googletest/include/gtest/gtest-typed-test.h

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  31 // GOOGLETEST_CM0001 DO NOT DELETE
  32
  33 #ifndef GTEST_INCLUDE_GTEST_GTEST_TYPED_TEST_H_
  34 #define GTEST_INCLUDE_GTEST_GTEST_TYPED_TEST_H_
  35
  36 // This header implements typed tests and type-parameterized tests.
  37
  38 // Typed (aka type-driven) tests repeat the same test for types in a
  39 // list.  You must know which types you want to test with when writing
  40 // typed tests. Here's how you do it:
  41
  42 #if 0
  43
  44 // First, define a fixture class template.  It should be parameterized
  45 // by a type.  Remember to derive it from testing::Test.
  46 template <typename T>
  47 class FooTest : public testing::Test {
  48  public:
  49   ...
  50   typedef std::list<T> List;
  51   static T shared_;
  52   T value_;
  53 };
  54
  55 // Next, associate a list of types with the test suite, which will be
  56 // repeated for each type in the list.  The typedef is necessary for
  57 // the macro to parse correctly.
  58 typedef testing::Types<char, int, unsigned int> MyTypes;
  59 TYPED_TEST_SUITE(FooTest, MyTypes);
  60
  61 // If the type list contains only one type, you can write that type
  62 // directly without Types<...>:
  63 //   TYPED_TEST_SUITE(FooTest, int);
  64
  65 // Then, use TYPED_TEST() instead of TEST_F() to define as many typed
  66 // tests for this test suite as you want.
  67 TYPED_TEST(FooTest, DoesBlah) {
  68   // Inside a test, refer to the special name TypeParam to get the type
  69   // parameter.  Since we are inside a derived class template, C++ requires
  70   // us to visit the members of FooTest via 'this'.
  71   TypeParam n = this->value_;
  72
  73   // To visit static members of the fixture, add the TestFixture::
  74   // prefix.
  75   n += TestFixture::shared_;
  76
  77   // To refer to typedefs in the fixture, add the "typename
  78   // TestFixture::" prefix.
  79   typename TestFixture::List values;
  80   values.push_back(n);
  81   ...
  82 }
  83
  84 TYPED_TEST(FooTest, HasPropertyA) { ... }
  85
  86 // TYPED_TEST_SUITE takes an optional third argument which allows to specify a
  87 // class that generates custom test name suffixes based on the type. This should
  88 // be a class which has a static template function GetName(int index) returning
  89 // a string for each type. The provided integer index equals the index of the
  90 // type in the provided type list. In many cases the index can be ignored.
  91 //
  92 // For example:
  93 //   class MyTypeNames {
  94 //    public:
  95 //     template <typename T>
  96 //     static std::string GetName(int) {
  97 //       if (std::is_same<T, char>()) return "char";
  98 //       if (std::is_same<T, int>()) return "int";
  99 //       if (std::is_same<T, unsigned int>()) return "unsignedInt";
 100 //     }
 101 //   };
 102 //   TYPED_TEST_SUITE(FooTest, MyTypes, MyTypeNames);
 103
 104 #endif  // 0
 105
 106 // Type-parameterized tests are abstract test patterns parameterized
 107 // by a type.  Compared with typed tests, type-parameterized tests
 108 // allow you to define the test pattern without knowing what the type
 109 // parameters are.  The defined pattern can be instantiated with
 110 // different types any number of times, in any number of translation
 111 // units.
 112 //
 113 // If you are designing an interface or concept, you can define a
 114 // suite of type-parameterized tests to verify properties that any
 115 // valid implementation of the interface/concept should have.  Then,
 116 // each implementation can easily instantiate the test suite to verify
 117 // that it conforms to the requirements, without having to write
 118 // similar tests repeatedly.  Here's an example:
 119
 120 #if 0
 121
 122 // First, define a fixture class template.  It should be parameterized
 123 // by a type.  Remember to derive it from testing::Test.
