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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
45using ::testing::TestWithParam;
46using ::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.
53typedef PrimeTable* CreatePrimeTableFunc();
54
55PrimeTable* CreateOnTheFlyPrimeTable() {
56  return new OnTheFlyPrimeTable();
57}
58
59template <size_t max_precalculated>
60PrimeTable* 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.
68class PrimeTableTest : public TestWithParam<CreatePrimeTableFunc*> {
69 public:
70  virtual ~PrimeTableTest() { delete table_; }
71  virtual void SetUp() { table_ = (*GetParam())(); }
72  virtual void TearDown() {
73    delete table_;
74    table_ = NULL;
75  }
76
77 protected:
78  PrimeTable* table_;
79};
80
81TEST_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
90TEST_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
99TEST_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:
115INSTANTIATE_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.
128TEST(DummyTest, ValueParameterizedTestsAreNotSupportedOnThisPlatform) {}
129
130#endif  // GTEST_HAS_PARAM_TEST
131