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30 // Author: vladl@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
CreateOnTheFlyPrimeTable()56 PrimeTable* CreateOnTheFlyPrimeTable() {
57 return new OnTheFlyPrimeTable();
58 }
59
60 template <size_t max_precalculated>
CreatePreCalculatedPrimeTable()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:
~PrimeTableTest()72 virtual ~PrimeTableTest() { delete table_; }
SetUp()73 virtual void SetUp() { table_ = (*GetParam())(); }
TearDown()74 virtual void TearDown() {
75 delete table_;
76 table_ = NULL;
77 }
78
79 protected:
80 PrimeTable* table_;
81 };
82
TEST_P(PrimeTableTest,ReturnsFalseForNonPrimes)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
TEST_P(PrimeTableTest,ReturnsTrueForPrimes)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
TEST_P(PrimeTableTest,CanGetNextPrime)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.
TEST(DummyTest,ValueParameterizedTestsAreNotSupportedOnThisPlatform)130 TEST(DummyTest, ValueParameterizedTestsAreNotSupportedOnThisPlatform) {}
131
132 #endif // GTEST_HAS_PARAM_TEST
133