ceph/src/jaegertracing/opentelemetry-cpp/third_party/googletest/googletest/samples/sample8_unittest.cc

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  29
  30
  31 // This sample shows how to test code relying on some global flag variables.
  32 // Combine() helps with generating all possible combinations of such flags,
  33 // and each test is given one combination as a parameter.
  34
  35 // Use class definitions to test from this header.
  36 #include "prime_tables.h"
  37
  38 #include "gtest/gtest.h"
  39 namespace {
  40
  41 // Suppose we want to introduce a new, improved implementation of PrimeTable
  42 // which combines speed of PrecalcPrimeTable and versatility of
  43 // OnTheFlyPrimeTable (see prime_tables.h). Inside it instantiates both
  44 // PrecalcPrimeTable and OnTheFlyPrimeTable and uses the one that is more
  45 // appropriate under the circumstances. But in low memory conditions, it can be
  46 // told to instantiate without PrecalcPrimeTable instance at all and use only
  47 // OnTheFlyPrimeTable.
  48 class HybridPrimeTable : public PrimeTable {
  49  public:
  50   HybridPrimeTable(bool force_on_the_fly, int max_precalculated)
  51       : on_the_fly_impl_(new OnTheFlyPrimeTable),
  52         precalc_impl_(force_on_the_fly
  53                           ? nullptr
  54                           : new PreCalculatedPrimeTable(max_precalculated)),
  55         max_precalculated_(max_precalculated) {}
  56   ~HybridPrimeTable() override {
  57     delete on_the_fly_impl_;
  58     delete precalc_impl_;
  59   }
  60
  61   bool IsPrime(int n) const override {
  62     if (precalc_impl_ != nullptr && n < max_precalculated_)
  63       return precalc_impl_->IsPrime(n);
  64     else
  65       return on_the_fly_impl_->IsPrime(n);
  66   }
  67
  68   int GetNextPrime(int p) const override {
  69     int next_prime = -1;
  70     if (precalc_impl_ != nullptr && p < max_precalculated_)
  71       next_prime = precalc_impl_->GetNextPrime(p);
  72
  73     return next_prime != -1 ? next_prime : on_the_fly_impl_->GetNextPrime(p);
  74   }
  75
  76  private:
  77   OnTheFlyPrimeTable* on_the_fly_impl_;
  78   PreCalculatedPrimeTable* precalc_impl_;
  79   int max_precalculated_;
  80 };
  81
  82 using ::testing::TestWithParam;
  83 using ::testing::Bool;
  84 using ::testing::Values;
  85 using ::testing::Combine;
  86
  87 // To test all code paths for HybridPrimeTable we must test it with numbers
  88 // both within and outside PreCalculatedPrimeTable's capacity and also with
  89 // PreCalculatedPrimeTable disabled. We do this by defining fixture which will
  90 // accept different combinations of parameters for instantiating a
  91 // HybridPrimeTable instance.
  92 class PrimeTableTest : public TestWithParam< ::std::tuple<bool, int> > {
  93  protected:
  94   void SetUp() override {
  95     bool force_on_the_fly;
  96     int max_precalculated;
  97     std::tie(force_on_the_fly, max_precalculated) = GetParam();
  98     table_ = new HybridPrimeTable(force_on_the_fly, max_precalculated);
  99   }
 100   void TearDown() override {
 101     delete table_;
 102     table_ = nullptr;
 103   }
 104   HybridPrimeTable* table_;
 105 };
 106
 107 TEST_P(PrimeTableTest, ReturnsFalseForNonPrimes) {
 108   // Inside the test body, you can refer to the test parameter by GetParam().
 109   // In this case, the test parameter is a PrimeTable interface pointer which
 110   // we can use directly.
 111   // Please note that you can also save it in the fixture's SetUp() method
 112   // or constructor and use saved copy in the tests.
 113
 114   EXPECT_FALSE(table_->IsPrime(-5));
 115   EXPECT_FALSE(table_->IsPrime(0));
 116   EXPECT_FALSE(table_->IsPrime(1));
 117   EXPECT_FALSE(table_->IsPrime(4));
 118   EXPECT_FALSE(table_->IsPrime(6));
 119   EXPECT_FALSE(table_->IsPrime(100));
 120 }
 121
 122 TEST_P(PrimeTableTest, ReturnsTrueForPrimes) {
 123   EXPECT_TRUE(table_->IsPrime(2));
 124   EXPECT_TRUE(table_->IsPrime(3));
 125   EXPECT_TRUE(table_->IsPrime(5));
 126   EXPECT_TRUE(table_->IsPrime(7));
 127   EXPECT_TRUE(table_->IsPrime(11));
 128   EXPECT_TRUE(table_->IsPrime(131));
 129 }
 130
 131 TEST_P(PrimeTableTest, CanGetNextPrime) {
 132   EXPECT_EQ(2, table_->GetNextPrime(0));
 133   EXPECT_EQ(3, table_->GetNextPrime(2));
 134   EXPECT_EQ(5, table_->GetNextPrime(3));
 135   EXPECT_EQ(7, table_->GetNextPrime(5));
 136   EXPECT_EQ(11, table_->GetNextPrime(7));
 137   EXPECT_EQ(131, table_->GetNextPrime(128));
 138 }
 139
 140 // In order to run value-parameterized tests, you need to instantiate them,
 141 // or bind them to a list of values which will be used as test parameters.
 142 // You can instantiate them in a different translation module, or even
 143 // instantiate them several times.
 144 //
 145 // Here, we instantiate our tests with a list of parameters. We must combine
 146 // all variations of the boolean flag suppressing PrecalcPrimeTable and some
 147 // meaningful values for tests. We choose a small value (1), and a value that
 148 // will put some of the tested numbers beyond the capability of the
 149 // PrecalcPrimeTable instance and some inside it (10). Combine will produce all
 150 // possible combinations.
 151 INSTANTIATE_TEST_SUITE_P(MeaningfulTestParameters, PrimeTableTest,
 152                          Combine(Bool(), Values(1, 10)));
 153
 154 }  // namespace