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29 //
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, to prevent a test from affecting the tests that come
49 // after it, you should create and destroy the tested objects for each test
50 // instead of reusing them. In this sample we will define a simple factory
51 // function for PrimeTable objects. We will instantiate objects in test's
52 // SetUp() method and delete them in TearDown() method.
53 typedef PrimeTable* CreatePrimeTableFunc();
54
CreateOnTheFlyPrimeTable()55 PrimeTable* CreateOnTheFlyPrimeTable() {
56 return new OnTheFlyPrimeTable();
57 }
58
59 template <size_t max_precalculated>
CreatePreCalculatedPrimeTable()60 PrimeTable* CreatePreCalculatedPrimeTable() {
61 return new PreCalculatedPrimeTable(max_precalculated);
62 }
63
64 // Inside the test body, fixture constructor, SetUp(), and TearDown() you
65 // can refer to the test parameter by GetParam(). In this case, the test
66 // parameter is a factory function which we call in fixture's SetUp() to
67 // create and store an instance of PrimeTable.
68 class PrimeTableTest : public TestWithParam<CreatePrimeTableFunc*> {
69 public:
~PrimeTableTest()70 virtual ~PrimeTableTest() { delete table_; }
SetUp()71 virtual void SetUp() { table_ = (*GetParam())(); }
TearDown()72 virtual void TearDown() {
73 delete table_;
74 table_ = NULL;
75 }
76
77 protected:
78 PrimeTable* table_;
79 };
80
TEST_P(PrimeTableTest,ReturnsFalseForNonPrimes)81 TEST_P(PrimeTableTest, ReturnsFalseForNonPrimes) {
82 EXPECT_FALSE(table_->IsPrime(-5));
83 EXPECT_FALSE(table_->IsPrime(0));
84 EXPECT_FALSE(table_->IsPrime(1));
85 EXPECT_FALSE(table_->IsPrime(4));
86 EXPECT_FALSE(table_->IsPrime(6));
87 EXPECT_FALSE(table_->IsPrime(100));
88 }
89
TEST_P(PrimeTableTest,ReturnsTrueForPrimes)90 TEST_P(PrimeTableTest, ReturnsTrueForPrimes) {
91 EXPECT_TRUE(table_->IsPrime(2));
92 EXPECT_TRUE(table_->IsPrime(3));
93 EXPECT_TRUE(table_->IsPrime(5));
94 EXPECT_TRUE(table_->IsPrime(7));
95 EXPECT_TRUE(table_->IsPrime(11));
96 EXPECT_TRUE(table_->IsPrime(131));
97 }
98
TEST_P(PrimeTableTest,CanGetNextPrime)99 TEST_P(PrimeTableTest, CanGetNextPrime) {
100 EXPECT_EQ(2, table_->GetNextPrime(0));
101 EXPECT_EQ(3, table_->GetNextPrime(2));
102 EXPECT_EQ(5, table_->GetNextPrime(3));
103 EXPECT_EQ(7, table_->GetNextPrime(5));
104 EXPECT_EQ(11, table_->GetNextPrime(7));
105 EXPECT_EQ(131, table_->GetNextPrime(128));
106 }
107
108 // In order to run value-parameterized tests, you need to instantiate them,
109 // or bind them to a list of values which will be used as test parameters.
110 // You can instantiate them in a different translation module, or even
111 // instantiate them several times.
112 //
113 // Here, we instantiate our tests with a list of two PrimeTable object
114 // factory functions:
115 INSTANTIATE_TEST_CASE_P(
116 OnTheFlyAndPreCalculated,
117 PrimeTableTest,
118 Values(&CreateOnTheFlyPrimeTable, &CreatePreCalculatedPrimeTable<1000>));
119
120 #else
121
122 // Google Test may not support value-parameterized tests with some
123 // compilers. If we use conditional compilation to compile out all
124 // code referring to the gtest_main library, MSVC linker will not link
125 // that library at all and consequently complain about missing entry
126 // point defined in that library (fatal error LNK1561: entry point
127 // must be defined). This dummy test keeps gtest_main linked in.
TEST(DummyTest,ValueParameterizedTestsAreNotSupportedOnThisPlatform)128 TEST(DummyTest, ValueParameterizedTestsAreNotSupportedOnThisPlatform) {}
129
130 #endif // GTEST_HAS_PARAM_TEST
131