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sample7_unittest.cc (4620B)

      1 // Copyright 2008 Google Inc.
      2 // All Rights Reserved.
      3 //
      4 // Redistribution and use in source and binary forms, with or without
      5 // modification, are permitted provided that the following conditions are
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      7 //
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     10 //     * Redistributions in binary form must reproduce the above
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     16 // this software without specific prior written permission.
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     18 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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     25 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     26 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     27 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     28 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     29 
     30 
     31 // This sample shows how to test common properties of multiple
     32 // implementations of an interface (aka interface tests) using
     33 // value-parameterized tests. Each test in the test case has
     34 // a parameter that is an interface pointer to an implementation
     35 // tested.
     36 
     37 // The interface and its implementations are in this header.
     38 #include "prime_tables.h"
     39 
     40 #include "gtest/gtest.h"
     41 namespace {
     42 
     43 using ::testing::TestWithParam;
     44 using ::testing::Values;
     45 
     46 // As a general rule, to prevent a test from affecting the tests that come
     47 // after it, you should create and destroy the tested objects for each test
     48 // instead of reusing them.  In this sample we will define a simple factory
     49 // function for PrimeTable objects.  We will instantiate objects in test's
     50 // SetUp() method and delete them in TearDown() method.
     51 typedef PrimeTable* CreatePrimeTableFunc();
     52 
     53 PrimeTable* CreateOnTheFlyPrimeTable() {
     54  return new OnTheFlyPrimeTable();
     55 }
     56 
     57 template <size_t max_precalculated>
     58 PrimeTable* CreatePreCalculatedPrimeTable() {
     59  return new PreCalculatedPrimeTable(max_precalculated);
     60 }
     61 
     62 // Inside the test body, fixture constructor, SetUp(), and TearDown() you
     63 // can refer to the test parameter by GetParam().  In this case, the test
     64 // parameter is a factory function which we call in fixture's SetUp() to
     65 // create and store an instance of PrimeTable.
     66 class PrimeTableTestSmpl7 : public TestWithParam<CreatePrimeTableFunc*> {
     67 public:
     68  ~PrimeTableTestSmpl7() override { delete table_; }
     69  void SetUp() override { table_ = (*GetParam())(); }
     70  void TearDown() override {
     71    delete table_;
     72    table_ = nullptr;
     73  }
     74 
     75 protected:
     76  PrimeTable* table_;
     77 };
     78 
     79 TEST_P(PrimeTableTestSmpl7, ReturnsFalseForNonPrimes) {
     80  EXPECT_FALSE(table_->IsPrime(-5));
     81  EXPECT_FALSE(table_->IsPrime(0));
     82  EXPECT_FALSE(table_->IsPrime(1));
     83  EXPECT_FALSE(table_->IsPrime(4));
     84  EXPECT_FALSE(table_->IsPrime(6));
     85  EXPECT_FALSE(table_->IsPrime(100));
     86 }
     87 
     88 TEST_P(PrimeTableTestSmpl7, ReturnsTrueForPrimes) {
     89  EXPECT_TRUE(table_->IsPrime(2));
     90  EXPECT_TRUE(table_->IsPrime(3));
     91  EXPECT_TRUE(table_->IsPrime(5));
     92  EXPECT_TRUE(table_->IsPrime(7));
     93  EXPECT_TRUE(table_->IsPrime(11));
     94  EXPECT_TRUE(table_->IsPrime(131));
     95 }
     96 
     97 TEST_P(PrimeTableTestSmpl7, CanGetNextPrime) {
     98  EXPECT_EQ(2, table_->GetNextPrime(0));
     99  EXPECT_EQ(3, table_->GetNextPrime(2));
    100  EXPECT_EQ(5, table_->GetNextPrime(3));
    101  EXPECT_EQ(7, table_->GetNextPrime(5));
    102  EXPECT_EQ(11, table_->GetNextPrime(7));
    103  EXPECT_EQ(131, table_->GetNextPrime(128));
    104 }
    105 
    106 // In order to run value-parameterized tests, you need to instantiate them,
    107 // or bind them to a list of values which will be used as test parameters.
    108 // You can instantiate them in a different translation module, or even
    109 // instantiate them several times.
    110 //
    111 // Here, we instantiate our tests with a list of two PrimeTable object
    112 // factory functions:
    113 INSTANTIATE_TEST_SUITE_P(OnTheFlyAndPreCalculated, PrimeTableTestSmpl7,
    114                         Values(&CreateOnTheFlyPrimeTable,
    115                                &CreatePreCalculatedPrimeTable<1000>));
    116 
    117 }  // namespace