // re-throw in this function -- instead of at the point of the original
 // throw statement in the code under test.  For this reason, we perform
 // the check early, sacrificing the ability to affect Google Test's
 // exception handling in the method where the exception is thrown.
 if (internal::GetUnitTestImpl()->catch_exceptions()) {
#if GTEST_HAS_EXCEPTIONS
   try {
     return HandleSehExceptionsInMethodIfSupported(object, method, location);
   } catch (const AssertionException&) {  // NOLINT
     // This failure was reported already.
   } catch (const internal::GoogleTestFailureException&) {  // NOLINT
     // This exception type can only be thrown by a failed Google
     // Test assertion with the intention of letting another testing
     // framework catch it.  Therefore we just re-throw it.
     throw;
   } catch (const std::exception& e) {  // NOLINT
     internal::ReportFailureInUnknownLocation(
         TestPartResult::kFatalFailure,
         FormatCxxExceptionMessage(e.what(), location));
   } catch (...) {  // NOLINT
     internal::ReportFailureInUnknownLocation(
         TestPartResult::kFatalFailure,
         FormatCxxExceptionMessage(nullptr, location));
   }
   return static_cast<Result>(0);
#else
   return HandleSehExceptionsInMethodIfSupported(object, method, location);
#endif  // GTEST_HAS_EXCEPTIONS
 } else {
   return (object->*method)();
 }
}

}  // namespace internal

// Runs the test and updates the test result.
void Test::Run() {
 if (!HasSameFixtureClass()) return;

 internal::UnitTestImpl* const impl = internal::GetUnitTestImpl();
 impl->os_stack_trace_getter()->UponLeavingGTest();
 internal::HandleExceptionsInMethodIfSupported(this, &Test::SetUp, "SetUp()");
 // We will run the test only if SetUp() was successful and didn't call
 // GTEST_SKIP().
 if (!HasFatalFailure() && !IsSkipped()) {
   impl->os_stack_trace_getter()->UponLeavingGTest();
   internal::HandleExceptionsInMethodIfSupported(
       this, &Test::TestBody, "the test body");
 }

 // However, we want to clean up as much as possible.  Hence we will
 // always call TearDown(), even if SetUp() or the test body has
 // failed.
 impl->os_stack_trace_getter()->UponLeavingGTest();
 internal::HandleExceptionsInMethodIfSupported(
     this, &Test::TearDown, "TearDown()");
}

// Returns true if and only if the current test has a fatal failure.
bool Test::HasFatalFailure() {
 return internal::GetUnitTestImpl()->current_test_result()->HasFatalFailure();
}

// Returns true if and only if the current test has a non-fatal failure.
bool Test::HasNonfatalFailure() {
 return internal::GetUnitTestImpl()->current_test_result()->
     HasNonfatalFailure();
}

// Returns true if and only if the current test was skipped.
bool Test::IsSkipped() {
 return internal::GetUnitTestImpl()->current_test_result()->Skipped();
}

// class TestInfo

// Constructs a TestInfo object. It assumes ownership of the test factory
// object.
TestInfo::TestInfo(const std::string& a_test_suite_name,
                  const std::string& a_name, const char* a_type_param,
                  const char* a_value_param,
                  internal::CodeLocation a_code_location,
                  internal::TypeId fixture_class_id,
                  internal::TestFactoryBase* factory)
   : test_suite_name_(a_test_suite_name),
     name_(a_name),
     type_param_(a_type_param ? new std::string(a_type_param) : nullptr),
     value_param_(a_value_param ? new std::string(a_value_param) : nullptr),
     location_(a_code_location),
     fixture_class_id_(fixture_class_id),
     should_run_(false),
     is_disabled_(false),
     matches_filter_(false),
     is_in_another_shard_(false),
     factory_(factory),
     result_() {}

// Destructs a TestInfo object.
TestInfo::~TestInfo() { delete factory_; }

namespace internal {

// Creates a new TestInfo object and registers it with Google Test;
// returns the created object.
//
// Arguments:
//
//   test_suite_name:  name of the test suite
//   name:             name of the test
//   type_param:       the name of the test's type parameter, or NULL if
//                     this is not a typed or a type-parameterized test.
//   value_param:      text representation of the test's value parameter,
//                     or NULL if this is not a value-parameterized test.
//   code_location:    code location where the test is defined
//   fixture_class_id: ID of the test fixture class
//   set_up_tc:        pointer to the function that sets up the test suite
//   tear_down_tc:     pointer to the function that tears down the test suite
//   factory:          pointer to the factory that creates a test object.
//                     The newly created TestInfo instance will assume
//                     ownership of the factory object.
TestInfo* MakeAndRegisterTestInfo(
   const char* test_suite_name, const char* name, const char* type_param,
   const char* value_param, CodeLocation code_location,
   TypeId fixture_class_id, SetUpTestSuiteFunc set_up_tc,
   TearDownTestSuiteFunc tear_down_tc, TestFactoryBase* factory) {
 TestInfo* const test_info =
     new TestInfo(test_suite_name, name, type_param, value_param,
                  code_location, fixture_class_id, factory);
 GetUnitTestImpl()->AddTestInfo(set_up_tc, tear_down_tc, test_info);
 return test_info;
}

void ReportInvalidTestSuiteType(const char* test_suite_name,
                               CodeLocation code_location) {
 Message errors;
 errors
     << "Attempted redefinition of test suite " << test_suite_name << ".\n"
     << "All tests in the same test suite must use the same test fixture\n"
     << "class.  However, in test suite " << test_suite_name << ", you tried\n"
     << "to define a test using a fixture class different from the one\n"
     << "used earlier. This can happen if the two fixture classes are\n"
     << "from different namespaces and have the same name. You should\n"
     << "probably rename one of the classes to put the tests into different\n"
     << "test suites.";

 GTEST_LOG_(ERROR) << FormatFileLocation(code_location.file.c_str(),
                                         code_location.line)
                   << " " << errors.GetString();
}
}  // namespace internal

namespace {

// A predicate that checks the test name of a TestInfo against a known
// value.
//
// This is used for implementation of the TestSuite class only.  We put
// it in the anonymous namespace to prevent polluting the outer
// namespace.
//
// TestNameIs is copyable.
class TestNameIs {
public:
 // Constructor.
 //
 // TestNameIs has NO default constructor.
 explicit TestNameIs(const char* name)
     : name_(name) {}

 // Returns true if and only if the test name of test_info matches name_.
 bool operator()(const TestInfo * test_info) const {
   return test_info && test_info->name() == name_;
 }

private:
 std::string name_;
};

}  // namespace

namespace internal {

// This method expands all parameterized tests registered with macros TEST_P
// and INSTANTIATE_TEST_SUITE_P into regular tests and registers those.
// This will be done just once during the program runtime.
void UnitTestImpl::RegisterParameterizedTests() {
 if (!parameterized_tests_registered_) {
   parameterized_test_registry_.RegisterTests();
   type_parameterized_test_registry_.CheckForInstantiations();
   parameterized_tests_registered_ = true;
 }
}

}  // namespace internal

// Creates the test object, runs it, records its result, and then
// deletes it.
void TestInfo::Run() {
 if (!should_run_) return;

 // Tells UnitTest where to store test result.
 internal::UnitTestImpl* const impl = internal::GetUnitTestImpl();
 impl->set_current_test_info(this);

 TestEventListener* repeater = UnitTest::GetInstance()->listeners().repeater();

 // Notifies the unit test event listeners that a test is about to start.
 repeater->OnTestStart(*this);

 result_.set_start_timestamp(internal::GetTimeInMillis());
 internal::Timer timer;

 impl->os_stack_trace_getter()->UponLeavingGTest();

 // Creates the test object.
 Test* const test = internal::HandleExceptionsInMethodIfSupported(
     factory_, &internal::TestFactoryBase::CreateTest,
     "the test fixture's constructor");

 // Runs the test if the constructor didn't generate a fatal failure or invoke
 // GTEST_SKIP().
 // Note that the object will not be null
 if (!Test::HasFatalFailure() && !Test::IsSkipped()) {
   // This doesn't throw as all user code that can throw are wrapped into
   // exception handling code.
   test->Run();
 }

 if (test != nullptr) {
   // Deletes the test object.
   impl->os_stack_trace_getter()->UponLeavingGTest();
   internal::HandleExceptionsInMethodIfSupported(
       test, &Test::DeleteSelf_, "the test fixture's destructor");
 }

 result_.set_elapsed_time(timer.Elapsed());

 // Notifies the unit test event listener that a test has just finished.
 repeater->OnTestEnd(*this);

 // Tells UnitTest to stop associating assertion results to this
 // test.
 impl->set_current_test_info(nullptr);
}

// Skip and records a skipped test result for this object.
void TestInfo::Skip() {
 if (!should_run_) return;

 internal::UnitTestImpl* const impl = internal::GetUnitTestImpl();
 impl->set_current_test_info(this);

 TestEventListener* repeater = UnitTest::GetInstance()->listeners().repeater();

 // Notifies the unit test event listeners that a test is about to start.
 repeater->OnTestStart(*this);

 const TestPartResult test_part_result =
     TestPartResult(TestPartResult::kSkip, this->file(), this->line(), "");
 impl->GetTestPartResultReporterForCurrentThread()->ReportTestPartResult(
     test_part_result);

 // Notifies the unit test event listener that a test has just finished.
 repeater->OnTestEnd(*this);
 impl->set_current_test_info(nullptr);
}

// class TestSuite

// Gets the number of successful tests in this test suite.
int TestSuite::successful_test_count() const {
 return CountIf(test_info_list_, TestPassed);
}

// Gets the number of successful tests in this test suite.
int TestSuite::skipped_test_count() const {
 return CountIf(test_info_list_, TestSkipped);
}

// Gets the number of failed tests in this test suite.
int TestSuite::failed_test_count() const {
 return CountIf(test_info_list_, TestFailed);
}

// Gets the number of disabled tests that will be reported in the XML report.
int TestSuite::reportable_disabled_test_count() const {
 return CountIf(test_info_list_, TestReportableDisabled);
}

// Gets the number of disabled tests in this test suite.
int TestSuite::disabled_test_count() const {
 return CountIf(test_info_list_, TestDisabled);
}

// Gets the number of tests to be printed in the XML report.
int TestSuite::reportable_test_count() const {
 return CountIf(test_info_list_, TestReportable);
}

// Get the number of tests in this test suite that should run.
int TestSuite::test_to_run_count() const {
 return CountIf(test_info_list_, ShouldRunTest);
}

// Gets the number of all tests.
int TestSuite::total_test_count() const {
 return static_cast<int>(test_info_list_.size());
}

// Creates a TestSuite with the given name.
//
// Arguments:
//
//   a_name:       name of the test suite
//   a_type_param: the name of the test suite's type parameter, or NULL if
//                 this is not a typed or a type-parameterized test suite.
//   set_up_tc:    pointer to the function that sets up the test suite
//   tear_down_tc: pointer to the function that tears down the test suite
TestSuite::TestSuite(const char* a_name, const char* a_type_param,
                    internal::SetUpTestSuiteFunc set_up_tc,
                    internal::TearDownTestSuiteFunc tear_down_tc)
   : name_(a_name),
     type_param_(a_type_param ? new std::string(a_type_param) : nullptr),
     set_up_tc_(set_up_tc),
     tear_down_tc_(tear_down_tc),
     should_run_(false),
     start_timestamp_(0),
     elapsed_time_(0) {}

// Destructor of TestSuite.
TestSuite::~TestSuite() {
 // Deletes every Test in the collection.
 ForEach(test_info_list_, internal::Delete<TestInfo>);
}

// Returns the i-th test among all the tests. i can range from 0 to
// total_test_count() - 1. If i is not in that range, returns NULL.
const TestInfo* TestSuite::GetTestInfo(int i) const {
 const int index = GetElementOr(test_indices_, i, -1);
 return index < 0 ? nullptr : test_info_list_[static_cast<size_t>(index)];
}

// Returns the i-th test among all the tests. i can range from 0 to
// total_test_count() - 1. If i is not in that range, returns NULL.
TestInfo* TestSuite::GetMutableTestInfo(int i) {
 const int index = GetElementOr(test_indices_, i, -1);
 return index < 0 ? nullptr : test_info_list_[static_cast<size_t>(index)];
}

// Adds a test to this test suite.  Will delete the test upon
// destruction of the TestSuite object.
void TestSuite::AddTestInfo(TestInfo* test_info) {
 test_info_list_.push_back(test_info);
 test_indices_.push_back(static_cast<int>(test_indices_.size()));
}

// Runs every test in this TestSuite.
void TestSuite::Run() {
 if (!should_run_) return;

 internal::UnitTestImpl* const impl = internal::GetUnitTestImpl();
 impl->set_current_test_suite(this);

 TestEventListener* repeater = UnitTest::GetInstance()->listeners().repeater();

 // Call both legacy and the new API
 repeater->OnTestSuiteStart(*this);
//  Legacy API is deprecated but still available
#ifndef GTEST_REMOVE_LEGACY_TEST_CASEAPI_
 repeater->OnTestCaseStart(*this);
#endif  //  GTEST_REMOVE_LEGACY_TEST_CASEAPI_

 impl->os_stack_trace_getter()->UponLeavingGTest();
 internal::HandleExceptionsInMethodIfSupported(
     this, &TestSuite::RunSetUpTestSuite, "SetUpTestSuite()");

 start_timestamp_ = internal::GetTimeInMillis();
 internal::Timer timer;
 for (int i = 0; i < total_test_count(); i++) {
   GetMutableTestInfo(i)->Run();
   if (GTEST_FLAG(fail_fast) && GetMutableTestInfo(i)->result()->Failed()) {
     for (int j = i + 1; j < total_test_count(); j++) {
       GetMutableTestInfo(j)->Skip();
     }
     break;
   }
 }
 elapsed_time_ = timer.Elapsed();

 impl->os_stack_trace_getter()->UponLeavingGTest();
 internal::HandleExceptionsInMethodIfSupported(
     this, &TestSuite::RunTearDownTestSuite, "TearDownTestSuite()");

 // Call both legacy and the new API
 repeater->OnTestSuiteEnd(*this);
//  Legacy API is deprecated but still available
#ifndef GTEST_REMOVE_LEGACY_TEST_CASEAPI_
 repeater->OnTestCaseEnd(*this);
#endif  //  GTEST_REMOVE_LEGACY_TEST_CASEAPI_

 impl->set_current_test_suite(nullptr);
}

// Skips all tests under this TestSuite.
void TestSuite::Skip() {
 if (!should_run_) return;

 internal::UnitTestImpl* const impl = internal::GetUnitTestImpl();
 impl->set_current_test_suite(this);

 TestEventListener* repeater = UnitTest::GetInstance()->listeners().repeater();

 // Call both legacy and the new API
 repeater->OnTestSuiteStart(*this);
//  Legacy API is deprecated but still available
#ifndef GTEST_REMOVE_LEGACY_TEST_CASEAPI_
 repeater->OnTestCaseStart(*this);
#endif  //  GTEST_REMOVE_LEGACY_TEST_CASEAPI_

 for (int i = 0; i < total_test_count(); i++) {
   GetMutableTestInfo(i)->Skip();
 }

 // Call both legacy and the new API
 repeater->OnTestSuiteEnd(*this);
 // Legacy API is deprecated but still available
#ifndef GTEST_REMOVE_LEGACY_TEST_CASEAPI_
 repeater->OnTestCaseEnd(*this);
#endif  //  GTEST_REMOVE_LEGACY_TEST_CASEAPI_

 impl->set_current_test_suite(nullptr);
}

// Clears the results of all tests in this test suite.
void TestSuite::ClearResult() {
 ad_hoc_test_result_.Clear();
 ForEach(test_info_list_, TestInfo::ClearTestResult);
}

// Shuffles the tests in this test suite.
void TestSuite::ShuffleTests(internal::Random* random) {
 Shuffle(random, &test_indices_);
}

// Restores the test order to before the first shuffle.
void TestSuite::UnshuffleTests() {
 for (size_t i = 0; i < test_indices_.size(); i++) {
   test_indices_[i] = static_cast<int>(i);
 }
}

// Formats a countable noun.  Depending on its quantity, either the
// singular form or the plural form is used. e.g.
//
// FormatCountableNoun(1, "formula", "formuli") returns "1 formula".
// FormatCountableNoun(5, "book", "books") returns "5 books".
static std::string FormatCountableNoun(int count,
                                      const char * singular_form,
                                      const char * plural_form) {
 return internal::StreamableToString(count) + " " +
     (count == 1 ? singular_form : plural_form);
}

// Formats the count of tests.
static std::string FormatTestCount(int test_count) {
 return FormatCountableNoun(test_count, "test", "tests");
}

// Formats the count of test suites.
static std::string FormatTestSuiteCount(int test_suite_count) {
 return FormatCountableNoun(test_suite_count, "test suite", "test suites");
}

// Converts a TestPartResult::Type enum to human-friendly string
// representation.  Both kNonFatalFailure and kFatalFailure are translated
// to "Failure", as the user usually doesn't care about the difference
// between the two when viewing the test result.
static const char * TestPartResultTypeToString(TestPartResult::Type type) {
 switch (type) {
   case TestPartResult::kSkip:
     return "Skipped\n";
   case TestPartResult::kSuccess:
     return "Success";

   case TestPartResult::kNonFatalFailure:
   case TestPartResult::kFatalFailure:
#ifdef _MSC_VER
     return "error: ";
#else
     return "Failure\n";
#endif
   default:
     return "Unknown result type";
 }
}

namespace internal {
namespace {
enum class GTestColor { kDefault, kRed, kGreen, kYellow };
}  // namespace

// Prints a TestPartResult to an std::string.
static std::string PrintTestPartResultToString(
   const TestPartResult& test_part_result) {
 return (Message()
         << internal::FormatFileLocation(test_part_result.file_name(),
                                         test_part_result.line_number())
         << " " << TestPartResultTypeToString(test_part_result.type())
         << test_part_result.message()).GetString();
}

// Prints a TestPartResult.
static void PrintTestPartResult(const TestPartResult& test_part_result) {
 const std::string& result =
     PrintTestPartResultToString(test_part_result);
 printf("%s\n", result.c_str());
 fflush(stdout);
 // If the test program runs in Visual Studio or a debugger, the
 // following statements add the test part result message to the Output
 // window such that the user can double-click on it to jump to the
 // corresponding source code location; otherwise they do nothing.
#if GTEST_OS_WINDOWS && !GTEST_OS_WINDOWS_MOBILE
 // We don't call OutputDebugString*() on Windows Mobile, as printing
 // to stdout is done by OutputDebugString() there already - we don't
 // want the same message printed twice.
 ::OutputDebugStringA(result.c_str());
 ::OutputDebugStringA("\n");
#endif
}

// class PrettyUnitTestResultPrinter
#if GTEST_OS_WINDOWS && !GTEST_OS_WINDOWS_MOBILE && \
   !GTEST_OS_WINDOWS_PHONE && !GTEST_OS_WINDOWS_RT && !GTEST_OS_WINDOWS_MINGW

// Returns the character attribute for the given color.
static WORD GetColorAttribute(GTestColor color) {
 switch (color) {
   case GTestColor::kRed:
     return FOREGROUND_RED;
   case GTestColor::kGreen:
     return FOREGROUND_GREEN;
   case GTestColor::kYellow:
     return FOREGROUND_RED | FOREGROUND_GREEN;
   default:           return 0;
 }
}

static int GetBitOffset(WORD color_mask) {
 if (color_mask == 0) return 0;

 int bitOffset = 0;
 while ((color_mask & 1) == 0) {
   color_mask >>= 1;
   ++bitOffset;
 }
 return bitOffset;
}

static WORD GetNewColor(GTestColor color, WORD old_color_attrs) {
 // Let's reuse the BG
 static const WORD background_mask = BACKGROUND_BLUE | BACKGROUND_GREEN |
                                     BACKGROUND_RED | BACKGROUND_INTENSITY;
 static const WORD foreground_mask = FOREGROUND_BLUE | FOREGROUND_GREEN |
                                     FOREGROUND_RED | FOREGROUND_INTENSITY;
 const WORD existing_bg = old_color_attrs & background_mask;

