ceph/src/googletest/googletest/samples/sample3_unittest.cc

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  29
  30 // A sample program demonstrating using Google C++ testing framework.
  31 //
  32 // Author: wan@google.com (Zhanyong Wan)
  33
  34
  35 // In this example, we use a more advanced feature of Google Test called
  36 // test fixture.
  37 //
  38 // A test fixture is a place to hold objects and functions shared by
  39 // all tests in a test case.  Using a test fixture avoids duplicating
  40 // the test code necessary to initialize and cleanup those common
  41 // objects for each test.  It is also useful for defining sub-routines
  42 // that your tests need to invoke a lot.
  43 //
  44 // <TechnicalDetails>
  45 //
  46 // The tests share the test fixture in the sense of code sharing, not
  47 // data sharing.  Each test is given its own fresh copy of the
  48 // fixture.  You cannot expect the data modified by one test to be
  49 // passed on to another test, which is a bad idea.
  50 //
  51 // The reason for this design is that tests should be independent and
  52 // repeatable.  In particular, a test should not fail as the result of
  53 // another test's failure.  If one test depends on info produced by
  54 // another test, then the two tests should really be one big test.
  55 //
  56 // The macros for indicating the success/failure of a test
  57 // (EXPECT_TRUE, FAIL, etc) need to know what the current test is
  58 // (when Google Test prints the test result, it tells you which test
  59 // each failure belongs to).  Technically, these macros invoke a
  60 // member function of the Test class.  Therefore, you cannot use them
  61 // in a global function.  That's why you should put test sub-routines
  62 // in a test fixture.
  63 //
  64 // </TechnicalDetails>
  65
  66 #include "sample3-inl.h"
  67 #include "gtest/gtest.h"
  68
  69 // To use a test fixture, derive a class from testing::Test.
  70 class QueueTest : public testing::Test {
  71  protected:  // You should make the members protected s.t. they can be
  72              // accessed from sub-classes.
  73
  74   // virtual void SetUp() will be called before each test is run.  You
  75   // should define it if you need to initialize the varaibles.
  76   // Otherwise, this can be skipped.
  77   virtual void SetUp() {
  78     q1_.Enqueue(1);
  79     q2_.Enqueue(2);
  80     q2_.Enqueue(3);
  81   }
  82
  83   // virtual void TearDown() will be called after each test is run.
  84   // You should define it if there is cleanup work to do.  Otherwise,
  85   // you don't have to provide it.
  86   //
  87   // virtual void TearDown() {
  88   // }
  89
  90   // A helper function that some test uses.
  91   static int Double(int n) {
  92     return 2*n;
  93   }
  94
  95   // A helper function for testing Queue::Map().
  96   void MapTester(const Queue<int> * q) {
  97     // Creates a new queue, where each element is twice as big as the
  98     // corresponding one in q.
  99     const Queue<int> * const new_q = q->Map(Double);
 100
 101     // Verifies that the new queue has the same size as q.
 102     ASSERT_EQ(q->Size(), new_q->Size());
 103
 104     // Verifies the relationship between the elements of the two queues.
 105     for ( const QueueNode<int> * n1 = q->Head(), * n2 = new_q->Head();
 106           n1 != NULL; n1 = n1->next(), n2 = n2->next() ) {
 107       EXPECT_EQ(2 * n1->element(), n2->element());
 108     }
 109
 110     delete new_q;
 111   }
 112
 113   // Declares the variables your tests want to use.
 114   Queue<int> q0_;
 115   Queue<int> q1_;
 116   Queue<int> q2_;
 117 };
 118
 119 // When you have a test fixture, you define a test using TEST_F
 120 // instead of TEST.
 121
 122 // Tests the default c'tor.
 123 TEST_F(QueueTest, DefaultConstructor) {
 124   // You can access data in the test fixture here.
 125   EXPECT_EQ(0u, q0_.Size());
 126 }
 127
 128 // Tests Dequeue().
 129 TEST_F(QueueTest, Dequeue) {
 130   int * n = q0_.Dequeue();
 131   EXPECT_TRUE(n == NULL);
 132
 133   n = q1_.Dequeue();
 134   ASSERT_TRUE(n != NULL);
 135   EXPECT_EQ(1, *n);
 136   EXPECT_EQ(0u, q1_.Size());
 137   delete n;
 138
 139   n = q2_.Dequeue();
 140   ASSERT_TRUE(n != NULL);
 141   EXPECT_EQ(2, *n);
 142   EXPECT_EQ(1u, q2_.Size());
 143   delete n;
 144 }
 145
 146 // Tests the Queue::Map() function.
 147 TEST_F(QueueTest, Map) {
 148   MapTester(&q0_);
 149   MapTester(&q1_);
 150   MapTester(&q2_);
 151 }