 124 template <typename T>
 125 class FooTest : public testing::Test {
 126   ...
 127 };
 128
 129 // Next, declare that you will define a type-parameterized test suite
 130 // (the _P suffix is for "parameterized" or "pattern", whichever you
 131 // prefer):
 132 TYPED_TEST_SUITE_P(FooTest);
 133
 134 // Then, use TYPED_TEST_P() to define as many type-parameterized tests
 135 // for this type-parameterized test suite as you want.
 136 TYPED_TEST_P(FooTest, DoesBlah) {
 137   // Inside a test, refer to TypeParam to get the type parameter.
 138   TypeParam n = 0;
 139   ...
 140 }
 141
 142 TYPED_TEST_P(FooTest, HasPropertyA) { ... }
 143
 144 // Now the tricky part: you need to register all test patterns before
 145 // you can instantiate them.  The first argument of the macro is the
 146 // test suite name; the rest are the names of the tests in this test
 147 // case.
 148 REGISTER_TYPED_TEST_SUITE_P(FooTest,
 149                             DoesBlah, HasPropertyA);
 150
 151 // Finally, you are free to instantiate the pattern with the types you
 152 // want.  If you put the above code in a header file, you can #include
 153 // it in multiple C++ source files and instantiate it multiple times.
 154 //
 155 // To distinguish different instances of the pattern, the first
 156 // argument to the INSTANTIATE_* macro is a prefix that will be added
 157 // to the actual test suite name.  Remember to pick unique prefixes for
 158 // different instances.
 159 typedef testing::Types<char, int, unsigned int> MyTypes;
 160 INSTANTIATE_TYPED_TEST_SUITE_P(My, FooTest, MyTypes);
 161
 162 // If the type list contains only one type, you can write that type
 163 // directly without Types<...>:
 164 //   INSTANTIATE_TYPED_TEST_SUITE_P(My, FooTest, int);
 165 //
 166 // Similar to the optional argument of TYPED_TEST_SUITE above,
 167 // INSTANTIATE_TEST_SUITE_P takes an optional fourth argument which allows to
 168 // generate custom names.
 169 //   INSTANTIATE_TYPED_TEST_SUITE_P(My, FooTest, MyTypes, MyTypeNames);
 170
 171 #endif  // 0
 172
 173 #include "gtest/internal/gtest-port.h"
 174 #include "gtest/internal/gtest-type-util.h"
 175
 176 // Implements typed tests.
 177
 178 #if GTEST_HAS_TYPED_TEST
 179
 180 // INTERNAL IMPLEMENTATION - DO NOT USE IN USER CODE.
 181 //
 182 // Expands to the name of the typedef for the type parameters of the
 183 // given test suite.
 184 #define GTEST_TYPE_PARAMS_(TestSuiteName) gtest_type_params_##TestSuiteName##_
 185
 186 // Expands to the name of the typedef for the NameGenerator, responsible for
 187 // creating the suffixes of the name.
