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 6 // met: 7 // 8 // * Redistributions of source code must retain the above copyright 9 // notice, this list of conditions and the following disclaimer. 10 // * Redistributions in binary form must reproduce the above 11 // copyright notice, this list of conditions and the following disclaimer 12 // in the documentation and/or other materials provided with the 13 // distribution. 14 // * Neither the name of Google Inc. nor the names of its 15 // contributors may be used to endorse or promote products derived from 16 // this software without specific prior written permission. 17 // 18 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 19 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 20 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 21 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 22 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 23 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 24 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 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 // Author: vladl (at) google.com (Vlad Losev) 31 32 // This sample shows how to test common properties of multiple 33 // implementations of an interface (aka interface tests) using 34 // value-parameterized tests. Each test in the test case has 35 // a parameter that is an interface pointer to an implementation 36 // tested. 37 38 // The interface and its implementations are in this header. 39 #include "prime_tables.h" 40 41 #include <gtest/gtest.h> 42 43 #if GTEST_HAS_PARAM_TEST 44 45 using ::testing::TestWithParam; 46 using ::testing::Values; 47 48 // As a general rule, tested objects should not be reused between tests. 49 // Also, their constructors and destructors of tested objects can have 50 // side effects. Thus you should create and destroy them for each test. 51 // In this sample we will define a simple factory function for PrimeTable 52 // objects. We will instantiate objects in test's SetUp() method and 53 // delete them in TearDown() method. 54 typedef PrimeTable* CreatePrimeTableFunc(); 55 56 PrimeTable* CreateOnTheFlyPrimeTable() { 57 return new OnTheFlyPrimeTable(); 58 } 59 60 template <size_t max_precalculated> 61 PrimeTable* CreatePreCalculatedPrimeTable() { 62 return new PreCalculatedPrimeTable(max_precalculated); 63 } 64 65 // Inside the test body, fixture constructor, SetUp(), and TearDown() 66 // you can refer to the test parameter by GetParam(). 67 // In this case, the test parameter is a PrimeTableFactory interface pointer 68 // which we use in fixture's SetUp() to create and store an instance of 69 // PrimeTable. 70 class PrimeTableTest : public TestWithParam<CreatePrimeTableFunc*> { 71 public: 72 virtual ~PrimeTableTest() { delete table_; } 73 virtual void SetUp() { table_ = (*GetParam())(); } 74 virtual void TearDown() { 75 delete table_; 76 table_ = NULL; 77 } 78 79 protected: 80 PrimeTable* table_; 81 }; 82 83 TEST_P(PrimeTableTest, ReturnsFalseForNonPrimes) { 84 EXPECT_FALSE(table_->IsPrime(-5)); 85 EXPECT_FALSE(table_->IsPrime(0)); 86 EXPECT_FALSE(table_->IsPrime(1)); 87 EXPECT_FALSE(table_->IsPrime(4)); 88 EXPECT_FALSE(table_->IsPrime(6)); 89 EXPECT_FALSE(table_->IsPrime(100)); 90 } 91 92 TEST_P(PrimeTableTest, ReturnsTrueForPrimes) { 93 EXPECT_TRUE(table_->IsPrime(2)); 94 EXPECT_TRUE(table_->IsPrime(3)); 95 EXPECT_TRUE(table_->IsPrime(5)); 96 EXPECT_TRUE(table_->IsPrime(7)); 97 EXPECT_TRUE(table_->IsPrime(11)); 98 EXPECT_TRUE(table_->IsPrime(131)); 99 } 100 101 TEST_P(PrimeTableTest, CanGetNextPrime) { 102 EXPECT_EQ(2, table_->GetNextPrime(0)); 103 EXPECT_EQ(3, table_->GetNextPrime(2)); 104 EXPECT_EQ(5, table_->GetNextPrime(3)); 105 EXPECT_EQ(7, table_->GetNextPrime(5)); 106 EXPECT_EQ(11, table_->GetNextPrime(7)); 107 EXPECT_EQ(131, table_->GetNextPrime(128)); 108 } 109 110 // In order to run value-parameterized tests, you need to instantiate them, 111 // or bind them to a list of values which will be used as test parameters. 112 // You can instantiate them in a different translation module, or even 113 // instantiate them several times. 114 // 115 // Here, we instantiate our tests with a list of two PrimeTable object 116 // factory functions: 117 INSTANTIATE_TEST_CASE_P( 118 OnTheFlyAndPreCalculated, 119 PrimeTableTest, 120 Values(&CreateOnTheFlyPrimeTable, &CreatePreCalculatedPrimeTable<1000>)); 121 122 #else 123 124 // Google Test doesn't support value-parameterized tests on some platforms 125 // and compilers, such as MSVC 7.1. If we use conditional compilation to 126 // compile out all code referring to the gtest_main library, MSVC linker 127 // will not link that library at all and consequently complain about 128 // missing entry point defined in that library (fatal error LNK1561: 129 // entry point must be defined). This dummy test keeps gtest_main linked in. 130 TEST(DummyTest, ValueParameterizedTestsAreNotSupportedOnThisPlatform) {} 131 132 #endif // GTEST_HAS_PARAM_TEST 133
