ceph/src/googletest/googletest/samples/sample6_unittest.cc

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  29 //
  30 // Author: wan@google.com (Zhanyong Wan)
  31
  32 // This sample shows how to test common properties of multiple
  33 // implementations of the same interface (aka interface tests).
  34
  35 // The interface and its implementations are in this header.
  36 #include "prime_tables.h"
  37
  38 #include "gtest/gtest.h"
  39
  40 // First, we define some factory functions for creating instances of
  41 // the implementations.  You may be able to skip this step if all your
  42 // implementations can be constructed the same way.
  43
  44 template <class T>
  45 PrimeTable* CreatePrimeTable();
  46
  47 template <>
  48 PrimeTable* CreatePrimeTable<OnTheFlyPrimeTable>() {
  49   return new OnTheFlyPrimeTable;
  50 }
  51
  52 template <>
  53 PrimeTable* CreatePrimeTable<PreCalculatedPrimeTable>() {
  54   return new PreCalculatedPrimeTable(10000);
  55 }
  56
  57 // Then we define a test fixture class template.
  58 template <class T>
  59 class PrimeTableTest : public testing::Test {
  60  protected:
  61   // The ctor calls the factory function to create a prime table
  62   // implemented by T.
  63   PrimeTableTest() : table_(CreatePrimeTable<T>()) {}
  64
  65   virtual ~PrimeTableTest() { delete table_; }
  66
  67   // Note that we test an implementation via the base interface
  68   // instead of the actual implementation class.  This is important
  69   // for keeping the tests close to the real world scenario, where the
  70   // implementation is invoked via the base interface.  It avoids
  71   // got-yas where the implementation class has a method that shadows
  72   // a method with the same name (but slightly different argument
  73   // types) in the base interface, for example.
  74   PrimeTable* const table_;
  75 };
  76
  77 #if GTEST_HAS_TYPED_TEST
  78
  79 using testing::Types;
  80
  81 // Google Test offers two ways for reusing tests for different types.
  82 // The first is called "typed tests".  You should use it if you
  83 // already know *all* the types you are gonna exercise when you write
  84 // the tests.
  85
  86 // To write a typed test case, first use
  87 //
  88 //   TYPED_TEST_CASE(TestCaseName, TypeList);
  89 //
  90 // to declare it and specify the type parameters.  As with TEST_F,
  91 // TestCaseName must match the test fixture name.
  92
  93 // The list of types we want to test.
  94 typedef Types<OnTheFlyPrimeTable, PreCalculatedPrimeTable> Implementations;
  95
  96 TYPED_TEST_CASE(PrimeTableTest, Implementations);
  97
  98 // Then use TYPED_TEST(TestCaseName, TestName) to define a typed test,
  99 // similar to TEST_F.
 100 TYPED_TEST(PrimeTableTest, ReturnsFalseForNonPrimes) {
 101   // Inside the test body, you can refer to the type parameter by
 102   // TypeParam, and refer to the fixture class by TestFixture.  We
 103   // don't need them in this example.
 104
 105   // Since we are in the template world, C++ requires explicitly
 106   // writing 'this->' when referring to members of the fixture class.
 107   // This is something you have to learn to live with.
 108   EXPECT_FALSE(this->table_->IsPrime(-5));
 109   EXPECT_FALSE(this->table_->IsPrime(0));
 110   EXPECT_FALSE(this->table_->IsPrime(1));
 111   EXPECT_FALSE(this->table_->IsPrime(4));
 112   EXPECT_FALSE(this->table_->IsPrime(6));
 113   EXPECT_FALSE(this->table_->IsPrime(100));
 114 }
 115
 116 TYPED_TEST(PrimeTableTest, ReturnsTrueForPrimes) {
 117   EXPECT_TRUE(this->table_->IsPrime(2));
 118   EXPECT_TRUE(this->table_->IsPrime(3));
 119   EXPECT_TRUE(this->table_->IsPrime(5));
 120   EXPECT_TRUE(this->table_->IsPrime(7));
 121   EXPECT_TRUE(this->table_->IsPrime(11));
 122   EXPECT_TRUE(this->table_->IsPrime(131));
 123 }
 124
 125 TYPED_TEST(PrimeTableTest, CanGetNextPrime) {
 126   EXPECT_EQ(2, this->table_->GetNextPrime(0));
 127   EXPECT_EQ(3, this->table_->GetNextPrime(2));
 128   EXPECT_EQ(5, this->table_->GetNextPrime(3));
 129   EXPECT_EQ(7, this->table_->GetNextPrime(5));
 130   EXPECT_EQ(11, this->table_->GetNextPrime(7));
 131   EXPECT_EQ(131, this->table_->GetNextPrime(128));
 132 }
 133
 134 // That's it!  Google Test will repeat each TYPED_TEST for each type
 135 // in the type list specified in TYPED_TEST_CASE.  Sit back and be
 136 // happy that you don't have to define them multiple times.