 188 #define GTEST_NAME_GENERATOR_(TestSuiteName) \
 189   gtest_type_params_##TestSuiteName##_NameGenerator
 190
 191 #define TYPED_TEST_SUITE(CaseName, Types, ...)                           \
 192   typedef ::testing::internal::TypeList<Types>::type GTEST_TYPE_PARAMS_( \
 193       CaseName);                                                         \
 194   typedef ::testing::internal::NameGeneratorSelector<__VA_ARGS__>::type  \
 195       GTEST_NAME_GENERATOR_(CaseName)
 196
 197 # define TYPED_TEST(CaseName, TestName)                                       \
 198   template <typename gtest_TypeParam_>                                        \
 199   class GTEST_TEST_CLASS_NAME_(CaseName, TestName)                            \
 200       : public CaseName<gtest_TypeParam_> {                                   \
 201    private:                                                                   \
 202     typedef CaseName<gtest_TypeParam_> TestFixture;                           \
 203     typedef gtest_TypeParam_ TypeParam;                                       \
 204     virtual void TestBody();                                                  \
 205   };                                                                          \
 206   static bool gtest_##CaseName##_##TestName##_registered_                     \
 207         GTEST_ATTRIBUTE_UNUSED_ =                                             \
 208       ::testing::internal::TypeParameterizedTest<                             \
 209           CaseName,                                                           \
 210           ::testing::internal::TemplateSel<GTEST_TEST_CLASS_NAME_(CaseName,   \
 211                                                                   TestName)>, \
 212           GTEST_TYPE_PARAMS_(                                                 \
 213               CaseName)>::Register("",                                        \
 214                                    ::testing::internal::CodeLocation(         \
 215                                        __FILE__, __LINE__),                   \
 216                                    #CaseName, #TestName, 0,                   \
 217                                    ::testing::internal::GenerateNames<        \
 218                                        GTEST_NAME_GENERATOR_(CaseName),       \
 219                                        GTEST_TYPE_PARAMS_(CaseName)>());      \
 220   template <typename gtest_TypeParam_>                                        \
 221   void GTEST_TEST_CLASS_NAME_(CaseName,                                       \
 222                               TestName)<gtest_TypeParam_>::TestBody()
 223
 224 // Legacy API is deprecated but still available
 225 #ifndef GTEST_REMOVE_LEGACY_TEST_CASEAPI_
 226 #define TYPED_TEST_CASE                                                \
 227   static_assert(::testing::internal::TypedTestCaseIsDeprecated(), ""); \
 228   TYPED_TEST_SUITE
 229 #endif  // GTEST_REMOVE_LEGACY_TEST_CASEAPI_
 230
 231 #endif  // GTEST_HAS_TYPED_TEST
 232
 233 // Implements type-parameterized tests.
 234
 235 #if GTEST_HAS_TYPED_TEST_P
 236
 237 // INTERNAL IMPLEMENTATION - DO NOT USE IN USER CODE.
 238 //
 239 // Expands to the namespace name that the type-parameterized tests for
 240 // the given type-parameterized test suite are defined in.  The exact
 241 // name of the namespace is subject to change without notice.
 242 #define GTEST_SUITE_NAMESPACE_(TestSuiteName) gtest_suite_##TestSuiteName##_
 243
 244 // INTERNAL IMPLEMENTATION - DO NOT USE IN USER CODE.
 245 //
 246 // Expands to the name of the variable used to remember the names of
 247 // the defined tests in the given test suite.
 248 #define GTEST_TYPED_TEST_SUITE_P_STATE_(TestSuiteName) \
 249   gtest_typed_test_suite_p_state_##TestSuiteName##_
 250
 251 // INTERNAL IMPLEMENTATION - DO NOT USE IN USER CODE DIRECTLY.
 252 //
 253 // Expands to the name of the variable used to remember the names of
 254 // the registered tests in the given test suite.
 255 #define GTEST_REGISTERED_TEST_NAMES_(TestSuiteName) \
 256   gtest_registered_test_names_##TestSuiteName##_
 257
 258 // The variables defined in the type-parameterized test macros are
 259 // static as typically these macros are used in a .h file that can be
 260 // #included in multiple translation units linked together.