 WORD new_color =
     GetColorAttribute(color) | existing_bg | FOREGROUND_INTENSITY;
 static const int bg_bitOffset = GetBitOffset(background_mask);
 static const int fg_bitOffset = GetBitOffset(foreground_mask);

 if (((new_color & background_mask) >> bg_bitOffset) ==
     ((new_color & foreground_mask) >> fg_bitOffset)) {
   new_color ^= FOREGROUND_INTENSITY;  // invert intensity
 }
 return new_color;
}

#else

// Returns the ANSI color code for the given color. GTestColor::kDefault is
// an invalid input.
static const char* GetAnsiColorCode(GTestColor color) {
 switch (color) {
   case GTestColor::kRed:
     return "1";
   case GTestColor::kGreen:
     return "2";
   case GTestColor::kYellow:
     return "3";
   default:
     return nullptr;
 }
}

#endif  // GTEST_OS_WINDOWS && !GTEST_OS_WINDOWS_MOBILE

// Returns true if and only if Google Test should use colors in the output.
bool ShouldUseColor(bool stdout_is_tty) {
 const char* const gtest_color = GTEST_FLAG(color).c_str();

 if (String::CaseInsensitiveCStringEquals(gtest_color, "auto")) {
#if GTEST_OS_WINDOWS && !GTEST_OS_WINDOWS_MINGW
   // On Windows the TERM variable is usually not set, but the
   // console there does support colors.
   return stdout_is_tty;
#else
   // On non-Windows platforms, we rely on the TERM variable.
   const char* const term = posix::GetEnv("TERM");
   const bool term_supports_color =
       String::CStringEquals(term, "xterm") ||
       String::CStringEquals(term, "xterm-color") ||
       String::CStringEquals(term, "xterm-256color") ||
       String::CStringEquals(term, "screen") ||
       String::CStringEquals(term, "screen-256color") ||
       String::CStringEquals(term, "tmux") ||
       String::CStringEquals(term, "tmux-256color") ||
       String::CStringEquals(term, "rxvt-unicode") ||
       String::CStringEquals(term, "rxvt-unicode-256color") ||
       String::CStringEquals(term, "linux") ||
       String::CStringEquals(term, "cygwin");
   return stdout_is_tty && term_supports_color;
#endif  // GTEST_OS_WINDOWS
 }

 return String::CaseInsensitiveCStringEquals(gtest_color, "yes") ||
     String::CaseInsensitiveCStringEquals(gtest_color, "true") ||
     String::CaseInsensitiveCStringEquals(gtest_color, "t") ||
     String::CStringEquals(gtest_color, "1");
 // We take "yes", "true", "t", and "1" as meaning "yes".  If the
 // value is neither one of these nor "auto", we treat it as "no" to
 // be conservative.
}

// Helpers for printing colored strings to stdout. Note that on Windows, we
// cannot simply emit special characters and have the terminal change colors.
// This routine must actually emit the characters rather than return a string
// that would be colored when printed, as can be done on Linux.

GTEST_ATTRIBUTE_PRINTF_(2, 3)
static void ColoredPrintf(GTestColor color, const char *fmt, ...) {
 va_list args;
 va_start(args, fmt);

#if GTEST_OS_WINDOWS_MOBILE || GTEST_OS_ZOS || GTEST_OS_IOS || \
   GTEST_OS_WINDOWS_PHONE || GTEST_OS_WINDOWS_RT || defined(ESP_PLATFORM)
 const bool use_color = AlwaysFalse();
#else
 static const bool in_color_mode =
     ShouldUseColor(posix::IsATTY(posix::FileNo(stdout)) != 0);
 const bool use_color = in_color_mode && (color != GTestColor::kDefault);
#endif  // GTEST_OS_WINDOWS_MOBILE || GTEST_OS_ZOS

 if (!use_color) {
   vprintf(fmt, args);
   va_end(args);
   return;
 }

#if GTEST_OS_WINDOWS && !GTEST_OS_WINDOWS_MOBILE && \
   !GTEST_OS_WINDOWS_PHONE && !GTEST_OS_WINDOWS_RT && !GTEST_OS_WINDOWS_MINGW
 const HANDLE stdout_handle = GetStdHandle(STD_OUTPUT_HANDLE);

 // Gets the current text color.
 CONSOLE_SCREEN_BUFFER_INFO buffer_info;
 GetConsoleScreenBufferInfo(stdout_handle, &buffer_info);
 const WORD old_color_attrs = buffer_info.wAttributes;
 const WORD new_color = GetNewColor(color, old_color_attrs);

 // We need to flush the stream buffers into the console before each
 // SetConsoleTextAttribute call lest it affect the text that is already
 // printed but has not yet reached the console.
 fflush(stdout);
 SetConsoleTextAttribute(stdout_handle, new_color);

 vprintf(fmt, args);

 fflush(stdout);
 // Restores the text color.
 SetConsoleTextAttribute(stdout_handle, old_color_attrs);
#else
 printf("\033[0;3%sm", GetAnsiColorCode(color));
 vprintf(fmt, args);
 printf("\033[m");  // Resets the terminal to default.
#endif  // GTEST_OS_WINDOWS && !GTEST_OS_WINDOWS_MOBILE
 va_end(args);
}

// Text printed in Google Test's text output and --gtest_list_tests
// output to label the type parameter and value parameter for a test.
static const char kTypeParamLabel[] = "TypeParam";
static const char kValueParamLabel[] = "GetParam()";

static void PrintFullTestCommentIfPresent(const TestInfo& test_info) {
 const char* const type_param = test_info.type_param();
 const char* const value_param = test_info.value_param();

 if (type_param != nullptr || value_param != nullptr) {
   printf(", where ");
   if (type_param != nullptr) {
     printf("%s = %s", kTypeParamLabel, type_param);
     if (value_param != nullptr) printf(" and ");
   }
   if (value_param != nullptr) {
     printf("%s = %s", kValueParamLabel, value_param);
   }
 }
}

// This class implements the TestEventListener interface.
//
// Class PrettyUnitTestResultPrinter is copyable.
class PrettyUnitTestResultPrinter : public TestEventListener {
public:
 PrettyUnitTestResultPrinter() {}
 static void PrintTestName(const char* test_suite, const char* test) {
   printf("%s.%s", test_suite, test);
 }

 // The following methods override what's in the TestEventListener class.
 void OnTestProgramStart(const UnitTest& /*unit_test*/) override {}
 void OnTestIterationStart(const UnitTest& unit_test, int iteration) override;
 void OnEnvironmentsSetUpStart(const UnitTest& unit_test) override;
 void OnEnvironmentsSetUpEnd(const UnitTest& /*unit_test*/) override {}
#ifndef GTEST_REMOVE_LEGACY_TEST_CASEAPI_
 void OnTestCaseStart(const TestCase& test_case) override;
#else
 void OnTestSuiteStart(const TestSuite& test_suite) override;
#endif  // OnTestCaseStart

 void OnTestStart(const TestInfo& test_info) override;

 void OnTestPartResult(const TestPartResult& result) override;
 void OnTestEnd(const TestInfo& test_info) override;
#ifndef GTEST_REMOVE_LEGACY_TEST_CASEAPI_
 void OnTestCaseEnd(const TestCase& test_case) override;
#else
 void OnTestSuiteEnd(const TestSuite& test_suite) override;
#endif  // GTEST_REMOVE_LEGACY_TEST_CASEAPI_

 void OnEnvironmentsTearDownStart(const UnitTest& unit_test) override;
 void OnEnvironmentsTearDownEnd(const UnitTest& /*unit_test*/) override {}
 void OnTestIterationEnd(const UnitTest& unit_test, int iteration) override;
 void OnTestProgramEnd(const UnitTest& /*unit_test*/) override {}

private:
 static void PrintFailedTests(const UnitTest& unit_test);
 static void PrintFailedTestSuites(const UnitTest& unit_test);
 static void PrintSkippedTests(const UnitTest& unit_test);
};

 // Fired before each iteration of tests starts.
void PrettyUnitTestResultPrinter::OnTestIterationStart(
   const UnitTest& unit_test, int iteration) {
 if (GTEST_FLAG(repeat) != 1)
   printf("\nRepeating all tests (iteration %d) . . .\n\n", iteration + 1);

 const char* const filter = GTEST_FLAG(filter).c_str();

 // Prints the filter if it's not *.  This reminds the user that some
 // tests may be skipped.
 if (!String::CStringEquals(filter, kUniversalFilter)) {
   ColoredPrintf(GTestColor::kYellow, "Note: %s filter = %s\n", GTEST_NAME_,
                 filter);
 }

 if (internal::ShouldShard(kTestTotalShards, kTestShardIndex, false)) {
   const int32_t shard_index = Int32FromEnvOrDie(kTestShardIndex, -1);
   ColoredPrintf(GTestColor::kYellow, "Note: This is test shard %d of %s.\n",
                 static_cast<int>(shard_index) + 1,
                 internal::posix::GetEnv(kTestTotalShards));
 }

 if (GTEST_FLAG(shuffle)) {
   ColoredPrintf(GTestColor::kYellow,
                 "Note: Randomizing tests' orders with a seed of %d .\n",
                 unit_test.random_seed());
 }

 ColoredPrintf(GTestColor::kGreen, "[==========] ");
 printf("Running %s from %s.\n",
        FormatTestCount(unit_test.test_to_run_count()).c_str(),
        FormatTestSuiteCount(unit_test.test_suite_to_run_count()).c_str());
 fflush(stdout);
}

void PrettyUnitTestResultPrinter::OnEnvironmentsSetUpStart(
   const UnitTest& /*unit_test*/) {
 ColoredPrintf(GTestColor::kGreen, "[----------] ");
 printf("Global test environment set-up.\n");
 fflush(stdout);
}

#ifndef GTEST_REMOVE_LEGACY_TEST_CASEAPI_
void PrettyUnitTestResultPrinter::OnTestCaseStart(const TestCase& test_case) {
 const std::string counts =
     FormatCountableNoun(test_case.test_to_run_count(), "test", "tests");
 ColoredPrintf(GTestColor::kGreen, "[----------] ");
 printf("%s from %s", counts.c_str(), test_case.name());
 if (test_case.type_param() == nullptr) {
   printf("\n");
 } else {
   printf(", where %s = %s\n", kTypeParamLabel, test_case.type_param());
 }
 fflush(stdout);
}
#else
void PrettyUnitTestResultPrinter::OnTestSuiteStart(
   const TestSuite& test_suite) {
 const std::string counts =
     FormatCountableNoun(test_suite.test_to_run_count(), "test", "tests");
 ColoredPrintf(GTestColor::kGreen, "[----------] ");
 printf("%s from %s", counts.c_str(), test_suite.name());
 if (test_suite.type_param() == nullptr) {
   printf("\n");
 } else {
   printf(", where %s = %s\n", kTypeParamLabel, test_suite.type_param());
 }
 fflush(stdout);
}
#endif  // GTEST_REMOVE_LEGACY_TEST_CASEAPI_

void PrettyUnitTestResultPrinter::OnTestStart(const TestInfo& test_info) {
 ColoredPrintf(GTestColor::kGreen, "[ RUN      ] ");
 PrintTestName(test_info.test_suite_name(), test_info.name());
 printf("\n");
 fflush(stdout);
}

// Called after an assertion failure.
void PrettyUnitTestResultPrinter::OnTestPartResult(
   const TestPartResult& result) {
 switch (result.type()) {
   // If the test part succeeded, we don't need to do anything.
   case TestPartResult::kSuccess:
     return;
   default:
     // Print failure message from the assertion
     // (e.g. expected this and got that).
     PrintTestPartResult(result);
     fflush(stdout);
 }
}

void PrettyUnitTestResultPrinter::OnTestEnd(const TestInfo& test_info) {
 if (test_info.result()->Passed()) {
   ColoredPrintf(GTestColor::kGreen, "[       OK ] ");
 } else if (test_info.result()->Skipped()) {
   ColoredPrintf(GTestColor::kGreen, "[  SKIPPED ] ");
 } else {
   ColoredPrintf(GTestColor::kRed, "[  FAILED  ] ");
 }
 PrintTestName(test_info.test_suite_name(), test_info.name());
 if (test_info.result()->Failed())
   PrintFullTestCommentIfPresent(test_info);

 if (GTEST_FLAG(print_time)) {
   printf(" (%s ms)\n", internal::StreamableToString(
          test_info.result()->elapsed_time()).c_str());
 } else {
   printf("\n");
 }
 fflush(stdout);
}

#ifndef GTEST_REMOVE_LEGACY_TEST_CASEAPI_
void PrettyUnitTestResultPrinter::OnTestCaseEnd(const TestCase& test_case) {
 if (!GTEST_FLAG(print_time)) return;

 const std::string counts =
     FormatCountableNoun(test_case.test_to_run_count(), "test", "tests");
 ColoredPrintf(GTestColor::kGreen, "[----------] ");
 printf("%s from %s (%s ms total)\n\n", counts.c_str(), test_case.name(),
        internal::StreamableToString(test_case.elapsed_time()).c_str());
 fflush(stdout);
}
#else
void PrettyUnitTestResultPrinter::OnTestSuiteEnd(const TestSuite& test_suite) {
 if (!GTEST_FLAG(print_time)) return;

 const std::string counts =
     FormatCountableNoun(test_suite.test_to_run_count(), "test", "tests");
 ColoredPrintf(GTestColor::kGreen, "[----------] ");
 printf("%s from %s (%s ms total)\n\n", counts.c_str(), test_suite.name(),
        internal::StreamableToString(test_suite.elapsed_time()).c_str());
 fflush(stdout);
}
#endif  // GTEST_REMOVE_LEGACY_TEST_CASEAPI_

void PrettyUnitTestResultPrinter::OnEnvironmentsTearDownStart(
   const UnitTest& /*unit_test*/) {
 ColoredPrintf(GTestColor::kGreen, "[----------] ");
 printf("Global test environment tear-down\n");
 fflush(stdout);
}

// Internal helper for printing the list of failed tests.
void PrettyUnitTestResultPrinter::PrintFailedTests(const UnitTest& unit_test) {
 const int failed_test_count = unit_test.failed_test_count();
 ColoredPrintf(GTestColor::kRed, "[  FAILED  ] ");
 printf("%s, listed below:\n", FormatTestCount(failed_test_count).c_str());

 for (int i = 0; i < unit_test.total_test_suite_count(); ++i) {
   const TestSuite& test_suite = *unit_test.GetTestSuite(i);
   if (!test_suite.should_run() || (test_suite.failed_test_count() == 0)) {
     continue;
   }
   for (int j = 0; j < test_suite.total_test_count(); ++j) {
     const TestInfo& test_info = *test_suite.GetTestInfo(j);
     if (!test_info.should_run() || !test_info.result()->Failed()) {
       continue;
     }
     ColoredPrintf(GTestColor::kRed, "[  FAILED  ] ");
     printf("%s.%s", test_suite.name(), test_info.name());
     PrintFullTestCommentIfPresent(test_info);
     printf("\n");
   }
 }
 printf("\n%2d FAILED %s\n", failed_test_count,
        failed_test_count == 1 ? "TEST" : "TESTS");
}

// Internal helper for printing the list of test suite failures not covered by
// PrintFailedTests.
void PrettyUnitTestResultPrinter::PrintFailedTestSuites(
   const UnitTest& unit_test) {
 int suite_failure_count = 0;
 for (int i = 0; i < unit_test.total_test_suite_count(); ++i) {
   const TestSuite& test_suite = *unit_test.GetTestSuite(i);
   if (!test_suite.should_run()) {
     continue;
   }
   if (test_suite.ad_hoc_test_result().Failed()) {
     ColoredPrintf(GTestColor::kRed, "[  FAILED  ] ");
     printf("%s: SetUpTestSuite or TearDownTestSuite\n", test_suite.name());
     ++suite_failure_count;
   }
 }
 if (suite_failure_count > 0) {
   printf("\n%2d FAILED TEST %s\n", suite_failure_count,
          suite_failure_count == 1 ? "SUITE" : "SUITES");
 }
}

// Internal helper for printing the list of skipped tests.
void PrettyUnitTestResultPrinter::PrintSkippedTests(const UnitTest& unit_test) {
 const int skipped_test_count = unit_test.skipped_test_count();
 if (skipped_test_count == 0) {
   return;
 }

 for (int i = 0; i < unit_test.total_test_suite_count(); ++i) {
   const TestSuite& test_suite = *unit_test.GetTestSuite(i);
   if (!test_suite.should_run() || (test_suite.skipped_test_count() == 0)) {
     continue;
   }
   for (int j = 0; j < test_suite.total_test_count(); ++j) {
     const TestInfo& test_info = *test_suite.GetTestInfo(j);
     if (!test_info.should_run() || !test_info.result()->Skipped()) {
       continue;
     }
     ColoredPrintf(GTestColor::kGreen, "[  SKIPPED ] ");
     printf("%s.%s", test_suite.name(), test_info.name());
     printf("\n");
   }
 }
}

void PrettyUnitTestResultPrinter::OnTestIterationEnd(const UnitTest& unit_test,
                                                    int /*iteration*/) {
 ColoredPrintf(GTestColor::kGreen, "[==========] ");
 printf("%s from %s ran.",
        FormatTestCount(unit_test.test_to_run_count()).c_str(),
        FormatTestSuiteCount(unit_test.test_suite_to_run_count()).c_str());
 if (GTEST_FLAG(print_time)) {
   printf(" (%s ms total)",
          internal::StreamableToString(unit_test.elapsed_time()).c_str());
 }
 printf("\n");
 ColoredPrintf(GTestColor::kGreen, "[  PASSED  ] ");
 printf("%s.\n", FormatTestCount(unit_test.successful_test_count()).c_str());

 const int skipped_test_count = unit_test.skipped_test_count();
 if (skipped_test_count > 0) {
   ColoredPrintf(GTestColor::kGreen, "[  SKIPPED ] ");
   printf("%s, listed below:\n", FormatTestCount(skipped_test_count).c_str());
   PrintSkippedTests(unit_test);
 }

 if (!unit_test.Passed()) {
   PrintFailedTests(unit_test);
   PrintFailedTestSuites(unit_test);
 }

 int num_disabled = unit_test.reportable_disabled_test_count();
 if (num_disabled && !GTEST_FLAG(also_run_disabled_tests)) {
   if (unit_test.Passed()) {
     printf("\n");  // Add a spacer if no FAILURE banner is displayed.
   }
   ColoredPrintf(GTestColor::kYellow, "  YOU HAVE %d DISABLED %s\n\n",
                 num_disabled, num_disabled == 1 ? "TEST" : "TESTS");
 }
 // Ensure that Google Test output is printed before, e.g., heapchecker output.
 fflush(stdout);
}

// End PrettyUnitTestResultPrinter

// This class implements the TestEventListener interface.
//
// Class BriefUnitTestResultPrinter is copyable.
class BriefUnitTestResultPrinter : public TestEventListener {
public:
 BriefUnitTestResultPrinter() {}
 static void PrintTestName(const char* test_suite, const char* test) {
   printf("%s.%s", test_suite, test);
 }

 // The following methods override what's in the TestEventListener class.
 void OnTestProgramStart(const UnitTest& /*unit_test*/) override {}
 void OnTestIterationStart(const UnitTest& /*unit_test*/,
                           int /*iteration*/) override {}
 void OnEnvironmentsSetUpStart(const UnitTest& /*unit_test*/) override {}
 void OnEnvironmentsSetUpEnd(const UnitTest& /*unit_test*/) override {}
#ifndef GTEST_REMOVE_LEGACY_TEST_CASEAPI_
 void OnTestCaseStart(const TestCase& /*test_case*/) override {}
#else
 void OnTestSuiteStart(const TestSuite& /*test_suite*/) override {}
#endif  // OnTestCaseStart

 void OnTestStart(const TestInfo& /*test_info*/) override {}

 void OnTestPartResult(const TestPartResult& result) override;
 void OnTestEnd(const TestInfo& test_info) override;
#ifndef GTEST_REMOVE_LEGACY_TEST_CASEAPI_
 void OnTestCaseEnd(const TestCase& /*test_case*/) override {}
#else
 void OnTestSuiteEnd(const TestSuite& /*test_suite*/) override {}
#endif  // GTEST_REMOVE_LEGACY_TEST_CASEAPI_

 void OnEnvironmentsTearDownStart(const UnitTest& /*unit_test*/) override {}
 void OnEnvironmentsTearDownEnd(const UnitTest& /*unit_test*/) override {}
 void OnTestIterationEnd(const UnitTest& unit_test, int iteration) override;
 void OnTestProgramEnd(const UnitTest& /*unit_test*/) override {}
};

