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29
30 // This sample shows how to test common properties of multiple
31 // implementations of an interface (aka interface tests) using
32 // value-parameterized tests. Each test in the test case has
33 // a parameter that is an interface pointer to an implementation
34 // tested.
35
36 // The interface and its implementations are in this header.
37 #include "prime_tables.h"
38 #include "gtest/gtest.h"
39 namespace {
40
41 using ::testing::TestWithParam;
42 using ::testing::Values;
43
44 // As a general rule, to prevent a test from affecting the tests that come
45 // after it, you should create and destroy the tested objects for each test
46 // instead of reusing them. In this sample we will define a simple factory
47 // function for PrimeTable objects. We will instantiate objects in test's
48 // SetUp() method and delete them in TearDown() method.
49 typedef PrimeTable* CreatePrimeTableFunc();
50
CreateOnTheFlyPrimeTable()51 PrimeTable* CreateOnTheFlyPrimeTable() { return new OnTheFlyPrimeTable(); }
52
53 template <size_t max_precalculated>
CreatePreCalculatedPrimeTable()54 PrimeTable* CreatePreCalculatedPrimeTable() {
55 return new PreCalculatedPrimeTable(max_precalculated);
56 }
57
58 // Inside the test body, fixture constructor, SetUp(), and TearDown() you
59 // can refer to the test parameter by GetParam(). In this case, the test
60 // parameter is a factory function which we call in fixture's SetUp() to
61 // create and store an instance of PrimeTable.
62 class PrimeTableTestSmpl7 : public TestWithParam<CreatePrimeTableFunc*> {
63 public:
~PrimeTableTestSmpl7()64 ~PrimeTableTestSmpl7() override { delete table_; }
SetUp()65 void SetUp() override { table_ = (*GetParam())(); }
TearDown()66 void TearDown() override {
67 delete table_;
68 table_ = nullptr;
69 }
70
71 protected:
72 PrimeTable* table_;
73 };
74
TEST_P(PrimeTableTestSmpl7,ReturnsFalseForNonPrimes)75 TEST_P(PrimeTableTestSmpl7, ReturnsFalseForNonPrimes) {
76 EXPECT_FALSE(table_->IsPrime(-5));
77 EXPECT_FALSE(table_->IsPrime(0));
78 EXPECT_FALSE(table_->IsPrime(1));
79 EXPECT_FALSE(table_->IsPrime(4));
80 EXPECT_FALSE(table_->IsPrime(6));
81 EXPECT_FALSE(table_->IsPrime(100));
82 }
83
TEST_P(PrimeTableTestSmpl7,ReturnsTrueForPrimes)84 TEST_P(PrimeTableTestSmpl7, ReturnsTrueForPrimes) {
85 EXPECT_TRUE(table_->IsPrime(2));
86 EXPECT_TRUE(table_->IsPrime(3));
87 EXPECT_TRUE(table_->IsPrime(5));
88 EXPECT_TRUE(table_->IsPrime(7));
89 EXPECT_TRUE(table_->IsPrime(11));
90 EXPECT_TRUE(table_->IsPrime(131));
91 }
92
TEST_P(PrimeTableTestSmpl7,CanGetNextPrime)93 TEST_P(PrimeTableTestSmpl7, CanGetNextPrime) {
94 EXPECT_EQ(2, table_->GetNextPrime(0));
95 EXPECT_EQ(3, table_->GetNextPrime(2));
96 EXPECT_EQ(5, table_->GetNextPrime(3));
97 EXPECT_EQ(7, table_->GetNextPrime(5));
98 EXPECT_EQ(11, table_->GetNextPrime(7));
99 EXPECT_EQ(131, table_->GetNextPrime(128));
100 }
101
102 // In order to run value-parameterized tests, you need to instantiate them,
103 // or bind them to a list of values which will be used as test parameters.
104 // You can instantiate them in a different translation module, or even
105 // instantiate them several times.
106 //
107 // Here, we instantiate our tests with a list of two PrimeTable object
108 // factory functions:
109 INSTANTIATE_TEST_SUITE_P(OnTheFlyAndPreCalculated, PrimeTableTestSmpl7,
110 Values(&CreateOnTheFlyPrimeTable,
111 &CreatePreCalculatedPrimeTable<1000>));
112
113 } // namespace
114