ceph/src/googletest/googletest/samples/sample7_unittest.cc

   1 // Copyright 2008 Google Inc.
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  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