// Called after an assertion failure.
void BriefUnitTestResultPrinter::OnTestPartResult(
   const TestPartResult& result) {
 switch (result.type()) {
   // If the test part succeeded, we don't need to do anything.
   case TestPartResult::kSuccess:
     return;
   default:
     // Print failure message from the assertion
     // (e.g. expected this and got that).
     PrintTestPartResult(result);
     fflush(stdout);
 }
}

void BriefUnitTestResultPrinter::OnTestEnd(const TestInfo& test_info) {
 if (test_info.result()->Failed()) {
   ColoredPrintf(GTestColor::kRed, "[  FAILED  ] ");
   PrintTestName(test_info.test_suite_name(), test_info.name());
   PrintFullTestCommentIfPresent(test_info);

   if (GTEST_FLAG(print_time)) {
     printf(" (%s ms)\n",
            internal::StreamableToString(test_info.result()->elapsed_time())
                .c_str());
   } else {
     printf("\n");
   }
   fflush(stdout);
 }
}

void BriefUnitTestResultPrinter::OnTestIterationEnd(const UnitTest& unit_test,
                                                   int /*iteration*/) {
 ColoredPrintf(GTestColor::kGreen, "[==========] ");
 printf("%s from %s ran.",
        FormatTestCount(unit_test.test_to_run_count()).c_str(),
        FormatTestSuiteCount(unit_test.test_suite_to_run_count()).c_str());
 if (GTEST_FLAG(print_time)) {
   printf(" (%s ms total)",
          internal::StreamableToString(unit_test.elapsed_time()).c_str());
 }
 printf("\n");
 ColoredPrintf(GTestColor::kGreen, "[  PASSED  ] ");
 printf("%s.\n", FormatTestCount(unit_test.successful_test_count()).c_str());

 const int skipped_test_count = unit_test.skipped_test_count();
 if (skipped_test_count > 0) {
   ColoredPrintf(GTestColor::kGreen, "[  SKIPPED ] ");
   printf("%s.\n", FormatTestCount(skipped_test_count).c_str());
 }

 int num_disabled = unit_test.reportable_disabled_test_count();
 if (num_disabled && !GTEST_FLAG(also_run_disabled_tests)) {
   if (unit_test.Passed()) {
     printf("\n");  // Add a spacer if no FAILURE banner is displayed.
   }
   ColoredPrintf(GTestColor::kYellow, "  YOU HAVE %d DISABLED %s\n\n",
                 num_disabled, num_disabled == 1 ? "TEST" : "TESTS");
 }
 // Ensure that Google Test output is printed before, e.g., heapchecker output.
 fflush(stdout);
}

// End BriefUnitTestResultPrinter

// class TestEventRepeater
//
// This class forwards events to other event listeners.
class TestEventRepeater : public TestEventListener {
public:
 TestEventRepeater() : forwarding_enabled_(true) {}
 ~TestEventRepeater() override;
 void Append(TestEventListener *listener);
 TestEventListener* Release(TestEventListener* listener);

 // Controls whether events will be forwarded to listeners_. Set to false
 // in death test child processes.
 bool forwarding_enabled() const { return forwarding_enabled_; }
 void set_forwarding_enabled(bool enable) { forwarding_enabled_ = enable; }

 void OnTestProgramStart(const UnitTest& unit_test) override;
 void OnTestIterationStart(const UnitTest& unit_test, int iteration) override;
 void OnEnvironmentsSetUpStart(const UnitTest& unit_test) override;
 void OnEnvironmentsSetUpEnd(const UnitTest& unit_test) override;
//  Legacy API is deprecated but still available
#ifndef GTEST_REMOVE_LEGACY_TEST_CASEAPI_
 void OnTestCaseStart(const TestSuite& parameter) override;
#endif  //  GTEST_REMOVE_LEGACY_TEST_CASEAPI_
 void OnTestSuiteStart(const TestSuite& parameter) override;
 void OnTestStart(const TestInfo& test_info) override;
 void OnTestPartResult(const TestPartResult& result) override;
 void OnTestEnd(const TestInfo& test_info) override;
//  Legacy API is deprecated but still available
#ifndef GTEST_REMOVE_LEGACY_TEST_CASEAPI_
 void OnTestCaseEnd(const TestCase& parameter) override;
#endif  //  GTEST_REMOVE_LEGACY_TEST_CASEAPI_
 void OnTestSuiteEnd(const TestSuite& parameter) override;
 void OnEnvironmentsTearDownStart(const UnitTest& unit_test) override;
 void OnEnvironmentsTearDownEnd(const UnitTest& unit_test) override;
 void OnTestIterationEnd(const UnitTest& unit_test, int iteration) override;
 void OnTestProgramEnd(const UnitTest& unit_test) override;

private:
 // Controls whether events will be forwarded to listeners_. Set to false
 // in death test child processes.
 bool forwarding_enabled_;
 // The list of listeners that receive events.
 std::vector<TestEventListener*> listeners_;

 GTEST_DISALLOW_COPY_AND_ASSIGN_(TestEventRepeater);
};

TestEventRepeater::~TestEventRepeater() {
 ForEach(listeners_, Delete<TestEventListener>);
}

void TestEventRepeater::Append(TestEventListener *listener) {
 listeners_.push_back(listener);
}

TestEventListener* TestEventRepeater::Release(TestEventListener *listener) {
 for (size_t i = 0; i < listeners_.size(); ++i) {
   if (listeners_[i] == listener) {
     listeners_.erase(listeners_.begin() + static_cast<int>(i));
     return listener;
   }
 }

 return nullptr;
}

// Since most methods are very similar, use macros to reduce boilerplate.
// This defines a member that forwards the call to all listeners.
#define GTEST_REPEATER_METHOD_(Name, Type) \
void TestEventRepeater::Name(const Type& parameter) { \
 if (forwarding_enabled_) { \
   for (size_t i = 0; i < listeners_.size(); i++) { \
     listeners_[i]->Name(parameter); \
   } \
 } \
}
// This defines a member that forwards the call to all listeners in reverse
// order.
#define GTEST_REVERSE_REPEATER_METHOD_(Name, Type)      \
 void TestEventRepeater::Name(const Type& parameter) { \
   if (forwarding_enabled_) {                          \
     for (size_t i = listeners_.size(); i != 0; i--) { \
       listeners_[i - 1]->Name(parameter);             \
     }                                                 \
   }                                                   \
 }

GTEST_REPEATER_METHOD_(OnTestProgramStart, UnitTest)
GTEST_REPEATER_METHOD_(OnEnvironmentsSetUpStart, UnitTest)
//  Legacy API is deprecated but still available
#ifndef GTEST_REMOVE_LEGACY_TEST_CASEAPI_
GTEST_REPEATER_METHOD_(OnTestCaseStart, TestSuite)
#endif  //  GTEST_REMOVE_LEGACY_TEST_CASEAPI_
GTEST_REPEATER_METHOD_(OnTestSuiteStart, TestSuite)
GTEST_REPEATER_METHOD_(OnTestStart, TestInfo)
GTEST_REPEATER_METHOD_(OnTestPartResult, TestPartResult)
GTEST_REPEATER_METHOD_(OnEnvironmentsTearDownStart, UnitTest)
GTEST_REVERSE_REPEATER_METHOD_(OnEnvironmentsSetUpEnd, UnitTest)
GTEST_REVERSE_REPEATER_METHOD_(OnEnvironmentsTearDownEnd, UnitTest)
GTEST_REVERSE_REPEATER_METHOD_(OnTestEnd, TestInfo)
//  Legacy API is deprecated but still available
#ifndef GTEST_REMOVE_LEGACY_TEST_CASEAPI_
GTEST_REVERSE_REPEATER_METHOD_(OnTestCaseEnd, TestSuite)
#endif  //  GTEST_REMOVE_LEGACY_TEST_CASEAPI_
GTEST_REVERSE_REPEATER_METHOD_(OnTestSuiteEnd, TestSuite)
GTEST_REVERSE_REPEATER_METHOD_(OnTestProgramEnd, UnitTest)

#undef GTEST_REPEATER_METHOD_
#undef GTEST_REVERSE_REPEATER_METHOD_

void TestEventRepeater::OnTestIterationStart(const UnitTest& unit_test,
                                            int iteration) {
 if (forwarding_enabled_) {
   for (size_t i = 0; i < listeners_.size(); i++) {
     listeners_[i]->OnTestIterationStart(unit_test, iteration);
   }
 }
}

void TestEventRepeater::OnTestIterationEnd(const UnitTest& unit_test,
                                          int iteration) {
 if (forwarding_enabled_) {
   for (size_t i = listeners_.size(); i > 0; i--) {
     listeners_[i - 1]->OnTestIterationEnd(unit_test, iteration);
   }
 }
}

// End TestEventRepeater

// This class generates an XML output file.
class XmlUnitTestResultPrinter : public EmptyTestEventListener {
public:
 explicit XmlUnitTestResultPrinter(const char* output_file);

 void OnTestIterationEnd(const UnitTest& unit_test, int iteration) override;
 void ListTestsMatchingFilter(const std::vector<TestSuite*>& test_suites);

 // Prints an XML summary of all unit tests.
 static void PrintXmlTestsList(std::ostream* stream,
                               const std::vector<TestSuite*>& test_suites);

private:
 // Is c a whitespace character that is normalized to a space character
 // when it appears in an XML attribute value?
 static bool IsNormalizableWhitespace(char c) {
   return c == 0x9 || c == 0xA || c == 0xD;
 }

 // May c appear in a well-formed XML document?
 static bool IsValidXmlCharacter(char c) {
   return IsNormalizableWhitespace(c) || c >= 0x20;
 }

 // Returns an XML-escaped copy of the input string str.  If
 // is_attribute is true, the text is meant to appear as an attribute
 // value, and normalizable whitespace is preserved by replacing it
 // with character references.
 static std::string EscapeXml(const std::string& str, bool is_attribute);

 // Returns the given string with all characters invalid in XML removed.
 static std::string RemoveInvalidXmlCharacters(const std::string& str);

 // Convenience wrapper around EscapeXml when str is an attribute value.
 static std::string EscapeXmlAttribute(const std::string& str) {
   return EscapeXml(str, true);
 }

 // Convenience wrapper around EscapeXml when str is not an attribute value.
 static std::string EscapeXmlText(const char* str) {
   return EscapeXml(str, false);
 }

 // Verifies that the given attribute belongs to the given element and
 // streams the attribute as XML.
 static void OutputXmlAttribute(std::ostream* stream,
                                const std::string& element_name,
                                const std::string& name,
                                const std::string& value);

 // Streams an XML CDATA section, escaping invalid CDATA sequences as needed.
 static void OutputXmlCDataSection(::std::ostream* stream, const char* data);

 // Streams a test suite XML stanza containing the given test result.
 //
 // Requires: result.Failed()
 static void OutputXmlTestSuiteForTestResult(::std::ostream* stream,
                                             const TestResult& result);

 // Streams an XML representation of a TestResult object.
 static void OutputXmlTestResult(::std::ostream* stream,
                                 const TestResult& result);

 // Streams an XML representation of a TestInfo object.
 static void OutputXmlTestInfo(::std::ostream* stream,
                               const char* test_suite_name,
                               const TestInfo& test_info);

 // Prints an XML representation of a TestSuite object
 static void PrintXmlTestSuite(::std::ostream* stream,
                               const TestSuite& test_suite);

 // Prints an XML summary of unit_test to output stream out.
 static void PrintXmlUnitTest(::std::ostream* stream,
                              const UnitTest& unit_test);

 // Produces a string representing the test properties in a result as space
 // delimited XML attributes based on the property key="value" pairs.
 // When the std::string is not empty, it includes a space at the beginning,
 // to delimit this attribute from prior attributes.
 static std::string TestPropertiesAsXmlAttributes(const TestResult& result);

 // Streams an XML representation of the test properties of a TestResult
 // object.
 static void OutputXmlTestProperties(std::ostream* stream,
                                     const TestResult& result);

 // The output file.
 const std::string output_file_;

 GTEST_DISALLOW_COPY_AND_ASSIGN_(XmlUnitTestResultPrinter);
};

// Creates a new XmlUnitTestResultPrinter.
XmlUnitTestResultPrinter::XmlUnitTestResultPrinter(const char* output_file)
   : output_file_(output_file) {
 if (output_file_.empty()) {
   GTEST_LOG_(FATAL) << "XML output file may not be null";
 }
}

// Called after the unit test ends.
void XmlUnitTestResultPrinter::OnTestIterationEnd(const UnitTest& unit_test,
                                                 int /*iteration*/) {
 FILE* xmlout = OpenFileForWriting(output_file_);
 std::stringstream stream;
 PrintXmlUnitTest(&stream, unit_test);
 fprintf(xmlout, "%s", StringStreamToString(&stream).c_str());
 fclose(xmlout);
}

void XmlUnitTestResultPrinter::ListTestsMatchingFilter(
   const std::vector<TestSuite*>& test_suites) {
 FILE* xmlout = OpenFileForWriting(output_file_);
 std::stringstream stream;
 PrintXmlTestsList(&stream, test_suites);
 fprintf(xmlout, "%s", StringStreamToString(&stream).c_str());
 fclose(xmlout);
}

// Returns an XML-escaped copy of the input string str.  If is_attribute
// is true, the text is meant to appear as an attribute value, and
// normalizable whitespace is preserved by replacing it with character
// references.
//
// Invalid XML characters in str, if any, are stripped from the output.
// It is expected that most, if not all, of the text processed by this
// module will consist of ordinary English text.
// If this module is ever modified to produce version 1.1 XML output,
// most invalid characters can be retained using character references.
std::string XmlUnitTestResultPrinter::EscapeXml(
   const std::string& str, bool is_attribute) {
 Message m;

 for (size_t i = 0; i < str.size(); ++i) {
   const char ch = str[i];
   switch (ch) {
     case '<':
       m << "&lt;";
       break;
     case '>':
       m << "&gt;";
       break;
     case '&':
       m << "&amp;";
       break;
     case '\'':
       if (is_attribute)
         m << "&apos;";
       else
         m << '\'';
       break;
     case '"':
       if (is_attribute)
         m << "&quot;";
       else
         m << '"';
       break;
     default:
       if (IsValidXmlCharacter(ch)) {
         if (is_attribute && IsNormalizableWhitespace(ch))
           m << "&#x" << String::FormatByte(static_cast<unsigned char>(ch))
             << ";";
         else
           m << ch;
       }
       break;
   }
 }

 return m.GetString();
}

// Returns the given string with all characters invalid in XML removed.
// Currently invalid characters are dropped from the string. An
// alternative is to replace them with certain characters such as . or ?.
std::string XmlUnitTestResultPrinter::RemoveInvalidXmlCharacters(
   const std::string& str) {
 std::string output;
 output.reserve(str.size());
 for (std::string::const_iterator it = str.begin(); it != str.end(); ++it)
   if (IsValidXmlCharacter(*it))
     output.push_back(*it);

 return output;
}

// The following routines generate an XML representation of a UnitTest
// object.
// GOOGLETEST_CM0009 DO NOT DELETE
//
// This is how Google Test concepts map to the DTD:
//
// <testsuites name="AllTests">        <-- corresponds to a UnitTest object
//   <testsuite name="testcase-name">  <-- corresponds to a TestSuite object
//     <testcase name="test-name">     <-- corresponds to a TestInfo object
//       <failure message="...">...</failure>
//       <failure message="...">...</failure>
//       <failure message="...">...</failure>
//                                     <-- individual assertion failures
//     </testcase>
//   </testsuite>
// </testsuites>

// Formats the given time in milliseconds as seconds.
std::string FormatTimeInMillisAsSeconds(TimeInMillis ms) {
 ::std::stringstream ss;
 ss << (static_cast<double>(ms) * 1e-3);
 return ss.str();
}

static bool PortableLocaltime(time_t seconds, struct tm* out) {
#if defined(_MSC_VER)
 return localtime_s(out, &seconds) == 0;
#elif defined(__MINGW32__) || defined(__MINGW64__)
 // MINGW <time.h> provides neither localtime_r nor localtime_s, but uses
 // Windows' localtime(), which has a thread-local tm buffer.
 struct tm* tm_ptr = localtime(&seconds);  // NOLINT
 if (tm_ptr == nullptr) return false;
 *out = *tm_ptr;
 return true;
#elif defined(__STDC_LIB_EXT1__)
 // Uses localtime_s when available as localtime_r is only available from
 // C23 standard.
 return localtime_s(&seconds, out) != nullptr;
#else
 return localtime_r(&seconds, out) != nullptr;
#endif
}

// Converts the given epoch time in milliseconds to a date string in the ISO
// 8601 format, without the timezone information.
std::string FormatEpochTimeInMillisAsIso8601(TimeInMillis ms) {
 struct tm time_struct;
 if (!PortableLocaltime(static_cast<time_t>(ms / 1000), &time_struct))
   return "";
 // YYYY-MM-DDThh:mm:ss.sss
 return StreamableToString(time_struct.tm_year + 1900) + "-" +
     String::FormatIntWidth2(time_struct.tm_mon + 1) + "-" +
     String::FormatIntWidth2(time_struct.tm_mday) + "T" +
     String::FormatIntWidth2(time_struct.tm_hour) + ":" +
     String::FormatIntWidth2(time_struct.tm_min) + ":" +
     String::FormatIntWidth2(time_struct.tm_sec) + "." +
     String::FormatIntWidthN(static_cast<int>(ms % 1000), 3);
}

// Streams an XML CDATA section, escaping invalid CDATA sequences as needed.
void XmlUnitTestResultPrinter::OutputXmlCDataSection(::std::ostream* stream,
                                                    const char* data) {
 const char* segment = data;
 *stream << "<![CDATA[";
 for (;;) {
   const char* const next_segment = strstr(segment, "]]>");
   if (next_segment != nullptr) {
     stream->write(
         segment, static_cast<std::streamsize>(next_segment - segment));
     *stream << "]]>]]&gt;<![CDATA[";
     segment = next_segment + strlen("]]>");
   } else {
     *stream << segment;
     break;
   }
 }
 *stream << "]]>";
}

void XmlUnitTestResultPrinter::OutputXmlAttribute(
   std::ostream* stream,
   const std::string& element_name,
   const std::string& name,
   const std::string& value) {
 const std::vector<std::string>& allowed_names =
     GetReservedOutputAttributesForElement(element_name);

 GTEST_CHECK_(std::find(allowed_names.begin(), allowed_names.end(), name) !=
                  allowed_names.end())
     << "Attribute " << name << " is not allowed for element <" << element_name
     << ">.";

 *stream << " " << name << "=\"" << EscapeXmlAttribute(value) << "\"";
}

// Streams a test suite XML stanza containing the given test result.
void XmlUnitTestResultPrinter::OutputXmlTestSuiteForTestResult(
   ::std::ostream* stream, const TestResult& result) {
 // Output the boilerplate for a minimal test suite with one test.
 *stream << "  <testsuite";
 OutputXmlAttribute(stream, "testsuite", "name", "NonTestSuiteFailure");
 OutputXmlAttribute(stream, "testsuite", "tests", "1");
 OutputXmlAttribute(stream, "testsuite", "failures", "1");
 OutputXmlAttribute(stream, "testsuite", "disabled", "0");
 OutputXmlAttribute(stream, "testsuite", "skipped", "0");
 OutputXmlAttribute(stream, "testsuite", "errors", "0");
 OutputXmlAttribute(stream, "testsuite", "time",
                    FormatTimeInMillisAsSeconds(result.elapsed_time()));
 OutputXmlAttribute(
     stream, "testsuite", "timestamp",
     FormatEpochTimeInMillisAsIso8601(result.start_timestamp()));
 *stream << ">";

