tor-browser

sample10_unittest.cc (4985B)

---

// Copyright 2009 Google Inc. All Rights Reserved.
//
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// modification, are permitted provided that the following conditions are
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//
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// This sample shows how to use Google Test listener API to implement
// a primitive leak checker.

#include <stdio.h>
#include <stdlib.h>

#include "gtest/gtest.h"
using ::testing::EmptyTestEventListener;
using ::testing::InitGoogleTest;
using ::testing::Test;
using ::testing::TestEventListeners;
using ::testing::TestInfo;
using ::testing::TestPartResult;
using ::testing::UnitTest;

namespace {
// We will track memory used by this class.
class Water {
public:
 // Normal Water declarations go here.

 // operator new and operator delete help us control water allocation.
 void* operator new(size_t allocation_size) {
   allocated_++;
   return malloc(allocation_size);
 }

 void operator delete(void* block, size_t /* allocation_size */) {
   allocated_--;
   free(block);
 }

 static int allocated() { return allocated_; }

private:
 static int allocated_;
};

int Water::allocated_ = 0;

// This event listener monitors how many Water objects are created and
// destroyed by each test, and reports a failure if a test leaks some Water
// objects. It does this by comparing the number of live Water objects at
// the beginning of a test and at the end of a test.
class LeakChecker : public EmptyTestEventListener {
private:
 // Called before a test starts.
 void OnTestStart(const TestInfo& /* test_info */) override {
   initially_allocated_ = Water::allocated();
 }

 // Called after a test ends.
 void OnTestEnd(const TestInfo& /* test_info */) override {
   int difference = Water::allocated() - initially_allocated_;

   // You can generate a failure in any event handler except
   // OnTestPartResult. Just use an appropriate Google Test assertion to do
   // it.
   EXPECT_LE(difference, 0) << "Leaked " << difference << " unit(s) of Water!";
 }

 int initially_allocated_;
};

TEST(ListenersTest, DoesNotLeak) {
 Water* water = new Water;
 delete water;
}

// This should fail when the --check_for_leaks command line flag is
// specified.
TEST(ListenersTest, LeaksWater) {
 Water* water = new Water;
 EXPECT_TRUE(water != nullptr);
}
}  // namespace

int main(int argc, char **argv) {
 InitGoogleTest(&argc, argv);

 bool check_for_leaks = false;
 if (argc > 1 && strcmp(argv[1], "--check_for_leaks") == 0 )
   check_for_leaks = true;
 else
   printf("%s\n", "Run this program with --check_for_leaks to enable "
          "custom leak checking in the tests.");

 // If we are given the --check_for_leaks command line flag, installs the
 // leak checker.
 if (check_for_leaks) {
   TestEventListeners& listeners = UnitTest::GetInstance()->listeners();

   // Adds the leak checker to the end of the test event listener list,
   // after the default text output printer and the default XML report
   // generator.
   //
   // The order is important - it ensures that failures generated in the
   // leak checker's OnTestEnd() method are processed by the text and XML
   // printers *before* their OnTestEnd() methods are called, such that
   // they are attributed to the right test. Remember that a listener
   // receives an OnXyzStart event *after* listeners preceding it in the
   // list received that event, and receives an OnXyzEnd event *before*
   // listeners preceding it.
   //
   // We don't need to worry about deleting the new listener later, as
   // Google Test will do it.
   listeners.Append(new LeakChecker);
 }
 return RUN_ALL_TESTS();
}