 137
 138 #endif  // GTEST_HAS_TYPED_TEST
 139
 140 #if GTEST_HAS_TYPED_TEST_P
 141
 142 using testing::Types;
 143
 144 // Sometimes, however, you don't yet know all the types that you want
 145 // to test when you write the tests.  For example, if you are the
 146 // author of an interface and expect other people to implement it, you
 147 // might want to write a set of tests to make sure each implementation
 148 // conforms to some basic requirements, but you don't know what
 149 // implementations will be written in the future.
 150 //
 151 // How can you write the tests without committing to the type
 152 // parameters?  That's what "type-parameterized tests" can do for you.
 153 // It is a bit more involved than typed tests, but in return you get a
 154 // test pattern that can be reused in many contexts, which is a big
 155 // win.  Here's how you do it:
 156
 157 // First, define a test fixture class template.  Here we just reuse
 158 // the PrimeTableTest fixture defined earlier:
 159
 160 template <class T>
 161 class PrimeTableTest2 : public PrimeTableTest<T> {
 162 };
 163
 164 // Then, declare the test case.  The argument is the name of the test
 165 // fixture, and also the name of the test case (as usual).  The _P
 166 // suffix is for "parameterized" or "pattern".
 167 TYPED_TEST_CASE_P(PrimeTableTest2);
 168
 169 // Next, use TYPED_TEST_P(TestCaseName, TestName) to define a test,
 170 // similar to what you do with TEST_F.
 171 TYPED_TEST_P(PrimeTableTest2, ReturnsFalseForNonPrimes) {
 172   EXPECT_FALSE(this->table_->IsPrime(-5));
 173   EXPECT_FALSE(this->table_->IsPrime(0));
 174   EXPECT_FALSE(this->table_->IsPrime(1));
 175   EXPECT_FALSE(this->table_->IsPrime(4));
 176   EXPECT_FALSE(this->table_->IsPrime(6));
 177   EXPECT_FALSE(this->table_->IsPrime(100));
 178 }
 179
 180 TYPED_TEST_P(PrimeTableTest2, ReturnsTrueForPrimes) {
 181   EXPECT_TRUE(this->table_->IsPrime(2));
 182   EXPECT_TRUE(this->table_->IsPrime(3));
 183   EXPECT_TRUE(this->table_->IsPrime(5));
 184   EXPECT_TRUE(this->table_->IsPrime(7));
 185   EXPECT_TRUE(this->table_->IsPrime(11));
 186   EXPECT_TRUE(this->table_->IsPrime(131));
 187 }
 188
 189 TYPED_TEST_P(PrimeTableTest2, CanGetNextPrime) {
 190   EXPECT_EQ(2, this->table_->GetNextPrime(0));
 191   EXPECT_EQ(3, this->table_->GetNextPrime(2));
 192   EXPECT_EQ(5, this->table_->GetNextPrime(3));
 193   EXPECT_EQ(7, this->table_->GetNextPrime(5));
 194   EXPECT_EQ(11, this->table_->GetNextPrime(7));
 195   EXPECT_EQ(131, this->table_->GetNextPrime(128));
 196 }
 197
 198 // Type-parameterized tests involve one extra step: you have to
 199 // enumerate the tests you defined:
 200 REGISTER_TYPED_TEST_CASE_P(
 201     PrimeTableTest2,  // The first argument is the test case name.
 202     // The rest of the arguments are the test names.
 203     ReturnsFalseForNonPrimes, ReturnsTrueForPrimes, CanGetNextPrime);
 204
 205 // At this point the test pattern is done.  However, you don't have
 206 // any real test yet as you haven't said which types you want to run
 207 // the tests with.
 208
 209 // To turn the abstract test pattern into real tests, you instantiate
 210 // it with a list of types.  Usually the test pattern will be defined
 211 // in a .h file, and anyone can #include and instantiate it.  You can
 212 // even instantiate it more than once in the same program.  To tell
 213 // different instances apart, you give each of them a name, which will
 214 // become part of the test case name and can be used in test filters.
 215
 216 // The list of types we want to test.  Note that it doesn't have to be
 217 // defined at the time we write the TYPED_TEST_P()s.
 218 typedef Types<OnTheFlyPrimeTable, PreCalculatedPrimeTable>
 219     PrimeTableImplementations;
 220 INSTANTIATE_TYPED_TEST_CASE_P(OnTheFlyAndPreCalculated,    // Instance name
 221                               PrimeTableTest2,             // Test case name
 222                               PrimeTableImplementations);  // Type list
 223
 224 #endif  // GTEST_HAS_TYPED_TEST_P