 // Output the boilerplate for a minimal test case with a single test.
 *stream << "    <testcase";
 OutputXmlAttribute(stream, "testcase", "name", "");
 OutputXmlAttribute(stream, "testcase", "status", "run");
 OutputXmlAttribute(stream, "testcase", "result", "completed");
 OutputXmlAttribute(stream, "testcase", "classname", "");
 OutputXmlAttribute(stream, "testcase", "time",
                    FormatTimeInMillisAsSeconds(result.elapsed_time()));
 OutputXmlAttribute(
     stream, "testcase", "timestamp",
     FormatEpochTimeInMillisAsIso8601(result.start_timestamp()));

 // Output the actual test result.
 OutputXmlTestResult(stream, result);

 // Complete the test suite.
 *stream << "  </testsuite>\n";
}

// Prints an XML representation of a TestInfo object.
void XmlUnitTestResultPrinter::OutputXmlTestInfo(::std::ostream* stream,
                                                const char* test_suite_name,
                                                const TestInfo& test_info) {
 const TestResult& result = *test_info.result();
 const std::string kTestsuite = "testcase";

 if (test_info.is_in_another_shard()) {
   return;
 }

 *stream << "    <testcase";
 OutputXmlAttribute(stream, kTestsuite, "name", test_info.name());

 if (test_info.value_param() != nullptr) {
   OutputXmlAttribute(stream, kTestsuite, "value_param",
                      test_info.value_param());
 }
 if (test_info.type_param() != nullptr) {
   OutputXmlAttribute(stream, kTestsuite, "type_param",
                      test_info.type_param());
 }
 if (GTEST_FLAG(list_tests)) {
   OutputXmlAttribute(stream, kTestsuite, "file", test_info.file());
   OutputXmlAttribute(stream, kTestsuite, "line",
                      StreamableToString(test_info.line()));
   *stream << " />\n";
   return;
 }

 OutputXmlAttribute(stream, kTestsuite, "status",
                    test_info.should_run() ? "run" : "notrun");
 OutputXmlAttribute(stream, kTestsuite, "result",
                    test_info.should_run()
                        ? (result.Skipped() ? "skipped" : "completed")
                        : "suppressed");
 OutputXmlAttribute(stream, kTestsuite, "time",
                    FormatTimeInMillisAsSeconds(result.elapsed_time()));
 OutputXmlAttribute(
     stream, kTestsuite, "timestamp",
     FormatEpochTimeInMillisAsIso8601(result.start_timestamp()));
 OutputXmlAttribute(stream, kTestsuite, "classname", test_suite_name);

 OutputXmlTestResult(stream, result);
}

void XmlUnitTestResultPrinter::OutputXmlTestResult(::std::ostream* stream,
                                                  const TestResult& result) {
 int failures = 0;
 int skips = 0;
 for (int i = 0; i < result.total_part_count(); ++i) {
   const TestPartResult& part = result.GetTestPartResult(i);
   if (part.failed()) {
     if (++failures == 1 && skips == 0) {
       *stream << ">\n";
     }
     const std::string location =
         internal::FormatCompilerIndependentFileLocation(part.file_name(),
                                                         part.line_number());
     const std::string summary = location + "\n" + part.summary();
     *stream << "      <failure message=\""
             << EscapeXmlAttribute(summary)
             << "\" type=\"\">";
     const std::string detail = location + "\n" + part.message();
     OutputXmlCDataSection(stream, RemoveInvalidXmlCharacters(detail).c_str());
     *stream << "</failure>\n";
   } else if (part.skipped()) {
     if (++skips == 1 && failures == 0) {
       *stream << ">\n";
     }
     const std::string location =
         internal::FormatCompilerIndependentFileLocation(part.file_name(),
                                                         part.line_number());
     const std::string summary = location + "\n" + part.summary();
     *stream << "      <skipped message=\""
             << EscapeXmlAttribute(summary.c_str()) << "\">";
     const std::string detail = location + "\n" + part.message();
     OutputXmlCDataSection(stream, RemoveInvalidXmlCharacters(detail).c_str());
     *stream << "</skipped>\n";
   }
 }

 if (failures == 0 && skips == 0 && result.test_property_count() == 0) {
   *stream << " />\n";
 } else {
   if (failures == 0 && skips == 0) {
     *stream << ">\n";
   }
   OutputXmlTestProperties(stream, result);
   *stream << "    </testcase>\n";
 }
}

// Prints an XML representation of a TestSuite object
void XmlUnitTestResultPrinter::PrintXmlTestSuite(std::ostream* stream,
                                                const TestSuite& test_suite) {
 const std::string kTestsuite = "testsuite";
 *stream << "  <" << kTestsuite;
 OutputXmlAttribute(stream, kTestsuite, "name", test_suite.name());
 OutputXmlAttribute(stream, kTestsuite, "tests",
                    StreamableToString(test_suite.reportable_test_count()));
 if (!GTEST_FLAG(list_tests)) {
   OutputXmlAttribute(stream, kTestsuite, "failures",
                      StreamableToString(test_suite.failed_test_count()));
   OutputXmlAttribute(
       stream, kTestsuite, "disabled",
       StreamableToString(test_suite.reportable_disabled_test_count()));
   OutputXmlAttribute(stream, kTestsuite, "skipped",
                      StreamableToString(test_suite.skipped_test_count()));

   OutputXmlAttribute(stream, kTestsuite, "errors", "0");

   OutputXmlAttribute(stream, kTestsuite, "time",
                      FormatTimeInMillisAsSeconds(test_suite.elapsed_time()));
   OutputXmlAttribute(
       stream, kTestsuite, "timestamp",
       FormatEpochTimeInMillisAsIso8601(test_suite.start_timestamp()));
   *stream << TestPropertiesAsXmlAttributes(test_suite.ad_hoc_test_result());
 }
 *stream << ">\n";
 for (int i = 0; i < test_suite.total_test_count(); ++i) {
   if (test_suite.GetTestInfo(i)->is_reportable())
     OutputXmlTestInfo(stream, test_suite.name(), *test_suite.GetTestInfo(i));
 }
 *stream << "  </" << kTestsuite << ">\n";
}

// Prints an XML summary of unit_test to output stream out.
void XmlUnitTestResultPrinter::PrintXmlUnitTest(std::ostream* stream,
                                               const UnitTest& unit_test) {
 const std::string kTestsuites = "testsuites";

 *stream << "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n";
 *stream << "<" << kTestsuites;

 OutputXmlAttribute(stream, kTestsuites, "tests",
                    StreamableToString(unit_test.reportable_test_count()));
 OutputXmlAttribute(stream, kTestsuites, "failures",
                    StreamableToString(unit_test.failed_test_count()));
 OutputXmlAttribute(
     stream, kTestsuites, "disabled",
     StreamableToString(unit_test.reportable_disabled_test_count()));
 OutputXmlAttribute(stream, kTestsuites, "errors", "0");
 OutputXmlAttribute(stream, kTestsuites, "time",
                    FormatTimeInMillisAsSeconds(unit_test.elapsed_time()));
 OutputXmlAttribute(
     stream, kTestsuites, "timestamp",
     FormatEpochTimeInMillisAsIso8601(unit_test.start_timestamp()));

 if (GTEST_FLAG(shuffle)) {
   OutputXmlAttribute(stream, kTestsuites, "random_seed",
                      StreamableToString(unit_test.random_seed()));
 }
 *stream << TestPropertiesAsXmlAttributes(unit_test.ad_hoc_test_result());

 OutputXmlAttribute(stream, kTestsuites, "name", "AllTests");
 *stream << ">\n";

 for (int i = 0; i < unit_test.total_test_suite_count(); ++i) {
   if (unit_test.GetTestSuite(i)->reportable_test_count() > 0)
     PrintXmlTestSuite(stream, *unit_test.GetTestSuite(i));
 }

 // If there was a test failure outside of one of the test suites (like in a
 // test environment) include that in the output.
 if (unit_test.ad_hoc_test_result().Failed()) {
   OutputXmlTestSuiteForTestResult(stream, unit_test.ad_hoc_test_result());
 }

 *stream << "</" << kTestsuites << ">\n";
}

void XmlUnitTestResultPrinter::PrintXmlTestsList(
   std::ostream* stream, const std::vector<TestSuite*>& test_suites) {
 const std::string kTestsuites = "testsuites";

 *stream << "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n";
 *stream << "<" << kTestsuites;

 int total_tests = 0;
 for (auto test_suite : test_suites) {
   total_tests += test_suite->total_test_count();
 }
 OutputXmlAttribute(stream, kTestsuites, "tests",
                    StreamableToString(total_tests));
 OutputXmlAttribute(stream, kTestsuites, "name", "AllTests");
 *stream << ">\n";

 for (auto test_suite : test_suites) {
   PrintXmlTestSuite(stream, *test_suite);
 }
 *stream << "</" << kTestsuites << ">\n";
}

// Produces a string representing the test properties in a result as space
// delimited XML attributes based on the property key="value" pairs.
std::string XmlUnitTestResultPrinter::TestPropertiesAsXmlAttributes(
   const TestResult& result) {
 Message attributes;
 for (int i = 0; i < result.test_property_count(); ++i) {
   const TestProperty& property = result.GetTestProperty(i);
   attributes << " " << property.key() << "="
       << "\"" << EscapeXmlAttribute(property.value()) << "\"";
 }
 return attributes.GetString();
}

void XmlUnitTestResultPrinter::OutputXmlTestProperties(
   std::ostream* stream, const TestResult& result) {
 const std::string kProperties = "properties";
 const std::string kProperty = "property";

 if (result.test_property_count() <= 0) {
   return;
 }

 *stream << "<" << kProperties << ">\n";
 for (int i = 0; i < result.test_property_count(); ++i) {
   const TestProperty& property = result.GetTestProperty(i);
   *stream << "<" << kProperty;
   *stream << " name=\"" << EscapeXmlAttribute(property.key()) << "\"";
   *stream << " value=\"" << EscapeXmlAttribute(property.value()) << "\"";
   *stream << "/>\n";
 }
 *stream << "</" << kProperties << ">\n";
}

// End XmlUnitTestResultPrinter

// This class generates an JSON output file.
class JsonUnitTestResultPrinter : public EmptyTestEventListener {
public:
 explicit JsonUnitTestResultPrinter(const char* output_file);

 void OnTestIterationEnd(const UnitTest& unit_test, int iteration) override;

 // Prints an JSON summary of all unit tests.
 static void PrintJsonTestList(::std::ostream* stream,
                               const std::vector<TestSuite*>& test_suites);

private:
 // Returns an JSON-escaped copy of the input string str.
 static std::string EscapeJson(const std::string& str);

 //// Verifies that the given attribute belongs to the given element and
 //// streams the attribute as JSON.
 static void OutputJsonKey(std::ostream* stream,
                           const std::string& element_name,
                           const std::string& name,
                           const std::string& value,
                           const std::string& indent,
                           bool comma = true);
 static void OutputJsonKey(std::ostream* stream,
                           const std::string& element_name,
                           const std::string& name,
                           int value,
                           const std::string& indent,
                           bool comma = true);

 // Streams a test suite JSON stanza containing the given test result.
 //
 // Requires: result.Failed()
 static void OutputJsonTestSuiteForTestResult(::std::ostream* stream,
                                              const TestResult& result);

 // Streams a JSON representation of a TestResult object.
 static void OutputJsonTestResult(::std::ostream* stream,
                                  const TestResult& result);

 // Streams a JSON representation of a TestInfo object.
 static void OutputJsonTestInfo(::std::ostream* stream,
                                const char* test_suite_name,
                                const TestInfo& test_info);

 // Prints a JSON representation of a TestSuite object
 static void PrintJsonTestSuite(::std::ostream* stream,
                                const TestSuite& test_suite);

 // Prints a JSON summary of unit_test to output stream out.
 static void PrintJsonUnitTest(::std::ostream* stream,
                               const UnitTest& unit_test);

 // Produces a string representing the test properties in a result as
 // a JSON dictionary.
 static std::string TestPropertiesAsJson(const TestResult& result,
                                         const std::string& indent);

 // The output file.
 const std::string output_file_;

 GTEST_DISALLOW_COPY_AND_ASSIGN_(JsonUnitTestResultPrinter);
};

// Creates a new JsonUnitTestResultPrinter.
JsonUnitTestResultPrinter::JsonUnitTestResultPrinter(const char* output_file)
   : output_file_(output_file) {
 if (output_file_.empty()) {
   GTEST_LOG_(FATAL) << "JSON output file may not be null";
 }
}

void JsonUnitTestResultPrinter::OnTestIterationEnd(const UnitTest& unit_test,
                                                 int /*iteration*/) {
 FILE* jsonout = OpenFileForWriting(output_file_);
 std::stringstream stream;
 PrintJsonUnitTest(&stream, unit_test);
 fprintf(jsonout, "%s", StringStreamToString(&stream).c_str());
 fclose(jsonout);
}

// Returns an JSON-escaped copy of the input string str.
std::string JsonUnitTestResultPrinter::EscapeJson(const std::string& str) {
 Message m;

 for (size_t i = 0; i < str.size(); ++i) {
   const char ch = str[i];
   switch (ch) {
     case '\\':
     case '"':
     case '/':
       m << '\\' << ch;
       break;
     case '\b':
       m << "\\b";
       break;
     case '\t':
       m << "\\t";
       break;
     case '\n':
       m << "\\n";
       break;
     case '\f':
       m << "\\f";
       break;
     case '\r':
       m << "\\r";
       break;
     default:
       if (ch < ' ') {
         m << "\\u00" << String::FormatByte(static_cast<unsigned char>(ch));
       } else {
         m << ch;
       }
       break;
   }
 }

 return m.GetString();
}

// The following routines generate an JSON representation of a UnitTest
// object.

// Formats the given time in milliseconds as seconds.
static std::string FormatTimeInMillisAsDuration(TimeInMillis ms) {
 ::std::stringstream ss;
 ss << (static_cast<double>(ms) * 1e-3) << "s";
 return ss.str();
}

// Converts the given epoch time in milliseconds to a date string in the
// RFC3339 format, without the timezone information.
static std::string FormatEpochTimeInMillisAsRFC3339(TimeInMillis ms) {
 struct tm time_struct;
 if (!PortableLocaltime(static_cast<time_t>(ms / 1000), &time_struct))
   return "";
 // YYYY-MM-DDThh:mm:ss
 return StreamableToString(time_struct.tm_year + 1900) + "-" +
     String::FormatIntWidth2(time_struct.tm_mon + 1) + "-" +
     String::FormatIntWidth2(time_struct.tm_mday) + "T" +
     String::FormatIntWidth2(time_struct.tm_hour) + ":" +
     String::FormatIntWidth2(time_struct.tm_min) + ":" +
     String::FormatIntWidth2(time_struct.tm_sec) + "Z";
}

static inline std::string Indent(size_t width) {
 return std::string(width, ' ');
}

void JsonUnitTestResultPrinter::OutputJsonKey(
   std::ostream* stream,
   const std::string& element_name,
   const std::string& name,
   const std::string& value,
   const std::string& indent,
   bool comma) {
 const std::vector<std::string>& allowed_names =
     GetReservedOutputAttributesForElement(element_name);

 GTEST_CHECK_(std::find(allowed_names.begin(), allowed_names.end(), name) !=
                  allowed_names.end())
     << "Key \"" << name << "\" is not allowed for value \"" << element_name
     << "\".";

 *stream << indent << "\"" << name << "\": \"" << EscapeJson(value) << "\"";
 if (comma)
   *stream << ",\n";
}

void JsonUnitTestResultPrinter::OutputJsonKey(
   std::ostream* stream,
   const std::string& element_name,
   const std::string& name,
   int value,
   const std::string& indent,
   bool comma) {
 const std::vector<std::string>& allowed_names =
     GetReservedOutputAttributesForElement(element_name);

 GTEST_CHECK_(std::find(allowed_names.begin(), allowed_names.end(), name) !=
                  allowed_names.end())
     << "Key \"" << name << "\" is not allowed for value \"" << element_name
     << "\".";

 *stream << indent << "\"" << name << "\": " << StreamableToString(value);
 if (comma)
   *stream << ",\n";
}

// Streams a test suite JSON stanza containing the given test result.
void JsonUnitTestResultPrinter::OutputJsonTestSuiteForTestResult(
   ::std::ostream* stream, const TestResult& result) {
 // Output the boilerplate for a new test suite.
 *stream << Indent(4) << "{\n";
 OutputJsonKey(stream, "testsuite", "name", "NonTestSuiteFailure", Indent(6));
 OutputJsonKey(stream, "testsuite", "tests", 1, Indent(6));
 if (!GTEST_FLAG(list_tests)) {
   OutputJsonKey(stream, "testsuite", "failures", 1, Indent(6));
   OutputJsonKey(stream, "testsuite", "disabled", 0, Indent(6));
   OutputJsonKey(stream, "testsuite", "skipped", 0, Indent(6));
   OutputJsonKey(stream, "testsuite", "errors", 0, Indent(6));
   OutputJsonKey(stream, "testsuite", "time",
                 FormatTimeInMillisAsDuration(result.elapsed_time()),
                 Indent(6));
   OutputJsonKey(stream, "testsuite", "timestamp",
                 FormatEpochTimeInMillisAsRFC3339(result.start_timestamp()),
                 Indent(6));
 }
 *stream << Indent(6) << "\"testsuite\": [\n";

 // Output the boilerplate for a new test case.
 *stream << Indent(8) << "{\n";
 OutputJsonKey(stream, "testcase", "name", "", Indent(10));
 OutputJsonKey(stream, "testcase", "status", "RUN", Indent(10));
 OutputJsonKey(stream, "testcase", "result", "COMPLETED", Indent(10));
 OutputJsonKey(stream, "testcase", "timestamp",
               FormatEpochTimeInMillisAsRFC3339(result.start_timestamp()),
               Indent(10));
 OutputJsonKey(stream, "testcase", "time",
               FormatTimeInMillisAsDuration(result.elapsed_time()),
               Indent(10));
 OutputJsonKey(stream, "testcase", "classname", "", Indent(10), false);
 *stream << TestPropertiesAsJson(result, Indent(10));

 // Output the actual test result.
 OutputJsonTestResult(stream, result);

 // Finish the test suite.
 *stream << "\n" << Indent(6) << "]\n" << Indent(4) << "}";
}

// Prints a JSON representation of a TestInfo object.
void JsonUnitTestResultPrinter::OutputJsonTestInfo(::std::ostream* stream,
                                                  const char* test_suite_name,
                                                  const TestInfo& test_info) {
 const TestResult& result = *test_info.result();
 const std::string kTestsuite = "testcase";
 const std::string kIndent = Indent(10);

 *stream << Indent(8) << "{\n";
 OutputJsonKey(stream, kTestsuite, "name", test_info.name(), kIndent);

 if (test_info.value_param() != nullptr) {
   OutputJsonKey(stream, kTestsuite, "value_param", test_info.value_param(),
                 kIndent);
 }
 if (test_info.type_param() != nullptr) {
   OutputJsonKey(stream, kTestsuite, "type_param", test_info.type_param(),
                 kIndent);
 }
 if (GTEST_FLAG(list_tests)) {
   OutputJsonKey(stream, kTestsuite, "file", test_info.file(), kIndent);
   OutputJsonKey(stream, kTestsuite, "line", test_info.line(), kIndent, false);
   *stream << "\n" << Indent(8) << "}";
   return;
 }