 261 #define TYPED_TEST_SUITE_P(SuiteName)              \
 262   static ::testing::internal::TypedTestSuitePState \
 263       GTEST_TYPED_TEST_SUITE_P_STATE_(SuiteName)
 264
 265 // Legacy API is deprecated but still available
 266 #ifndef GTEST_REMOVE_LEGACY_TEST_CASEAPI_
 267 #define TYPED_TEST_CASE_P                                                 \
 268   static_assert(::testing::internal::TypedTestCase_P_IsDeprecated(), ""); \
 269   TYPED_TEST_SUITE_P
 270 #endif  // GTEST_REMOVE_LEGACY_TEST_CASEAPI_
 271
 272 #define TYPED_TEST_P(SuiteName, TestName)                             \
 273   namespace GTEST_SUITE_NAMESPACE_(SuiteName) {                       \
 274     template <typename gtest_TypeParam_>                              \
 275     class TestName : public SuiteName<gtest_TypeParam_> {             \
 276      private:                                                         \
 277       typedef SuiteName<gtest_TypeParam_> TestFixture;                \
 278       typedef gtest_TypeParam_ TypeParam;                             \
 279       virtual void TestBody();                                        \
 280     };                                                                \
 281     static bool gtest_##TestName##_defined_ GTEST_ATTRIBUTE_UNUSED_ = \
 282         GTEST_TYPED_TEST_SUITE_P_STATE_(SuiteName).AddTestName(       \
 283             __FILE__, __LINE__, #SuiteName, #TestName);               \
 284   }                                                                   \
 285   template <typename gtest_TypeParam_>                                \
 286   void GTEST_SUITE_NAMESPACE_(                                        \
 287       SuiteName)::TestName<gtest_TypeParam_>::TestBody()
 288
 289 #define REGISTER_TYPED_TEST_SUITE_P(SuiteName, ...)                            \
 290   namespace GTEST_SUITE_NAMESPACE_(SuiteName) {                                \
 291     typedef ::testing::internal::Templates<__VA_ARGS__>::type gtest_AllTests_; \
 292   }                                                                            \
 293   static const char* const GTEST_REGISTERED_TEST_NAMES_(                       \
 294       SuiteName) GTEST_ATTRIBUTE_UNUSED_ =                                     \
 295       GTEST_TYPED_TEST_SUITE_P_STATE_(SuiteName).VerifyRegisteredTestNames(    \
 296           __FILE__, __LINE__, #__VA_ARGS__)
 297
 298 // Legacy API is deprecated but still available
 299 #ifndef GTEST_REMOVE_LEGACY_TEST_CASEAPI_
 300 #define REGISTER_TYPED_TEST_CASE_P                                           \
 301   static_assert(::testing::internal::RegisterTypedTestCase_P_IsDeprecated(), \
 302                 "");                                                         \
 303   REGISTER_TYPED_TEST_SUITE_P
 304 #endif  // GTEST_REMOVE_LEGACY_TEST_CASEAPI_
 305
 306 #define INSTANTIATE_TYPED_TEST_SUITE_P(Prefix, SuiteName, Types, ...)       \
 307   static bool gtest_##Prefix##_##SuiteName GTEST_ATTRIBUTE_UNUSED_ =        \
 308       ::testing::internal::TypeParameterizedTestSuite<                      \
 309           SuiteName, GTEST_SUITE_NAMESPACE_(SuiteName)::gtest_AllTests_,    \
 310           ::testing::internal::TypeList<Types>::type>::                     \
 311           Register(#Prefix,                                                 \
 312                    ::testing::internal::CodeLocation(__FILE__, __LINE__),   \
 313                    &GTEST_TYPED_TEST_SUITE_P_STATE_(SuiteName), #SuiteName, \
 314                    GTEST_REGISTERED_TEST_NAMES_(SuiteName),                 \
 315                    ::testing::internal::GenerateNames<                      \
 316                        ::testing::internal::NameGeneratorSelector<          \
 317                            __VA_ARGS__>::type,                              \
 318                        ::testing::internal::TypeList<Types>::type>())
 319
 320 // Legacy API is deprecated but still available
 321 #ifndef GTEST_REMOVE_LEGACY_TEST_CASEAPI_
 322 #define INSTANTIATE_TYPED_TEST_CASE_P                                      \
 323   static_assert(                                                           \
 324       ::testing::internal::InstantiateTypedTestCase_P_IsDeprecated(), ""); \
 325   INSTANTIATE_TYPED_TEST_SUITE_P
 326 #endif  // GTEST_REMOVE_LEGACY_TEST_CASEAPI_
 327
 328 #endif  // GTEST_HAS_TYPED_TEST_P
 329
 330 #endif  // GTEST_INCLUDE_GTEST_GTEST_TYPED_TEST_H_