ceph/src/jaegertracing/opentelemetry-cpp/third_party/prometheus-cpp/3rdparty/googletest/googletest/samples/sample3_unittest.cc

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  29
  30 // A sample program demonstrating using Google C++ testing framework.
  31
  32 // In this example, we use a more advanced feature of Google Test called
  33 // test fixture.
  34 //
  35 // A test fixture is a place to hold objects and functions shared by
  36 // all tests in a test case.  Using a test fixture avoids duplicating
  37 // the test code necessary to initialize and cleanup those common
  38 // objects for each test.  It is also useful for defining sub-routines
  39 // that your tests need to invoke a lot.
  40 //
  41 // <TechnicalDetails>
  42 //
  43 // The tests share the test fixture in the sense of code sharing, not
  44 // data sharing.  Each test is given its own fresh copy of the
  45 // fixture.  You cannot expect the data modified by one test to be
  46 // passed on to another test, which is a bad idea.
  47 //
  48 // The reason for this design is that tests should be independent and
  49 // repeatable.  In particular, a test should not fail as the result of
  50 // another test's failure.  If one test depends on info produced by
  51 // another test, then the two tests should really be one big test.
  52 //
  53 // The macros for indicating the success/failure of a test
  54 // (EXPECT_TRUE, FAIL, etc) need to know what the current test is
  55 // (when Google Test prints the test result, it tells you which test
  56 // each failure belongs to).  Technically, these macros invoke a
  57 // member function of the Test class.  Therefore, you cannot use them
  58 // in a global function.  That's why you should put test sub-routines
  59 // in a test fixture.
  60 //
  61 // </TechnicalDetails>
  62
  63 #include "sample3-inl.h"
  64 #include "gtest/gtest.h"
  65 namespace {
  66 // To use a test fixture, derive a class from testing::Test.
  67 class QueueTestSmpl3 : public testing::Test {
  68  protected:  // You should make the members protected s.t. they can be
  69              // accessed from sub-classes.
  70
  71   // virtual void SetUp() will be called before each test is run.  You
  72   // should define it if you need to initialize the variables.
  73   // Otherwise, this can be skipped.
  74   void SetUp() override {
  75     q1_.Enqueue(1);
  76     q2_.Enqueue(2);
  77     q2_.Enqueue(3);
  78   }
  79
  80   // virtual void TearDown() will be called after each test is run.
  81   // You should define it if there is cleanup work to do.  Otherwise,
  82   // you don't have to provide it.
  83   //
  84   // virtual void TearDown() {
  85   // }
  86
  87   // A helper function that some test uses.
  88   static int Double(int n) {
  89     return 2*n;
  90   }
  91
  92   // A helper function for testing Queue::Map().
  93   void MapTester(const Queue<int> * q) {
  94     // Creates a new queue, where each element is twice as big as the
  95     // corresponding one in q.
  96     const Queue<int> * const new_q = q->Map(Double);
  97
  98     // Verifies that the new queue has the same size as q.
  99     ASSERT_EQ(q->Size(), new_q->Size());
 100
 101     // Verifies the relationship between the elements of the two queues.
 102     for (const QueueNode<int>*n1 = q->Head(), *n2 = new_q->Head();
 103          n1 != nullptr; n1 = n1->next(), n2 = n2->next()) {
 104       EXPECT_EQ(2 * n1->element(), n2->element());
 105     }
 106
 107     delete new_q;
 108   }
 109
 110   // Declares the variables your tests want to use.
 111   Queue<int> q0_;
 112   Queue<int> q1_;
 113   Queue<int> q2_;
 114 };
 115
 116 // When you have a test fixture, you define a test using TEST_F
 117 // instead of TEST.
 118
 119 // Tests the default c'tor.
 120 TEST_F(QueueTestSmpl3, DefaultConstructor) {
 121   // You can access data in the test fixture here.
 122   EXPECT_EQ(0u, q0_.Size());
 123 }
 124
 125 // Tests Dequeue().
 126 TEST_F(QueueTestSmpl3, Dequeue) {
 127   int * n = q0_.Dequeue();
 128   EXPECT_TRUE(n == nullptr);
 129
 130   n = q1_.Dequeue();
 131   ASSERT_TRUE(n != nullptr);
 132   EXPECT_EQ(1, *n);
 133   EXPECT_EQ(0u, q1_.Size());
 134   delete n;
 135
 136   n = q2_.Dequeue();
 137   ASSERT_TRUE(n != nullptr);
 138   EXPECT_EQ(2, *n);
 139   EXPECT_EQ(1u, q2_.Size());
 140   delete n;
 141 }
 142
 143 // Tests the Queue::Map() function.
 144 TEST_F(QueueTestSmpl3, Map) {
 145   MapTester(&q0_);
 146   MapTester(&q1_);
 147   MapTester(&q2_);
 148 }
 149 }  // namespace