 OutputJsonKey(stream, kTestsuite, "status",
               test_info.should_run() ? "RUN" : "NOTRUN", kIndent);
 OutputJsonKey(stream, kTestsuite, "result",
               test_info.should_run()
                   ? (result.Skipped() ? "SKIPPED" : "COMPLETED")
                   : "SUPPRESSED",
               kIndent);
 OutputJsonKey(stream, kTestsuite, "timestamp",
               FormatEpochTimeInMillisAsRFC3339(result.start_timestamp()),
               kIndent);
 OutputJsonKey(stream, kTestsuite, "time",
               FormatTimeInMillisAsDuration(result.elapsed_time()), kIndent);
 OutputJsonKey(stream, kTestsuite, "classname", test_suite_name, kIndent,
               false);
 *stream << TestPropertiesAsJson(result, kIndent);

 OutputJsonTestResult(stream, result);
}

void JsonUnitTestResultPrinter::OutputJsonTestResult(::std::ostream* stream,
                                                    const TestResult& result) {
 const std::string kIndent = Indent(10);

 int failures = 0;
 for (int i = 0; i < result.total_part_count(); ++i) {
   const TestPartResult& part = result.GetTestPartResult(i);
   if (part.failed()) {
     *stream << ",\n";
     if (++failures == 1) {
       *stream << kIndent << "\"" << "failures" << "\": [\n";
     }
     const std::string location =
         internal::FormatCompilerIndependentFileLocation(part.file_name(),
                                                         part.line_number());
     const std::string message = EscapeJson(location + "\n" + part.message());
     *stream << kIndent << "  {\n"
             << kIndent << "    \"failure\": \"" << message << "\",\n"
             << kIndent << "    \"type\": \"\"\n"
             << kIndent << "  }";
   }
 }

 if (failures > 0)
   *stream << "\n" << kIndent << "]";
 *stream << "\n" << Indent(8) << "}";
}

// Prints an JSON representation of a TestSuite object
void JsonUnitTestResultPrinter::PrintJsonTestSuite(
   std::ostream* stream, const TestSuite& test_suite) {
 const std::string kTestsuite = "testsuite";
 const std::string kIndent = Indent(6);

 *stream << Indent(4) << "{\n";
 OutputJsonKey(stream, kTestsuite, "name", test_suite.name(), kIndent);
 OutputJsonKey(stream, kTestsuite, "tests", test_suite.reportable_test_count(),
               kIndent);
 if (!GTEST_FLAG(list_tests)) {
   OutputJsonKey(stream, kTestsuite, "failures",
                 test_suite.failed_test_count(), kIndent);
   OutputJsonKey(stream, kTestsuite, "disabled",
                 test_suite.reportable_disabled_test_count(), kIndent);
   OutputJsonKey(stream, kTestsuite, "errors", 0, kIndent);
   OutputJsonKey(
       stream, kTestsuite, "timestamp",
       FormatEpochTimeInMillisAsRFC3339(test_suite.start_timestamp()),
       kIndent);
   OutputJsonKey(stream, kTestsuite, "time",
                 FormatTimeInMillisAsDuration(test_suite.elapsed_time()),
                 kIndent, false);
   *stream << TestPropertiesAsJson(test_suite.ad_hoc_test_result(), kIndent)
           << ",\n";
 }

 *stream << kIndent << "\"" << kTestsuite << "\": [\n";

 bool comma = false;
 for (int i = 0; i < test_suite.total_test_count(); ++i) {
   if (test_suite.GetTestInfo(i)->is_reportable()) {
     if (comma) {
       *stream << ",\n";
     } else {
       comma = true;
     }
     OutputJsonTestInfo(stream, test_suite.name(), *test_suite.GetTestInfo(i));
   }
 }
 *stream << "\n" << kIndent << "]\n" << Indent(4) << "}";
}

// Prints a JSON summary of unit_test to output stream out.
void JsonUnitTestResultPrinter::PrintJsonUnitTest(std::ostream* stream,
                                                 const UnitTest& unit_test) {
 const std::string kTestsuites = "testsuites";
 const std::string kIndent = Indent(2);
 *stream << "{\n";

 OutputJsonKey(stream, kTestsuites, "tests", unit_test.reportable_test_count(),
               kIndent);
 OutputJsonKey(stream, kTestsuites, "failures", unit_test.failed_test_count(),
               kIndent);
 OutputJsonKey(stream, kTestsuites, "disabled",
               unit_test.reportable_disabled_test_count(), kIndent);
 OutputJsonKey(stream, kTestsuites, "errors", 0, kIndent);
 if (GTEST_FLAG(shuffle)) {
   OutputJsonKey(stream, kTestsuites, "random_seed", unit_test.random_seed(),
                 kIndent);
 }
 OutputJsonKey(stream, kTestsuites, "timestamp",
               FormatEpochTimeInMillisAsRFC3339(unit_test.start_timestamp()),
               kIndent);
 OutputJsonKey(stream, kTestsuites, "time",
               FormatTimeInMillisAsDuration(unit_test.elapsed_time()), kIndent,
               false);

 *stream << TestPropertiesAsJson(unit_test.ad_hoc_test_result(), kIndent)
         << ",\n";

 OutputJsonKey(stream, kTestsuites, "name", "AllTests", kIndent);
 *stream << kIndent << "\"" << kTestsuites << "\": [\n";

 bool comma = false;
 for (int i = 0; i < unit_test.total_test_suite_count(); ++i) {
   if (unit_test.GetTestSuite(i)->reportable_test_count() > 0) {
     if (comma) {
       *stream << ",\n";
     } else {
       comma = true;
     }
     PrintJsonTestSuite(stream, *unit_test.GetTestSuite(i));
   }
 }

 // If there was a test failure outside of one of the test suites (like in a
 // test environment) include that in the output.
 if (unit_test.ad_hoc_test_result().Failed()) {
   OutputJsonTestSuiteForTestResult(stream, unit_test.ad_hoc_test_result());
 }

 *stream << "\n" << kIndent << "]\n" << "}\n";
}

void JsonUnitTestResultPrinter::PrintJsonTestList(
   std::ostream* stream, const std::vector<TestSuite*>& test_suites) {
 const std::string kTestsuites = "testsuites";
 const std::string kIndent = Indent(2);
 *stream << "{\n";
 int total_tests = 0;
 for (auto test_suite : test_suites) {
   total_tests += test_suite->total_test_count();
 }
 OutputJsonKey(stream, kTestsuites, "tests", total_tests, kIndent);

 OutputJsonKey(stream, kTestsuites, "name", "AllTests", kIndent);
 *stream << kIndent << "\"" << kTestsuites << "\": [\n";

 for (size_t i = 0; i < test_suites.size(); ++i) {
   if (i != 0) {
     *stream << ",\n";
   }
   PrintJsonTestSuite(stream, *test_suites[i]);
 }

 *stream << "\n"
         << kIndent << "]\n"
         << "}\n";
}
// Produces a string representing the test properties in a result as
// a JSON dictionary.
std::string JsonUnitTestResultPrinter::TestPropertiesAsJson(
   const TestResult& result, const std::string& indent) {
 Message attributes;
 for (int i = 0; i < result.test_property_count(); ++i) {
   const TestProperty& property = result.GetTestProperty(i);
   attributes << ",\n" << indent << "\"" << property.key() << "\": "
              << "\"" << EscapeJson(property.value()) << "\"";
 }
 return attributes.GetString();
}

// End JsonUnitTestResultPrinter

#if GTEST_CAN_STREAM_RESULTS_

// Checks if str contains '=', '&', '%' or '\n' characters. If yes,
// replaces them by "%xx" where xx is their hexadecimal value. For
// example, replaces "=" with "%3D".  This algorithm is O(strlen(str))
// in both time and space -- important as the input str may contain an
// arbitrarily long test failure message and stack trace.
std::string StreamingListener::UrlEncode(const char* str) {
 std::string result;
 result.reserve(strlen(str) + 1);
 for (char ch = *str; ch != '\0'; ch = *++str) {
   switch (ch) {
     case '%':
     case '=':
     case '&':
     case '\n':
       result.append("%" + String::FormatByte(static_cast<unsigned char>(ch)));
       break;
     default:
       result.push_back(ch);
       break;
   }
 }
 return result;
}

void StreamingListener::SocketWriter::MakeConnection() {
 GTEST_CHECK_(sockfd_ == -1)
     << "MakeConnection() can't be called when there is already a connection.";

 addrinfo hints;
 memset(&hints, 0, sizeof(hints));
 hints.ai_family = AF_UNSPEC;    // To allow both IPv4 and IPv6 addresses.
 hints.ai_socktype = SOCK_STREAM;
 addrinfo* servinfo = nullptr;

 // Use the getaddrinfo() to get a linked list of IP addresses for
 // the given host name.
 const int error_num = getaddrinfo(
     host_name_.c_str(), port_num_.c_str(), &hints, &servinfo);
 if (error_num != 0) {
   GTEST_LOG_(WARNING) << "stream_result_to: getaddrinfo() failed: "
                       << gai_strerror(error_num);
 }

 // Loop through all the results and connect to the first we can.
 for (addrinfo* cur_addr = servinfo; sockfd_ == -1 && cur_addr != nullptr;
      cur_addr = cur_addr->ai_next) {
   sockfd_ = socket(
       cur_addr->ai_family, cur_addr->ai_socktype, cur_addr->ai_protocol);
   if (sockfd_ != -1) {
     // Connect the client socket to the server socket.
     if (connect(sockfd_, cur_addr->ai_addr, cur_addr->ai_addrlen) == -1) {
       close(sockfd_);
       sockfd_ = -1;
     }
   }
 }

 freeaddrinfo(servinfo);  // all done with this structure

 if (sockfd_ == -1) {
   GTEST_LOG_(WARNING) << "stream_result_to: failed to connect to "
                       << host_name_ << ":" << port_num_;
 }
}

// End of class Streaming Listener
#endif  // GTEST_CAN_STREAM_RESULTS__

// class OsStackTraceGetter

const char* const OsStackTraceGetterInterface::kElidedFramesMarker =
   "... " GTEST_NAME_ " internal frames ...";

std::string OsStackTraceGetter::CurrentStackTrace(int max_depth, int skip_count)
   GTEST_LOCK_EXCLUDED_(mutex_) {
#if GTEST_HAS_ABSL
 std::string result;

 if (max_depth <= 0) {
   return result;
 }

 max_depth = std::min(max_depth, kMaxStackTraceDepth);

 std::vector<void*> raw_stack(max_depth);
 // Skips the frames requested by the caller, plus this function.
 const int raw_stack_size =
     absl::GetStackTrace(&raw_stack[0], max_depth, skip_count + 1);

 void* caller_frame = nullptr;
 {
   MutexLock lock(&mutex_);
   caller_frame = caller_frame_;
 }

 for (int i = 0; i < raw_stack_size; ++i) {
   if (raw_stack[i] == caller_frame &&
       !GTEST_FLAG(show_internal_stack_frames)) {
     // Add a marker to the trace and stop adding frames.
     absl::StrAppend(&result, kElidedFramesMarker, "\n");
     break;
   }

   char tmp[1024];
   const char* symbol = "(unknown)";
   if (absl::Symbolize(raw_stack[i], tmp, sizeof(tmp))) {
     symbol = tmp;
   }

   char line[1024];
   snprintf(line, sizeof(line), "  %p: %s\n", raw_stack[i], symbol);
   result += line;
 }

 return result;

#else  // !GTEST_HAS_ABSL
 static_cast<void>(max_depth);
 static_cast<void>(skip_count);
 return "";
#endif  // GTEST_HAS_ABSL
}

void OsStackTraceGetter::UponLeavingGTest() GTEST_LOCK_EXCLUDED_(mutex_) {
#if GTEST_HAS_ABSL
 void* caller_frame = nullptr;
 if (absl::GetStackTrace(&caller_frame, 1, 3) <= 0) {
   caller_frame = nullptr;
 }

 MutexLock lock(&mutex_);
 caller_frame_ = caller_frame;
#endif  // GTEST_HAS_ABSL
}

// A helper class that creates the premature-exit file in its
// constructor and deletes the file in its destructor.
class ScopedPrematureExitFile {
public:
 explicit ScopedPrematureExitFile(const char* premature_exit_filepath)
     : premature_exit_filepath_(premature_exit_filepath ?
                                premature_exit_filepath : "") {
   // If a path to the premature-exit file is specified...
   if (!premature_exit_filepath_.empty()) {
     // create the file with a single "0" character in it.  I/O
     // errors are ignored as there's nothing better we can do and we
     // don't want to fail the test because of this.
     FILE* pfile = posix::FOpen(premature_exit_filepath, "w");
     fwrite("0", 1, 1, pfile);
     fclose(pfile);
   }
 }

 ~ScopedPrematureExitFile() {
#if !defined GTEST_OS_ESP8266
   if (!premature_exit_filepath_.empty()) {
     int retval = remove(premature_exit_filepath_.c_str());
     if (retval) {
       GTEST_LOG_(ERROR) << "Failed to remove premature exit filepath \""
                         << premature_exit_filepath_ << "\" with error "
                         << retval;
     }
   }
#endif
 }

private:
 const std::string premature_exit_filepath_;

 GTEST_DISALLOW_COPY_AND_ASSIGN_(ScopedPrematureExitFile);
};

}  // namespace internal

// class TestEventListeners

TestEventListeners::TestEventListeners()
   : repeater_(new internal::TestEventRepeater()),
     default_result_printer_(nullptr),
     default_xml_generator_(nullptr) {}

TestEventListeners::~TestEventListeners() { delete repeater_; }

// Returns the standard listener responsible for the default console
// output.  Can be removed from the listeners list to shut down default
// console output.  Note that removing this object from the listener list
// with Release transfers its ownership to the user.
void TestEventListeners::Append(TestEventListener* listener) {
 repeater_->Append(listener);
}

// Removes the given event listener from the list and returns it.  It then
// becomes the caller's responsibility to delete the listener. Returns
// NULL if the listener is not found in the list.
TestEventListener* TestEventListeners::Release(TestEventListener* listener) {
 if (listener == default_result_printer_)
   default_result_printer_ = nullptr;
 else if (listener == default_xml_generator_)
   default_xml_generator_ = nullptr;
 return repeater_->Release(listener);
}

// Returns repeater that broadcasts the TestEventListener events to all
// subscribers.
TestEventListener* TestEventListeners::repeater() { return repeater_; }

// Sets the default_result_printer attribute to the provided listener.
// The listener is also added to the listener list and previous
// default_result_printer is removed from it and deleted. The listener can
// also be NULL in which case it will not be added to the list. Does
// nothing if the previous and the current listener objects are the same.
void TestEventListeners::SetDefaultResultPrinter(TestEventListener* listener) {
 if (default_result_printer_ != listener) {
   // It is an error to pass this method a listener that is already in the
   // list.
   delete Release(default_result_printer_);
   default_result_printer_ = listener;
   if (listener != nullptr) Append(listener);
 }
}

// Sets the default_xml_generator attribute to the provided listener.  The
// listener is also added to the listener list and previous
// default_xml_generator is removed from it and deleted. The listener can
// also be NULL in which case it will not be added to the list. Does
// nothing if the previous and the current listener objects are the same.
void TestEventListeners::SetDefaultXmlGenerator(TestEventListener* listener) {
 if (default_xml_generator_ != listener) {
   // It is an error to pass this method a listener that is already in the
   // list.
   delete Release(default_xml_generator_);
   default_xml_generator_ = listener;
   if (listener != nullptr) Append(listener);
 }
}

// Controls whether events will be forwarded by the repeater to the
// listeners in the list.
bool TestEventListeners::EventForwardingEnabled() const {
 return repeater_->forwarding_enabled();
}

void TestEventListeners::SuppressEventForwarding() {
 repeater_->set_forwarding_enabled(false);
}

// class UnitTest

// Gets the singleton UnitTest object.  The first time this method is
// called, a UnitTest object is constructed and returned.  Consecutive
// calls will return the same object.
//
// We don't protect this under mutex_ as a user is not supposed to
// call this before main() starts, from which point on the return
// value will never change.
UnitTest* UnitTest::GetInstance() {
 // CodeGear C++Builder insists on a public destructor for the
 // default implementation.  Use this implementation to keep good OO
 // design with private destructor.

#if defined(__BORLANDC__)
 static UnitTest* const instance = new UnitTest;
 return instance;
#else
 static UnitTest instance;
 return &instance;
#endif  // defined(__BORLANDC__)
}

// Gets the number of successful test suites.
int UnitTest::successful_test_suite_count() const {
 return impl()->successful_test_suite_count();
}

// Gets the number of failed test suites.
int UnitTest::failed_test_suite_count() const {
 return impl()->failed_test_suite_count();
}

// Gets the number of all test suites.
int UnitTest::total_test_suite_count() const {
 return impl()->total_test_suite_count();
}

// Gets the number of all test suites that contain at least one test
// that should run.
int UnitTest::test_suite_to_run_count() const {
 return impl()->test_suite_to_run_count();
}

//  Legacy API is deprecated but still available
#ifndef GTEST_REMOVE_LEGACY_TEST_CASEAPI_
int UnitTest::successful_test_case_count() const {
 return impl()->successful_test_suite_count();
}
int UnitTest::failed_test_case_count() const {
 return impl()->failed_test_suite_count();
}
int UnitTest::total_test_case_count() const {
 return impl()->total_test_suite_count();
}
int UnitTest::test_case_to_run_count() const {
 return impl()->test_suite_to_run_count();
}
#endif  //  GTEST_REMOVE_LEGACY_TEST_CASEAPI_

// Gets the number of successful tests.
int UnitTest::successful_test_count() const {
 return impl()->successful_test_count();
}

// Gets the number of skipped tests.
int UnitTest::skipped_test_count() const {
 return impl()->skipped_test_count();
}

// Gets the number of failed tests.
int UnitTest::failed_test_count() const { return impl()->failed_test_count(); }

// Gets the number of disabled tests that will be reported in the XML report.
int UnitTest::reportable_disabled_test_count() const {
 return impl()->reportable_disabled_test_count();
}

// Gets the number of disabled tests.
int UnitTest::disabled_test_count() const {
 return impl()->disabled_test_count();
}

// Gets the number of tests to be printed in the XML report.
int UnitTest::reportable_test_count() const {
 return impl()->reportable_test_count();
}

// Gets the number of all tests.
int UnitTest::total_test_count() const { return impl()->total_test_count(); }

// Gets the number of tests that should run.
int UnitTest::test_to_run_count() const { return impl()->test_to_run_count(); }

// Gets the time of the test program start, in ms from the start of the
// UNIX epoch.
internal::TimeInMillis UnitTest::start_timestamp() const {
   return impl()->start_timestamp();
}

// Gets the elapsed time, in milliseconds.
internal::TimeInMillis UnitTest::elapsed_time() const {
 return impl()->elapsed_time();
}

// Returns true if and only if the unit test passed (i.e. all test suites
// passed).
bool UnitTest::Passed() const { return impl()->Passed(); }

// Returns true if and only if the unit test failed (i.e. some test suite
// failed or something outside of all tests failed).
bool UnitTest::Failed() const { return impl()->Failed(); }

// Gets the i-th test suite among all the test suites. i can range from 0 to
// total_test_suite_count() - 1. If i is not in that range, returns NULL.
const TestSuite* UnitTest::GetTestSuite(int i) const {
 return impl()->GetTestSuite(i);
}

//  Legacy API is deprecated but still available
#ifndef GTEST_REMOVE_LEGACY_TEST_CASEAPI_
const TestCase* UnitTest::GetTestCase(int i) const {
 return impl()->GetTestCase(i);
}
#endif  //  GTEST_REMOVE_LEGACY_TEST_CASEAPI_

// Returns the TestResult containing information on test failures and
// properties logged outside of individual test suites.
const TestResult& UnitTest::ad_hoc_test_result() const {
 return *impl()->ad_hoc_test_result();
}

// Gets the i-th test suite among all the test suites. i can range from 0 to
// total_test_suite_count() - 1. If i is not in that range, returns NULL.
TestSuite* UnitTest::GetMutableTestSuite(int i) {
 return impl()->GetMutableSuiteCase(i);
}

// Returns the list of event listeners that can be used to track events
// inside Google Test.
TestEventListeners& UnitTest::listeners() {
 return *impl()->listeners();
}

// Registers and returns a global test environment.  When a test
// program is run, all global test environments will be set-up in the
// order they were registered.  After all tests in the program have
// finished, all global test environments will be torn-down in the
// *reverse* order they were registered.
//
// The UnitTest object takes ownership of the given environment.
//
// We don't protect this under mutex_, as we only support calling it
// from the main thread.
Environment* UnitTest::AddEnvironment(Environment* env) {
 if (env == nullptr) {
   return nullptr;
 }

 impl_->environments().push_back(env);
 return env;
}

// Adds a TestPartResult to the current TestResult object.  All Google Test
// assertion macros (e.g. ASSERT_TRUE, EXPECT_EQ, etc) eventually call
// this to report their results.  The user code should use the
// assertion macros instead of calling this directly.
void UnitTest::AddTestPartResult(
   TestPartResult::Type result_type,
   const char* file_name,
   int line_number,
   const std::string& message,
   const std::string& os_stack_trace) GTEST_LOCK_EXCLUDED_(mutex_) {
 Message msg;
 msg << message;

 internal::MutexLock lock(&mutex_);
 if (impl_->gtest_trace_stack().size() > 0) {
   msg << "\n" << GTEST_NAME_ << " trace:";

   for (size_t i = impl_->gtest_trace_stack().size(); i > 0; --i) {
     const internal::TraceInfo& trace = impl_->gtest_trace_stack()[i - 1];
     msg << "\n" << internal::FormatFileLocation(trace.file, trace.line)
         << " " << trace.message;
   }
 }

 if (os_stack_trace.c_str() != nullptr && !os_stack_trace.empty()) {
   msg << internal::kStackTraceMarker << os_stack_trace;
 }

 const TestPartResult result = TestPartResult(
     result_type, file_name, line_number, msg.GetString().c_str());
 impl_->GetTestPartResultReporterForCurrentThread()->
     ReportTestPartResult(result);

 if (result_type != TestPartResult::kSuccess &&
     result_type != TestPartResult::kSkip) {
   // gtest_break_on_failure takes precedence over
   // gtest_throw_on_failure.  This allows a user to set the latter
   // in the code (perhaps in order to use Google Test assertions
   // with another testing framework) and specify the former on the
   // command line for debugging.
   if (GTEST_FLAG(break_on_failure)) {
#if GTEST_OS_WINDOWS && !GTEST_OS_WINDOWS_PHONE && !GTEST_OS_WINDOWS_RT
     // Using DebugBreak on Windows allows gtest to still break into a debugger
     // when a failure happens and both the --gtest_break_on_failure and
     // the --gtest_catch_exceptions flags are specified.
     DebugBreak();
#elif (!defined(__native_client__)) &&            \
   ((defined(__clang__) || defined(__GNUC__)) && \
    (defined(__x86_64__) || defined(__i386__)))
     // with clang/gcc we can achieve the same effect on x86 by invoking int3
     asm("int3");
#else
     // Dereference nullptr through a volatile pointer to prevent the compiler
     // from removing. We use this rather than abort() or __builtin_trap() for
     // portability: some debuggers don't correctly trap abort().
     *static_cast<volatile int*>(nullptr) = 1;
#endif  // GTEST_OS_WINDOWS
   } else if (GTEST_FLAG(throw_on_failure)) {
#if GTEST_HAS_EXCEPTIONS
     throw internal::GoogleTestFailureException(result);
#else
     // We cannot call abort() as it generates a pop-up in debug mode
     // that cannot be suppressed in VC 7.1 or below.
     exit(1);
#endif
   }
 }
}

// Adds a TestProperty to the current TestResult object when invoked from
// inside a test, to current TestSuite's ad_hoc_test_result_ when invoked
// from SetUpTestSuite or TearDownTestSuite, or to the global property set
// when invoked elsewhere.  If the result already contains a property with
// the same key, the value will be updated.
void UnitTest::RecordProperty(const std::string& key,
                             const std::string& value) {
 impl_->RecordProperty(TestProperty(key, value));
}

// Runs all tests in this UnitTest object and prints the result.
// Returns 0 if successful, or 1 otherwise.
//
// We don't protect this under mutex_, as we only support calling it
// from the main thread.
int UnitTest::Run() {
 const bool in_death_test_child_process =
     internal::GTEST_FLAG(internal_run_death_test).length() > 0;

 // Google Test implements this protocol for catching that a test
 // program exits before returning control to Google Test:
 //
 //   1. Upon start, Google Test creates a file whose absolute path
 //      is specified by the environment variable
 //      TEST_PREMATURE_EXIT_FILE.
 //   2. When Google Test has finished its work, it deletes the file.
 //
 // This allows a test runner to set TEST_PREMATURE_EXIT_FILE before
 // running a Google-Test-based test program and check the existence
 // of the file at the end of the test execution to see if it has
 // exited prematurely.

 // If we are in the child process of a death test, don't
 // create/delete the premature exit file, as doing so is unnecessary
 // and will confuse the parent process.  Otherwise, create/delete
 // the file upon entering/leaving this function.  If the program
 // somehow exits before this function has a chance to return, the
 // premature-exit file will be left undeleted, causing a test runner
 // that understands the premature-exit-file protocol to report the
 // test as having failed.
 const internal::ScopedPrematureExitFile premature_exit_file(
     in_death_test_child_process
         ? nullptr
         : internal::posix::GetEnv("TEST_PREMATURE_EXIT_FILE"));

 // Captures the value of GTEST_FLAG(catch_exceptions).  This value will be
 // used for the duration of the program.
 impl()->set_catch_exceptions(GTEST_FLAG(catch_exceptions));

#if GTEST_OS_WINDOWS
 // Either the user wants Google Test to catch exceptions thrown by the
 // tests or this is executing in the context of death test child
 // process. In either case the user does not want to see pop-up dialogs
 // about crashes - they are expected.
 if (impl()->catch_exceptions() || in_death_test_child_process) {
# if !GTEST_OS_WINDOWS_MOBILE && !GTEST_OS_WINDOWS_PHONE && !GTEST_OS_WINDOWS_RT
   // SetErrorMode doesn't exist on CE.
   SetErrorMode(SEM_FAILCRITICALERRORS | SEM_NOALIGNMENTFAULTEXCEPT |
                SEM_NOGPFAULTERRORBOX | SEM_NOOPENFILEERRORBOX);
# endif  // !GTEST_OS_WINDOWS_MOBILE

# if (defined(_MSC_VER) || GTEST_OS_WINDOWS_MINGW) && !GTEST_OS_WINDOWS_MOBILE
   // Death test children can be terminated with _abort().  On Windows,
   // _abort() can show a dialog with a warning message.  This forces the
   // abort message to go to stderr instead.
   _set_error_mode(_OUT_TO_STDERR);
# endif

# if defined(_MSC_VER) && !GTEST_OS_WINDOWS_MOBILE
   // In the debug version, Visual Studio pops up a separate dialog
   // offering a choice to debug the aborted program. We need to suppress
   // this dialog or it will pop up for every EXPECT/ASSERT_DEATH statement
   // executed. Google Test will notify the user of any unexpected
   // failure via stderr.
   if (!GTEST_FLAG(break_on_failure))
     _set_abort_behavior(
         0x0,                                    // Clear the following flags:
         _WRITE_ABORT_MSG | _CALL_REPORTFAULT);  // pop-up window, core dump.

   // In debug mode, the Windows CRT can crash with an assertion over invalid
   // input (e.g. passing an invalid file descriptor).  The default handling
   // for these assertions is to pop up a dialog and wait for user input.
   // Instead ask the CRT to dump such assertions to stderr non-interactively.
   if (!IsDebuggerPresent()) {
     (void)_CrtSetReportMode(_CRT_ASSERT,
                             _CRTDBG_MODE_FILE | _CRTDBG_MODE_DEBUG);
     (void)_CrtSetReportFile(_CRT_ASSERT, _CRTDBG_FILE_STDERR);
   }
# endif
 }
#endif  // GTEST_OS_WINDOWS

 return internal::HandleExceptionsInMethodIfSupported(
     impl(),
     &internal::UnitTestImpl::RunAllTests,
     "auxiliary test code (environments or event listeners)") ? 0 : 1;
}

// Returns the working directory when the first TEST() or TEST_F() was
// executed.
const char* UnitTest::original_working_dir() const {
 return impl_->original_working_dir_.c_str();
}

// Returns the TestSuite object for the test that's currently running,
// or NULL if no test is running.
const TestSuite* UnitTest::current_test_suite() const
   GTEST_LOCK_EXCLUDED_(mutex_) {
 internal::MutexLock lock(&mutex_);
 return impl_->current_test_suite();
}

// Legacy API is still available but deprecated
#ifndef GTEST_REMOVE_LEGACY_TEST_CASEAPI_
const TestCase* UnitTest::current_test_case() const
   GTEST_LOCK_EXCLUDED_(mutex_) {
 internal::MutexLock lock(&mutex_);
 return impl_->current_test_suite();
}
#endif

// Returns the TestInfo object for the test that's currently running,
// or NULL if no test is running.
const TestInfo* UnitTest::current_test_info() const
   GTEST_LOCK_EXCLUDED_(mutex_) {
 internal::MutexLock lock(&mutex_);
 return impl_->current_test_info();
}

// Returns the random seed used at the start of the current test run.
int UnitTest::random_seed() const { return impl_->random_seed(); }

// Returns ParameterizedTestSuiteRegistry object used to keep track of
// value-parameterized tests and instantiate and register them.
internal::ParameterizedTestSuiteRegistry&
UnitTest::parameterized_test_registry() GTEST_LOCK_EXCLUDED_(mutex_) {
 return impl_->parameterized_test_registry();
}

// Creates an empty UnitTest.
UnitTest::UnitTest() {
 impl_ = new internal::UnitTestImpl(this);
}

// Destructor of UnitTest.
UnitTest::~UnitTest() {
 delete impl_;
}

// Pushes a trace defined by SCOPED_TRACE() on to the per-thread
// Google Test trace stack.
void UnitTest::PushGTestTrace(const internal::TraceInfo& trace)
   GTEST_LOCK_EXCLUDED_(mutex_) {
 internal::MutexLock lock(&mutex_);
 impl_->gtest_trace_stack().push_back(trace);
}

// Pops a trace from the per-thread Google Test trace stack.
void UnitTest::PopGTestTrace()
   GTEST_LOCK_EXCLUDED_(mutex_) {
 internal::MutexLock lock(&mutex_);
 impl_->gtest_trace_stack().pop_back();
}

namespace internal {

UnitTestImpl::UnitTestImpl(UnitTest* parent)
   : parent_(parent),
     GTEST_DISABLE_MSC_WARNINGS_PUSH_(4355 /* using this in initializer */)
         default_global_test_part_result_reporter_(this),
     default_per_thread_test_part_result_reporter_(this),
     GTEST_DISABLE_MSC_WARNINGS_POP_() global_test_part_result_repoter_(
         &default_global_test_part_result_reporter_),
     per_thread_test_part_result_reporter_(
         &default_per_thread_test_part_result_reporter_),
     parameterized_test_registry_(),
     parameterized_tests_registered_(false),
     last_death_test_suite_(-1),
     current_test_suite_(nullptr),
     current_test_info_(nullptr),
     ad_hoc_test_result_(),
     os_stack_trace_getter_(nullptr),
     post_flag_parse_init_performed_(false),
     random_seed_(0),  // Will be overridden by the flag before first use.
     random_(0),       // Will be reseeded before first use.
     start_timestamp_(0),
     elapsed_time_(0),
#if GTEST_HAS_DEATH_TEST
     death_test_factory_(new DefaultDeathTestFactory),
#endif
     // Will be overridden by the flag before first use.
     catch_exceptions_(false) {
 listeners()->SetDefaultResultPrinter(new PrettyUnitTestResultPrinter);
}

UnitTestImpl::~UnitTestImpl() {
 // Deletes every TestSuite.
 ForEach(test_suites_, internal::Delete<TestSuite>);

 // Deletes every Environment.
 ForEach(environments_, internal::Delete<Environment>);

 delete os_stack_trace_getter_;
}

// Adds a TestProperty to the current TestResult object when invoked in a
// context of a test, to current test suite's ad_hoc_test_result when invoke
// from SetUpTestSuite/TearDownTestSuite, or to the global property set
// otherwise.  If the result already contains a property with the same key,
// the value will be updated.
void UnitTestImpl::RecordProperty(const TestProperty& test_property) {
 std::string xml_element;
 TestResult* test_result;  // TestResult appropriate for property recording.

 if (current_test_info_ != nullptr) {
   xml_element = "testcase";
   test_result = &(current_test_info_->result_);
 } else if (current_test_suite_ != nullptr) {
   xml_element = "testsuite";
   test_result = &(current_test_suite_->ad_hoc_test_result_);
 } else {
   xml_element = "testsuites";
   test_result = &ad_hoc_test_result_;
 }
 test_result->RecordProperty(xml_element, test_property);
}

#if GTEST_HAS_DEATH_TEST
// Disables event forwarding if the control is currently in a death test
// subprocess. Must not be called before InitGoogleTest.
void UnitTestImpl::SuppressTestEventsIfInSubprocess() {
 if (internal_run_death_test_flag_.get() != nullptr)
   listeners()->SuppressEventForwarding();
}
#endif  // GTEST_HAS_DEATH_TEST

// Initializes event listeners performing XML output as specified by
// UnitTestOptions. Must not be called before InitGoogleTest.
void UnitTestImpl::ConfigureXmlOutput() {
 const std::string& output_format = UnitTestOptions::GetOutputFormat();
 if (output_format == "xml") {
   listeners()->SetDefaultXmlGenerator(new XmlUnitTestResultPrinter(
       UnitTestOptions::GetAbsolutePathToOutputFile().c_str()));
 } else if (output_format == "json") {
   listeners()->SetDefaultXmlGenerator(new JsonUnitTestResultPrinter(
       UnitTestOptions::GetAbsolutePathToOutputFile().c_str()));
 } else if (output_format != "") {
   GTEST_LOG_(WARNING) << "WARNING: unrecognized output format \""
                       << output_format << "\" ignored.";
 }
}

#if GTEST_CAN_STREAM_RESULTS_
// Initializes event listeners for streaming test results in string form.
// Must not be called before InitGoogleTest.
void UnitTestImpl::ConfigureStreamingOutput() {
 const std::string& target = GTEST_FLAG(stream_result_to);
 if (!target.empty()) {
   const size_t pos = target.find(':');
   if (pos != std::string::npos) {
     listeners()->Append(new StreamingListener(target.substr(0, pos),
                                               target.substr(pos+1)));
   } else {
     GTEST_LOG_(WARNING) << "unrecognized streaming target \"" << target
                         << "\" ignored.";
   }
 }
}
#endif  // GTEST_CAN_STREAM_RESULTS_

// Performs initialization dependent upon flag values obtained in
// ParseGoogleTestFlagsOnly.  Is called from InitGoogleTest after the call to
// ParseGoogleTestFlagsOnly.  In case a user neglects to call InitGoogleTest
// this function is also called from RunAllTests.  Since this function can be
// called more than once, it has to be idempotent.
void UnitTestImpl::PostFlagParsingInit() {
 // Ensures that this function does not execute more than once.
 if (!post_flag_parse_init_performed_) {
   post_flag_parse_init_performed_ = true;

#if defined(GTEST_CUSTOM_TEST_EVENT_LISTENER_)
   // Register to send notifications about key process state changes.
   listeners()->Append(new GTEST_CUSTOM_TEST_EVENT_LISTENER_());
#endif  // defined(GTEST_CUSTOM_TEST_EVENT_LISTENER_)

#if GTEST_HAS_DEATH_TEST
   InitDeathTestSubprocessControlInfo();
   SuppressTestEventsIfInSubprocess();
#endif  // GTEST_HAS_DEATH_TEST

   // Registers parameterized tests. This makes parameterized tests
   // available to the UnitTest reflection API without running
   // RUN_ALL_TESTS.
   RegisterParameterizedTests();

   // Configures listeners for XML output. This makes it possible for users
   // to shut down the default XML output before invoking RUN_ALL_TESTS.
   ConfigureXmlOutput();

   if (GTEST_FLAG(brief)) {
     listeners()->SetDefaultResultPrinter(new BriefUnitTestResultPrinter);
   }

#if GTEST_CAN_STREAM_RESULTS_
   // Configures listeners for streaming test results to the specified server.
   ConfigureStreamingOutput();
#endif  // GTEST_CAN_STREAM_RESULTS_

#if GTEST_HAS_ABSL
   if (GTEST_FLAG(install_failure_signal_handler)) {
     absl::FailureSignalHandlerOptions options;
     absl::InstallFailureSignalHandler(options);
   }
#endif  // GTEST_HAS_ABSL
 }
}

// A predicate that checks the name of a TestSuite against a known
// value.
//
// This is used for implementation of the UnitTest class only.  We put
// it in the anonymous namespace to prevent polluting the outer
// namespace.
//
// TestSuiteNameIs is copyable.
class TestSuiteNameIs {
public:
 // Constructor.
 explicit TestSuiteNameIs(const std::string& name) : name_(name) {}

 // Returns true if and only if the name of test_suite matches name_.
 bool operator()(const TestSuite* test_suite) const {
   return test_suite != nullptr &&
          strcmp(test_suite->name(), name_.c_str()) == 0;
 }

private:
 std::string name_;
};

// Finds and returns a TestSuite with the given name.  If one doesn't
// exist, creates one and returns it.  It's the CALLER'S
// RESPONSIBILITY to ensure that this function is only called WHEN THE
// TESTS ARE NOT SHUFFLED.
//
// Arguments:
//
//   test_suite_name: name of the test suite
//   type_param:      the name of the test suite's type parameter, or NULL if
//                    this is not a typed or a type-parameterized test suite.
//   set_up_tc:       pointer to the function that sets up the test suite
//   tear_down_tc:    pointer to the function that tears down the test suite
TestSuite* UnitTestImpl::GetTestSuite(
   const char* test_suite_name, const char* type_param,
   internal::SetUpTestSuiteFunc set_up_tc,
   internal::TearDownTestSuiteFunc tear_down_tc) {
 // Can we find a TestSuite with the given name?
 const auto test_suite =
     std::find_if(test_suites_.rbegin(), test_suites_.rend(),
                  TestSuiteNameIs(test_suite_name));

 if (test_suite != test_suites_.rend()) return *test_suite;

 // No.  Let's create one.
 auto* const new_test_suite =
     new TestSuite(test_suite_name, type_param, set_up_tc, tear_down_tc);

 // Is this a death test suite?
 if (internal::UnitTestOptions::MatchesFilter(test_suite_name,
                                              kDeathTestSuiteFilter)) {
   // Yes.  Inserts the test suite after the last death test suite
   // defined so far.  This only works when the test suites haven't
   // been shuffled.  Otherwise we may end up running a death test
   // after a non-death test.
   ++last_death_test_suite_;
   test_suites_.insert(test_suites_.begin() + last_death_test_suite_,
                       new_test_suite);
 } else {
   // No.  Appends to the end of the list.
   test_suites_.push_back(new_test_suite);
 }

 test_suite_indices_.push_back(static_cast<int>(test_suite_indices_.size()));
 return new_test_suite;
}

// Helpers for setting up / tearing down the given environment.  They
// are for use in the ForEach() function.
static void SetUpEnvironment(Environment* env) { env->SetUp(); }
static void TearDownEnvironment(Environment* env) { env->TearDown(); }

// Runs all tests in this UnitTest object, prints the result, and
// returns true if all tests are successful.  If any exception is
// thrown during a test, the test is considered to be failed, but the
// rest of the tests will still be run.
//
// When parameterized tests are enabled, it expands and registers
// parameterized tests first in RegisterParameterizedTests().
// All other functions called from RunAllTests() may safely assume that
// parameterized tests are ready to be counted and run.
bool UnitTestImpl::RunAllTests() {
 // True if and only if Google Test is initialized before RUN_ALL_TESTS() is
 // called.
 const bool gtest_is_initialized_before_run_all_tests = GTestIsInitialized();

 // Do not run any test if the --help flag was specified.
 if (g_help_flag)
   return true;

 // Repeats the call to the post-flag parsing initialization in case the
 // user didn't call InitGoogleTest.
 PostFlagParsingInit();

 // Even if sharding is not on, test runners may want to use the
 // GTEST_SHARD_STATUS_FILE to query whether the test supports the sharding
 // protocol.
 internal::WriteToShardStatusFileIfNeeded();

 // True if and only if we are in a subprocess for running a thread-safe-style
 // death test.
 bool in_subprocess_for_death_test = false;

#if GTEST_HAS_DEATH_TEST
 in_subprocess_for_death_test =
     (internal_run_death_test_flag_.get() != nullptr);
# if defined(GTEST_EXTRA_DEATH_TEST_CHILD_SETUP_)
 if (in_subprocess_for_death_test) {
   GTEST_EXTRA_DEATH_TEST_CHILD_SETUP_();
 }
# endif  // defined(GTEST_EXTRA_DEATH_TEST_CHILD_SETUP_)
#endif  // GTEST_HAS_DEATH_TEST

 const bool should_shard = ShouldShard(kTestTotalShards, kTestShardIndex,
                                       in_subprocess_for_death_test);

 // Compares the full test names with the filter to decide which
 // tests to run.
 const bool has_tests_to_run = FilterTests(should_shard
                                             ? HONOR_SHARDING_PROTOCOL
                                             : IGNORE_SHARDING_PROTOCOL) > 0;

 // Lists the tests and exits if the --gtest_list_tests flag was specified.
 if (GTEST_FLAG(list_tests)) {
   // This must be called *after* FilterTests() has been called.
   ListTestsMatchingFilter();
   return true;
 }

 random_seed_ = GTEST_FLAG(shuffle) ?
     GetRandomSeedFromFlag(GTEST_FLAG(random_seed)) : 0;

 // True if and only if at least one test has failed.
 bool failed = false;

 TestEventListener* repeater = listeners()->repeater();

 start_timestamp_ = GetTimeInMillis();
 repeater->OnTestProgramStart(*parent_);

 // How many times to repeat the tests?  We don't want to repeat them
 // when we are inside the subprocess of a death test.
 const int repeat = in_subprocess_for_death_test ? 1 : GTEST_FLAG(repeat);
 // Repeats forever if the repeat count is negative.
 const bool gtest_repeat_forever = repeat < 0;
 for (int i = 0; gtest_repeat_forever || i != repeat; i++) {
   // We want to preserve failures generated by ad-hoc test
   // assertions executed before RUN_ALL_TESTS().
   ClearNonAdHocTestResult();

   Timer timer;

   // Shuffles test suites and tests if requested.
   if (has_tests_to_run && GTEST_FLAG(shuffle)) {
     random()->Reseed(static_cast<uint32_t>(random_seed_));
     // This should be done before calling OnTestIterationStart(),
     // such that a test event listener can see the actual test order
     // in the event.
     ShuffleTests();
   }

   // Tells the unit test event listeners that the tests are about to start.
   repeater->OnTestIterationStart(*parent_, i);

   // Runs each test suite if there is at least one test to run.
   if (has_tests_to_run) {
     // Sets up all environments beforehand.
     repeater->OnEnvironmentsSetUpStart(*parent_);
     ForEach(environments_, SetUpEnvironment);
     repeater->OnEnvironmentsSetUpEnd(*parent_);

     // Runs the tests only if there was no fatal failure or skip triggered
     // during global set-up.
     if (Test::IsSkipped()) {
       // Emit diagnostics when global set-up calls skip, as it will not be
       // emitted by default.
       TestResult& test_result =
           *internal::GetUnitTestImpl()->current_test_result();
       for (int j = 0; j < test_result.total_part_count(); ++j) {
         const TestPartResult& test_part_result =
             test_result.GetTestPartResult(j);
         if (test_part_result.type() == TestPartResult::kSkip) {
           const std::string& result = test_part_result.message();
           printf("%s\n", result.c_str());
         }
       }
       fflush(stdout);
     } else if (!Test::HasFatalFailure()) {
       for (int test_index = 0; test_index < total_test_suite_count();
            test_index++) {
         GetMutableSuiteCase(test_index)->Run();
         if (GTEST_FLAG(fail_fast) &&
             GetMutableSuiteCase(test_index)->Failed()) {
           for (int j = test_index + 1; j < total_test_suite_count(); j++) {
             GetMutableSuiteCase(j)->Skip();
           }
           break;
         }
       }
     } else if (Test::HasFatalFailure()) {
       // If there was a fatal failure during the global setup then we know we
       // aren't going to run any tests. Explicitly mark all of the tests as
       // skipped to make this obvious in the output.
       for (int test_index = 0; test_index < total_test_suite_count();
            test_index++) {
         GetMutableSuiteCase(test_index)->Skip();
       }
     }

     // Tears down all environments in reverse order afterwards.
     repeater->OnEnvironmentsTearDownStart(*parent_);
     std::for_each(environments_.rbegin(), environments_.rend(),
                   TearDownEnvironment);
     repeater->OnEnvironmentsTearDownEnd(*parent_);
   }

   elapsed_time_ = timer.Elapsed();

   // Tells the unit test event listener that the tests have just finished.
   repeater->OnTestIterationEnd(*parent_, i);

   // Gets the result and clears it.
   if (!Passed()) {
     failed = true;
   }

   // Restores the original test order after the iteration.  This
   // allows the user to quickly repro a failure that happens in the
   // N-th iteration without repeating the first (N - 1) iterations.
   // This is not enclosed in "if (GTEST_FLAG(shuffle)) { ... }", in
   // case the user somehow changes the value of the flag somewhere
   // (it's always safe to unshuffle the tests).
   UnshuffleTests();

   if (GTEST_FLAG(shuffle)) {
     // Picks a new random seed for each iteration.
     random_seed_ = GetNextRandomSeed(random_seed_);
   }
 }

 repeater->OnTestProgramEnd(*parent_);

 if (!gtest_is_initialized_before_run_all_tests) {
   ColoredPrintf(
       GTestColor::kRed,
       "\nIMPORTANT NOTICE - DO NOT IGNORE:\n"
       "This test program did NOT call " GTEST_INIT_GOOGLE_TEST_NAME_
       "() before calling RUN_ALL_TESTS(). This is INVALID. Soon " GTEST_NAME_
       " will start to enforce the valid usage. "
       "Please fix it ASAP, or IT WILL START TO FAIL.\n");  // NOLINT
#if GTEST_FOR_GOOGLE_
   ColoredPrintf(GTestColor::kRed,
                 "For more details, see http://wiki/Main/ValidGUnitMain.\n");
#endif  // GTEST_FOR_GOOGLE_
 }

 return !failed;
}

// Reads the GTEST_SHARD_STATUS_FILE environment variable, and creates the file
// if the variable is present. If a file already exists at this location, this
// function will write over it. If the variable is present, but the file cannot
// be created, prints an error and exits.
void WriteToShardStatusFileIfNeeded() {
 const char* const test_shard_file = posix::GetEnv(kTestShardStatusFile);
 if (test_shard_file != nullptr) {
   FILE* const file = posix::FOpen(test_shard_file, "w");
   if (file == nullptr) {
     ColoredPrintf(GTestColor::kRed,
                   "Could not write to the test shard status file \"%s\" "
                   "specified by the %s environment variable.\n",
                   test_shard_file, kTestShardStatusFile);
     fflush(stdout);
     exit(EXIT_FAILURE);
   }
   fclose(file);
 }
}

// Checks whether sharding is enabled by examining the relevant
// environment variable values. If the variables are present,
// but inconsistent (i.e., shard_index >= total_shards), prints
// an error and exits. If in_subprocess_for_death_test, sharding is
// disabled because it must only be applied to the original test
// process. Otherwise, we could filter out death tests we intended to execute.
bool ShouldShard(const char* total_shards_env,
                const char* shard_index_env,
                bool in_subprocess_for_death_test) {
 if (in_subprocess_for_death_test) {
   return false;
 }

 const int32_t total_shards = Int32FromEnvOrDie(total_shards_env, -1);
 const int32_t shard_index = Int32FromEnvOrDie(shard_index_env, -1);

 if (total_shards == -1 && shard_index == -1) {
   return false;
 } else if (total_shards == -1 && shard_index != -1) {
   const Message msg = Message()
     << "Invalid environment variables: you have "
     << kTestShardIndex << " = " << shard_index
     << ", but have left " << kTestTotalShards << " unset.\n";
   ColoredPrintf(GTestColor::kRed, "%s", msg.GetString().c_str());
   fflush(stdout);
   exit(EXIT_FAILURE);
 } else if (total_shards != -1 && shard_index == -1) {
   const Message msg = Message()
     << "Invalid environment variables: you have "
     << kTestTotalShards << " = " << total_shards
     << ", but have left " << kTestShardIndex << " unset.\n";
   ColoredPrintf(GTestColor::kRed, "%s", msg.GetString().c_str());
   fflush(stdout);
   exit(EXIT_FAILURE);
 } else if (shard_index < 0 || shard_index >= total_shards) {
   const Message msg = Message()
     << "Invalid environment variables: we require 0 <= "
     << kTestShardIndex << " < " << kTestTotalShards
     << ", but you have " << kTestShardIndex << "=" << shard_index
     << ", " << kTestTotalShards << "=" << total_shards << ".\n";
   ColoredPrintf(GTestColor::kRed, "%s", msg.GetString().c_str());
   fflush(stdout);
   exit(EXIT_FAILURE);
 }

 return total_shards > 1;
}

// Parses the environment variable var as an Int32. If it is unset,
// returns default_val. If it is not an Int32, prints an error
// and aborts.
int32_t Int32FromEnvOrDie(const char* var, int32_t default_val) {
 const char* str_val = posix::GetEnv(var);
 if (str_val == nullptr) {
   return default_val;
 }

 int32_t result;
 if (!ParseInt32(Message() << "The value of environment variable " << var,
                 str_val, &result)) {
   exit(EXIT_FAILURE);
 }
 return result;
}

// Given the total number of shards, the shard index, and the test id,
// returns true if and only if the test should be run on this shard. The test id
// is some arbitrary but unique non-negative integer assigned to each test
// method. Assumes that 0 <= shard_index < total_shards.
bool ShouldRunTestOnShard(int total_shards, int shard_index, int test_id) {
 return (test_id % total_shards) == shard_index;
}

// Compares the name of each test with the user-specified filter to
// decide whether the test should be run, then records the result in
// each TestSuite and TestInfo object.
// If shard_tests == true, further filters tests based on sharding
// variables in the environment - see
// https://github.com/google/googletest/blob/master/googletest/docs/advanced.md
// . Returns the number of tests that should run.
int UnitTestImpl::FilterTests(ReactionToSharding shard_tests) {
 const int32_t total_shards = shard_tests == HONOR_SHARDING_PROTOCOL ?
     Int32FromEnvOrDie(kTestTotalShards, -1) : -1;
 const int32_t shard_index = shard_tests == HONOR_SHARDING_PROTOCOL ?
     Int32FromEnvOrDie(kTestShardIndex, -1) : -1;

 // num_runnable_tests are the number of tests that will
 // run across all shards (i.e., match filter and are not disabled).
 // num_selected_tests are the number of tests to be run on
 // this shard.
 int num_runnable_tests = 0;
 int num_selected_tests = 0;
 for (auto* test_suite : test_suites_) {
   const std::string& test_suite_name = test_suite->name();
   test_suite->set_should_run(false);

   for (size_t j = 0; j < test_suite->test_info_list().size(); j++) {
     TestInfo* const test_info = test_suite->test_info_list()[j];
     const std::string test_name(test_info->name());
     // A test is disabled if test suite name or test name matches
     // kDisableTestFilter.
     const bool is_disabled = internal::UnitTestOptions::MatchesFilter(
                                  test_suite_name, kDisableTestFilter) ||
                              internal::UnitTestOptions::MatchesFilter(
                                  test_name, kDisableTestFilter);
     test_info->is_disabled_ = is_disabled;

     const bool matches_filter = internal::UnitTestOptions::FilterMatchesTest(
         test_suite_name, test_name);
     test_info->matches_filter_ = matches_filter;

     const bool is_runnable =
         (GTEST_FLAG(also_run_disabled_tests) || !is_disabled) &&
         matches_filter;

     const bool is_in_another_shard =
         shard_tests != IGNORE_SHARDING_PROTOCOL &&
         !ShouldRunTestOnShard(total_shards, shard_index, num_runnable_tests);
     test_info->is_in_another_shard_ = is_in_another_shard;
     const bool is_selected = is_runnable && !is_in_another_shard;

     num_runnable_tests += is_runnable;
     num_selected_tests += is_selected;

     test_info->should_run_ = is_selected;
     test_suite->set_should_run(test_suite->should_run() || is_selected);
   }
 }
 return num_selected_tests;
}

// Prints the given C-string on a single line by replacing all '\n'
// characters with string "\\n".  If the output takes more than
// max_length characters, only prints the first max_length characters
// and "...".
static void PrintOnOneLine(const char* str, int max_length) {
 if (str != nullptr) {
   for (int i = 0; *str != '\0'; ++str) {
     if (i >= max_length) {
       printf("...");
       break;
     }
     if (*str == '\n') {
       printf("\\n");
       i += 2;
     } else {
       printf("%c", *str);
       ++i;
     }
   }
 }
}

// Prints the names of the tests matching the user-specified filter flag.
void UnitTestImpl::ListTestsMatchingFilter() {
 // Print at most this many characters for each type/value parameter.
 const int kMaxParamLength = 250;

 for (auto* test_suite : test_suites_) {
   bool printed_test_suite_name = false;

   for (size_t j = 0; j < test_suite->test_info_list().size(); j++) {
     const TestInfo* const test_info = test_suite->test_info_list()[j];
     if (test_info->matches_filter_) {
       if (!printed_test_suite_name) {
         printed_test_suite_name = true;
         printf("%s.", test_suite->name());
         if (test_suite->type_param() != nullptr) {
           printf("  # %s = ", kTypeParamLabel);
           // We print the type parameter on a single line to make
           // the output easy to parse by a program.
           PrintOnOneLine(test_suite->type_param(), kMaxParamLength);
         }
         printf("\n");
       }
       printf("  %s", test_info->name());
       if (test_info->value_param() != nullptr) {
         printf("  # %s = ", kValueParamLabel);
         // We print the value parameter on a single line to make the
         // output easy to parse by a program.
         PrintOnOneLine(test_info->value_param(), kMaxParamLength);
       }
       printf("\n");
     }
   }
 }
 fflush(stdout);
 const std::string& output_format = UnitTestOptions::GetOutputFormat();
 if (output_format == "xml" || output_format == "json") {
   FILE* fileout = OpenFileForWriting(
       UnitTestOptions::GetAbsolutePathToOutputFile().c_str());
   std::stringstream stream;
   if (output_format == "xml") {
     XmlUnitTestResultPrinter(
         UnitTestOptions::GetAbsolutePathToOutputFile().c_str())
         .PrintXmlTestsList(&stream, test_suites_);
   } else if (output_format == "json") {
     JsonUnitTestResultPrinter(
         UnitTestOptions::GetAbsolutePathToOutputFile().c_str())
         .PrintJsonTestList(&stream, test_suites_);
   }
   fprintf(fileout, "%s", StringStreamToString(&stream).c_str());
   fclose(fileout);
 }
}

// Sets the OS stack trace getter.
//
// Does nothing if the input and the current OS stack trace getter are
// the same; otherwise, deletes the old getter and makes the input the
// current getter.
void UnitTestImpl::set_os_stack_trace_getter(
   OsStackTraceGetterInterface* getter) {
 if (os_stack_trace_getter_ != getter) {
   delete os_stack_trace_getter_;
   os_stack_trace_getter_ = getter;
 }
}

// Returns the current OS stack trace getter if it is not NULL;
// otherwise, creates an OsStackTraceGetter, makes it the current
// getter, and returns it.
OsStackTraceGetterInterface* UnitTestImpl::os_stack_trace_getter() {
 if (os_stack_trace_getter_ == nullptr) {
#ifdef GTEST_OS_STACK_TRACE_GETTER_
   os_stack_trace_getter_ = new GTEST_OS_STACK_TRACE_GETTER_;
#else
   os_stack_trace_getter_ = new OsStackTraceGetter;
#endif  // GTEST_OS_STACK_TRACE_GETTER_
 }

 return os_stack_trace_getter_;
}

// Returns the most specific TestResult currently running.
TestResult* UnitTestImpl::current_test_result() {
 if (current_test_info_ != nullptr) {
   return &current_test_info_->result_;
 }
 if (current_test_suite_ != nullptr) {
   return &current_test_suite_->ad_hoc_test_result_;
 }
 return &ad_hoc_test_result_;
}

// Shuffles all test suites, and the tests within each test suite,
// making sure that death tests are still run first.
void UnitTestImpl::ShuffleTests() {
 // Shuffles the death test suites.
 ShuffleRange(random(), 0, last_death_test_suite_ + 1, &test_suite_indices_);

 // Shuffles the non-death test suites.
 ShuffleRange(random(), last_death_test_suite_ + 1,
              static_cast<int>(test_suites_.size()), &test_suite_indices_);

 // Shuffles the tests inside each test suite.
 for (auto& test_suite : test_suites_) {
   test_suite->ShuffleTests(random());
 }
}

// Restores the test suites and tests to their order before the first shuffle.
void UnitTestImpl::UnshuffleTests() {
 for (size_t i = 0; i < test_suites_.size(); i++) {
   // Unshuffles the tests in each test suite.
   test_suites_[i]->UnshuffleTests();
   // Resets the index of each test suite.
   test_suite_indices_[i] = static_cast<int>(i);
 }
}

// Returns the current OS stack trace as an std::string.
//
// The maximum number of stack frames to be included is specified by
// the gtest_stack_trace_depth flag.  The skip_count parameter
// specifies the number of top frames to be skipped, which doesn't
// count against the number of frames to be included.
//
// For example, if Foo() calls Bar(), which in turn calls
// GetCurrentOsStackTraceExceptTop(..., 1), Foo() will be included in
// the trace but Bar() and GetCurrentOsStackTraceExceptTop() won't.
std::string GetCurrentOsStackTraceExceptTop(UnitTest* /*unit_test*/,
                                           int skip_count) {
 // We pass skip_count + 1 to skip this wrapper function in addition
 // to what the user really wants to skip.
 return GetUnitTestImpl()->CurrentOsStackTraceExceptTop(skip_count + 1);
}

// Used by the GTEST_SUPPRESS_UNREACHABLE_CODE_WARNING_BELOW_ macro to
// suppress unreachable code warnings.
namespace {
class ClassUniqueToAlwaysTrue {};
}

bool IsTrue(bool condition) { return condition; }

bool AlwaysTrue() {
#if GTEST_HAS_EXCEPTIONS
 // This condition is always false so AlwaysTrue() never actually throws,
 // but it makes the compiler think that it may throw.
 if (IsTrue(false))
   throw ClassUniqueToAlwaysTrue();
#endif  // GTEST_HAS_EXCEPTIONS
 return true;
}

// If *pstr starts with the given prefix, modifies *pstr to be right
// past the prefix and returns true; otherwise leaves *pstr unchanged
// and returns false.  None of pstr, *pstr, and prefix can be NULL.
bool SkipPrefix(const char* prefix, const char** pstr) {
 const size_t prefix_len = strlen(prefix);
 if (strncmp(*pstr, prefix, prefix_len) == 0) {
   *pstr += prefix_len;
   return true;
 }
 return false;
}

// Parses a string as a command line flag.  The string should have
// the format "--flag=value".  When def_optional is true, the "=value"
// part can be omitted.
//
// Returns the value of the flag, or NULL if the parsing failed.
static const char* ParseFlagValue(const char* str, const char* flag,
                                 bool def_optional) {
 // str and flag must not be NULL.
 if (str == nullptr || flag == nullptr) return nullptr;

 // The flag must start with "--" followed by GTEST_FLAG_PREFIX_.
 const std::string flag_str = std::string("--") + GTEST_FLAG_PREFIX_ + flag;
 const size_t flag_len = flag_str.length();
 if (strncmp(str, flag_str.c_str(), flag_len) != 0) return nullptr;

 // Skips the flag name.
 const char* flag_end = str + flag_len;

 // When def_optional is true, it's OK to not have a "=value" part.
 if (def_optional && (flag_end[0] == '\0')) {
   return flag_end;
 }

 // If def_optional is true and there are more characters after the
 // flag name, or if def_optional is false, there must be a '=' after
 // the flag name.
 if (flag_end[0] != '=') return nullptr;

 // Returns the string after "=".
 return flag_end + 1;
}

// Parses a string for a bool flag, in the form of either
// "--flag=value" or "--flag".
//
// In the former case, the value is taken as true as long as it does
// not start with '0', 'f', or 'F'.
//
// In the latter case, the value is taken as true.
//
// On success, stores the value of the flag in *value, and returns
// true.  On failure, returns false without changing *value.
static bool ParseBoolFlag(const char* str, const char* flag, bool* value) {
 // Gets the value of the flag as a string.
 const char* const value_str = ParseFlagValue(str, flag, true);

 // Aborts if the parsing failed.
 if (value_str == nullptr) return false;

 // Converts the string value to a bool.
 *value = !(*value_str == '0' || *value_str == 'f' || *value_str == 'F');
 return true;
}

// Parses a string for an int32_t flag, in the form of "--flag=value".
//
// On success, stores the value of the flag in *value, and returns
// true.  On failure, returns false without changing *value.
bool ParseInt32Flag(const char* str, const char* flag, int32_t* value) {
 // Gets the value of the flag as a string.
 const char* const value_str = ParseFlagValue(str, flag, false);

 // Aborts if the parsing failed.
 if (value_str == nullptr) return false;

 // Sets *value to the value of the flag.
 return ParseInt32(Message() << "The value of flag --" << flag,
                   value_str, value);
}

// Parses a string for a string flag, in the form of "--flag=value".
//
// On success, stores the value of the flag in *value, and returns
// true.  On failure, returns false without changing *value.
template <typename String>
static bool ParseStringFlag(const char* str, const char* flag, String* value) {
 // Gets the value of the flag as a string.
 const char* const value_str = ParseFlagValue(str, flag, false);

 // Aborts if the parsing failed.
 if (value_str == nullptr) return false;

 // Sets *value to the value of the flag.
 *value = value_str;
 return true;
}

// Determines whether a string has a prefix that Google Test uses for its
// flags, i.e., starts with GTEST_FLAG_PREFIX_ or GTEST_FLAG_PREFIX_DASH_.
// If Google Test detects that a command line flag has its prefix but is not
// recognized, it will print its help message. Flags starting with
// GTEST_INTERNAL_PREFIX_ followed by "internal_" are considered Google Test
// internal flags and do not trigger the help message.
static bool HasGoogleTestFlagPrefix(const char* str) {
 return (SkipPrefix("--", &str) ||
         SkipPrefix("-", &str) ||
         SkipPrefix("/", &str)) &&
        !SkipPrefix(GTEST_FLAG_PREFIX_ "internal_", &str) &&
        (SkipPrefix(GTEST_FLAG_PREFIX_, &str) ||
         SkipPrefix(GTEST_FLAG_PREFIX_DASH_, &str));
}

// Prints a string containing code-encoded text.  The following escape
// sequences can be used in the string to control the text color:
//
//   @@    prints a single '@' character.
//   @R    changes the color to red.
//   @G    changes the color to green.
//   @Y    changes the color to yellow.
//   @D    changes to the default terminal text color.
//
static void PrintColorEncoded(const char* str) {
 GTestColor color = GTestColor::kDefault;  // The current color.

 // Conceptually, we split the string into segments divided by escape
 // sequences.  Then we print one segment at a time.  At the end of
 // each iteration, the str pointer advances to the beginning of the
 // next segment.
 for (;;) {
   const char* p = strchr(str, '@');
   if (p == nullptr) {
     ColoredPrintf(color, "%s", str);
     return;
   }

   ColoredPrintf(color, "%s", std::string(str, p).c_str());

   const char ch = p[1];
   str = p + 2;
   if (ch == '@') {
     ColoredPrintf(color, "@");
   } else if (ch == 'D') {
     color = GTestColor::kDefault;
   } else if (ch == 'R') {
     color = GTestColor::kRed;
   } else if (ch == 'G') {
     color = GTestColor::kGreen;
   } else if (ch == 'Y') {
     color = GTestColor::kYellow;
   } else {
     --str;
   }
 }
}

static const char kColorEncodedHelpMessage[] =
   "This program contains tests written using " GTEST_NAME_
   ". You can use the\n"
   "following command line flags to control its behavior:\n"
   "\n"
   "Test Selection:\n"
   "  @G--" GTEST_FLAG_PREFIX_
   "list_tests@D\n"
   "      List the names of all tests instead of running them. The name of\n"
   "      TEST(Foo, Bar) is \"Foo.Bar\".\n"
   "  @G--" GTEST_FLAG_PREFIX_
   "filter=@YPOSITIVE_PATTERNS"
   "[@G-@YNEGATIVE_PATTERNS]@D\n"
   "      Run only the tests whose name matches one of the positive patterns "
   "but\n"
   "      none of the negative patterns. '?' matches any single character; "
   "'*'\n"
   "      matches any substring; ':' separates two patterns.\n"
   "  @G--" GTEST_FLAG_PREFIX_
   "also_run_disabled_tests@D\n"
   "      Run all disabled tests too.\n"
   "\n"
   "Test Execution:\n"
   "  @G--" GTEST_FLAG_PREFIX_
   "repeat=@Y[COUNT]@D\n"
   "      Run the tests repeatedly; use a negative count to repeat forever.\n"
   "  @G--" GTEST_FLAG_PREFIX_
   "shuffle@D\n"
   "      Randomize tests' orders on every iteration.\n"
   "  @G--" GTEST_FLAG_PREFIX_
   "random_seed=@Y[NUMBER]@D\n"
   "      Random number seed to use for shuffling test orders (between 1 and\n"
   "      99999, or 0 to use a seed based on the current time).\n"
   "\n"
   "Test Output:\n"
   "  @G--" GTEST_FLAG_PREFIX_
   "color=@Y(@Gyes@Y|@Gno@Y|@Gauto@Y)@D\n"
   "      Enable/disable colored output. The default is @Gauto@D.\n"
   "  @G--" GTEST_FLAG_PREFIX_
   "brief=1@D\n"
   "      Only print test failures.\n"
   "  @G--" GTEST_FLAG_PREFIX_
   "print_time=0@D\n"
   "      Don't print the elapsed time of each test.\n"
   "  @G--" GTEST_FLAG_PREFIX_
   "output=@Y(@Gjson@Y|@Gxml@Y)[@G:@YDIRECTORY_PATH@G" GTEST_PATH_SEP_
   "@Y|@G:@YFILE_PATH]@D\n"
   "      Generate a JSON or XML report in the given directory or with the "
   "given\n"
   "      file name. @YFILE_PATH@D defaults to @Gtest_detail.xml@D.\n"
# if GTEST_CAN_STREAM_RESULTS_
   "  @G--" GTEST_FLAG_PREFIX_
   "stream_result_to=@YHOST@G:@YPORT@D\n"
   "      Stream test results to the given server.\n"
# endif  // GTEST_CAN_STREAM_RESULTS_
   "\n"
   "Assertion Behavior:\n"
# if GTEST_HAS_DEATH_TEST && !GTEST_OS_WINDOWS
   "  @G--" GTEST_FLAG_PREFIX_
   "death_test_style=@Y(@Gfast@Y|@Gthreadsafe@Y)@D\n"
   "      Set the default death test style.\n"
# endif  // GTEST_HAS_DEATH_TEST && !GTEST_OS_WINDOWS
   "  @G--" GTEST_FLAG_PREFIX_
   "break_on_failure@D\n"
   "      Turn assertion failures into debugger break-points.\n"
   "  @G--" GTEST_FLAG_PREFIX_
   "throw_on_failure@D\n"
   "      Turn assertion failures into C++ exceptions for use by an external\n"
   "      test framework.\n"
   "  @G--" GTEST_FLAG_PREFIX_
   "catch_exceptions=0@D\n"
   "      Do not report exceptions as test failures. Instead, allow them\n"
   "      to crash the program or throw a pop-up (on Windows).\n"
   "\n"
   "Except for @G--" GTEST_FLAG_PREFIX_
   "list_tests@D, you can alternatively set "
   "the corresponding\n"
   "environment variable of a flag (all letters in upper-case). For example, "
   "to\n"
   "disable colored text output, you can either specify "
   "@G--" GTEST_FLAG_PREFIX_
   "color=no@D or set\n"
   "the @G" GTEST_FLAG_PREFIX_UPPER_
   "COLOR@D environment variable to @Gno@D.\n"
   "\n"
   "For more information, please read the " GTEST_NAME_
   " documentation at\n"
   "@G" GTEST_PROJECT_URL_ "@D. If you find a bug in " GTEST_NAME_
   "\n"
   "(not one in your own code or tests), please report it to\n"
   "@G<" GTEST_DEV_EMAIL_ ">@D.\n";

static bool ParseGoogleTestFlag(const char* const arg) {
 return ParseBoolFlag(arg, kAlsoRunDisabledTestsFlag,
                      &GTEST_FLAG(also_run_disabled_tests)) ||
        ParseBoolFlag(arg, kBreakOnFailureFlag,
                      &GTEST_FLAG(break_on_failure)) ||
        ParseBoolFlag(arg, kCatchExceptionsFlag,
                      &GTEST_FLAG(catch_exceptions)) ||
        ParseStringFlag(arg, kColorFlag, &GTEST_FLAG(color)) ||
        ParseStringFlag(arg, kDeathTestStyleFlag,
                        &GTEST_FLAG(death_test_style)) ||
        ParseBoolFlag(arg, kDeathTestUseFork,
                      &GTEST_FLAG(death_test_use_fork)) ||
        ParseBoolFlag(arg, kFailFast, &GTEST_FLAG(fail_fast)) ||
        ParseStringFlag(arg, kFilterFlag, &GTEST_FLAG(filter)) ||
        ParseStringFlag(arg, kInternalRunDeathTestFlag,
                        &GTEST_FLAG(internal_run_death_test)) ||
        ParseBoolFlag(arg, kListTestsFlag, &GTEST_FLAG(list_tests)) ||
        ParseStringFlag(arg, kOutputFlag, &GTEST_FLAG(output)) ||
        ParseBoolFlag(arg, kBriefFlag, &GTEST_FLAG(brief)) ||
        ParseBoolFlag(arg, kPrintTimeFlag, &GTEST_FLAG(print_time)) ||
        ParseBoolFlag(arg, kPrintUTF8Flag, &GTEST_FLAG(print_utf8)) ||
        ParseInt32Flag(arg, kRandomSeedFlag, &GTEST_FLAG(random_seed)) ||
        ParseInt32Flag(arg, kRepeatFlag, &GTEST_FLAG(repeat)) ||
        ParseBoolFlag(arg, kShuffleFlag, &GTEST_FLAG(shuffle)) ||
        ParseInt32Flag(arg, kStackTraceDepthFlag,
                       &GTEST_FLAG(stack_trace_depth)) ||
        ParseStringFlag(arg, kStreamResultToFlag,
                        &GTEST_FLAG(stream_result_to)) ||
        ParseBoolFlag(arg, kThrowOnFailureFlag, &GTEST_FLAG(throw_on_failure));
}

#if GTEST_USE_OWN_FLAGFILE_FLAG_
static void LoadFlagsFromFile(const std::string& path) {
 FILE* flagfile = posix::FOpen(path.c_str(), "r");
 if (!flagfile) {
   GTEST_LOG_(FATAL) << "Unable to open file \"" << GTEST_FLAG(flagfile)
                     << "\"";
 }
 std::string contents(ReadEntireFile(flagfile));
 posix::FClose(flagfile);
 std::vector<std::string> lines;
 SplitString(contents, '\n', &lines);
 for (size_t i = 0; i < lines.size(); ++i) {
   if (lines[i].empty())
     continue;
   if (!ParseGoogleTestFlag(lines[i].c_str()))
     g_help_flag = true;
 }
}
#endif  // GTEST_USE_OWN_FLAGFILE_FLAG_

// Parses the command line for Google Test flags, without initializing
// other parts of Google Test.  The type parameter CharType can be
// instantiated to either char or wchar_t.
template <typename CharType>
void ParseGoogleTestFlagsOnlyImpl(int* argc, CharType** argv) {
 for (int i = 1; i < *argc; i++) {
   const std::string arg_string = StreamableToString(argv[i]);
   const char* const arg = arg_string.c_str();

   using internal::ParseBoolFlag;
   using internal::ParseInt32Flag;
   using internal::ParseStringFlag;

   bool remove_flag = false;
   if (ParseGoogleTestFlag(arg)) {
     remove_flag = true;
#if GTEST_USE_OWN_FLAGFILE_FLAG_
   } else if (ParseStringFlag(arg, kFlagfileFlag, &GTEST_FLAG(flagfile))) {
     LoadFlagsFromFile(GTEST_FLAG(flagfile));
     remove_flag = true;
#endif  // GTEST_USE_OWN_FLAGFILE_FLAG_
   } else if (arg_string == "--help" || arg_string == "-h" ||
              arg_string == "-?" || arg_string == "/?" ||
              HasGoogleTestFlagPrefix(arg)) {
     // Both help flag and unrecognized Google Test flags (excluding
     // internal ones) trigger help display.
     g_help_flag = true;
   }

   if (remove_flag) {
     // Shift the remainder of the argv list left by one.  Note
     // that argv has (*argc + 1) elements, the last one always being
     // NULL.  The following loop moves the trailing NULL element as
     // well.
     for (int j = i; j != *argc; j++) {
       argv[j] = argv[j + 1];
     }

     // Decrements the argument count.
     (*argc)--;

     // We also need to decrement the iterator as we just removed
     // an element.
     i--;
   }
 }

 if (g_help_flag) {
   // We print the help here instead of in RUN_ALL_TESTS(), as the
   // latter may not be called at all if the user is using Google
   // Test with another testing framework.
   PrintColorEncoded(kColorEncodedHelpMessage);
 }
}

// Parses the command line for Google Test flags, without initializing
// other parts of Google Test.
void ParseGoogleTestFlagsOnly(int* argc, char** argv) {
 ParseGoogleTestFlagsOnlyImpl(argc, argv);

 // Fix the value of *_NSGetArgc() on macOS, but if and only if
 // *_NSGetArgv() == argv
 // Only applicable to char** version of argv
#if GTEST_OS_MAC
#ifndef GTEST_OS_IOS
 if (*_NSGetArgv() == argv) {
   *_NSGetArgc() = *argc;
 }
#endif
#endif
}
void ParseGoogleTestFlagsOnly(int* argc, wchar_t** argv) {
 ParseGoogleTestFlagsOnlyImpl(argc, argv);
}

// The internal implementation of InitGoogleTest().
//
// The type parameter CharType can be instantiated to either char or
// wchar_t.
template <typename CharType>
void InitGoogleTestImpl(int* argc, CharType** argv) {
 // We don't want to run the initialization code twice.
 if (GTestIsInitialized()) return;

 if (*argc <= 0) return;

 g_argvs.clear();
 for (int i = 0; i != *argc; i++) {
   g_argvs.push_back(StreamableToString(argv[i]));
 }

#if GTEST_HAS_ABSL
 absl::InitializeSymbolizer(g_argvs[0].c_str());
#endif  // GTEST_HAS_ABSL

 ParseGoogleTestFlagsOnly(argc, argv);
 GetUnitTestImpl()->PostFlagParsingInit();
}

}  // namespace internal

// Initializes Google Test.  This must be called before calling
// RUN_ALL_TESTS().  In particular, it parses a command line for the
// flags that Google Test recognizes.  Whenever a Google Test flag is
// seen, it is removed from argv, and *argc is decremented.
//
// No value is returned.  Instead, the Google Test flag variables are
// updated.
//
// Calling the function for the second time has no user-visible effect.
void InitGoogleTest(int* argc, char** argv) {
#if defined(GTEST_CUSTOM_INIT_GOOGLE_TEST_FUNCTION_)
 GTEST_CUSTOM_INIT_GOOGLE_TEST_FUNCTION_(argc, argv);
#else  // defined(GTEST_CUSTOM_INIT_GOOGLE_TEST_FUNCTION_)
 internal::InitGoogleTestImpl(argc, argv);
#endif  // defined(GTEST_CUSTOM_INIT_GOOGLE_TEST_FUNCTION_)
}

// This overloaded version can be used in Windows programs compiled in
// UNICODE mode.
void InitGoogleTest(int* argc, wchar_t** argv) {
#if defined(GTEST_CUSTOM_INIT_GOOGLE_TEST_FUNCTION_)
 GTEST_CUSTOM_INIT_GOOGLE_TEST_FUNCTION_(argc, argv);
#else  // defined(GTEST_CUSTOM_INIT_GOOGLE_TEST_FUNCTION_)
 internal::InitGoogleTestImpl(argc, argv);
#endif  // defined(GTEST_CUSTOM_INIT_GOOGLE_TEST_FUNCTION_)
}

// This overloaded version can be used on Arduino/embedded platforms where
// there is no argc/argv.
void InitGoogleTest() {
 // Since Arduino doesn't have a command line, fake out the argc/argv arguments
 int argc = 1;
 const auto arg0 = "dummy";
 char* argv0 = const_cast<char*>(arg0);
 char** argv = &argv0;

#if defined(GTEST_CUSTOM_INIT_GOOGLE_TEST_FUNCTION_)
 GTEST_CUSTOM_INIT_GOOGLE_TEST_FUNCTION_(&argc, argv);
#else  // defined(GTEST_CUSTOM_INIT_GOOGLE_TEST_FUNCTION_)
 internal::InitGoogleTestImpl(&argc, argv);
#endif  // defined(GTEST_CUSTOM_INIT_GOOGLE_TEST_FUNCTION_)
}

std::string TempDir() {
#if defined(GTEST_CUSTOM_TEMPDIR_FUNCTION_)
 return GTEST_CUSTOM_TEMPDIR_FUNCTION_();
#elif GTEST_OS_WINDOWS_MOBILE
 return "\\temp\\";
#elif GTEST_OS_WINDOWS
 const char* temp_dir = internal::posix::GetEnv("TEMP");
 if (temp_dir == nullptr || temp_dir[0] == '\0') {
   return "\\temp\\";
 } else if (temp_dir[strlen(temp_dir) - 1] == '\\') {
   return temp_dir;
 } else {
   return std::string(temp_dir) + "\\";
 }
#elif GTEST_OS_LINUX_ANDROID
 const char* temp_dir = internal::posix::GetEnv("TEST_TMPDIR");
 if (temp_dir == nullptr || temp_dir[0] == '\0') {
   return "/data/local/tmp/";
 } else {
   return temp_dir;
 }
#elif GTEST_OS_LINUX
 const char* temp_dir = internal::posix::GetEnv("TEST_TMPDIR");
 if (temp_dir == nullptr || temp_dir[0] == '\0') {
   return "/tmp/";
 } else {
   return temp_dir;
 }
#else
 return "/tmp/";
#endif  // GTEST_OS_WINDOWS_MOBILE
}

// Class ScopedTrace

// Pushes the given source file location and message onto a per-thread
// trace stack maintained by Google Test.
void ScopedTrace::PushTrace(const char* file, int line, std::string message) {
 internal::TraceInfo trace;
 trace.file = file;
 trace.line = line;
 trace.message.swap(message);

 UnitTest::GetInstance()->PushGTestTrace(trace);
}

// Pops the info pushed by the c'tor.
ScopedTrace::~ScopedTrace()
   GTEST_LOCK_EXCLUDED_(&UnitTest::mutex_) {
 UnitTest::GetInstance()->PopGTestTrace();
}

}  // namespace testing