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sample10_unittest.cc
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29 // Author: vladl@google.com (Vlad Losev)
30 
31 // This sample shows how to use Google Test listener API to implement
32 // a primitive leak checker.
33 
34 #include <stdio.h>
35 #include <stdlib.h>
36 
37 #include "gtest/gtest.h"
38 
39 using ::testing::EmptyTestEventListener;
41 using ::testing::Test;
43 using ::testing::TestEventListeners;
44 using ::testing::TestInfo;
45 using ::testing::TestPartResult;
46 using ::testing::UnitTest;
47 
48 namespace {
49 
50 // We will track memory used by this class.
51 class Water {
52  public:
53  // Normal Water declarations go here.
54 
55  // operator new and operator delete help us control water allocation.
56  void* operator new(size_t allocation_size) {
57  allocated_++;
58  return malloc(allocation_size);
59  }
60 
61  void operator delete(void* block, size_t /* allocation_size */) {
62  allocated_--;
63  free(block);
64  }
65 
66  static int allocated() { return allocated_; }
67 
68  private:
69  static int allocated_;
70 };
71 
72 int Water::allocated_ = 0;
73 
74 // This event listener monitors how many Water objects are created and
75 // destroyed by each test, and reports a failure if a test leaks some Water
76 // objects. It does this by comparing the number of live Water objects at
77 // the beginning of a test and at the end of a test.
78 class LeakChecker : public EmptyTestEventListener {
79  private:
80  // Called before a test starts.
81  virtual void OnTestStart(const TestInfo& /* test_info */) {
82  initially_allocated_ = Water::allocated();
83  }
84 
85  // Called after a test ends.
86  virtual void OnTestEnd(const TestInfo& /* test_info */) {
87  int difference = Water::allocated() - initially_allocated_;
88 
89  // You can generate a failure in any event handler except
90  // OnTestPartResult. Just use an appropriate Google Test assertion to do
91  // it.
92  EXPECT_LE(difference, 0) << "Leaked " << difference << " unit(s) of Water!";
93  }
94 
95  int initially_allocated_;
96 };
97 
98 TEST(ListenersTest, DoesNotLeak) {
99  Water* water = new Water;
100  delete water;
101 }
102 
103 // This should fail when the --check_for_leaks command line flag is
104 // specified.
105 TEST(ListenersTest, LeaksWater) {
106  Water* water = new Water;
107  EXPECT_TRUE(water != NULL);
108 }
109 
110 } // namespace
111 
112 int main(int argc, char **argv) {
113  InitGoogleTest(&argc, argv);
114 
115  bool check_for_leaks = false;
116  if (argc > 1 && strcmp(argv[1], "--check_for_leaks") == 0 )
117  check_for_leaks = true;
118  else
119  printf("%s\n", "Run this program with --check_for_leaks to enable "
120  "custom leak checking in the tests.");
121 
122  // If we are given the --check_for_leaks command line flag, installs the
123  // leak checker.
124  if (check_for_leaks) {
125  TestEventListeners& listeners = UnitTest::GetInstance()->listeners();
126 
127  // Adds the leak checker to the end of the test event listener list,
128  // after the default text output printer and the default XML report
129  // generator.
130  //
131  // The order is important - it ensures that failures generated in the
132  // leak checker's OnTestEnd() method are processed by the text and XML
133  // printers *before* their OnTestEnd() methods are called, such that
134  // they are attributed to the right test. Remember that a listener
135  // receives an OnXyzStart event *after* listeners preceding it in the
136  // list received that event, and receives an OnXyzEnd event *before*
137  // listeners preceding it.
138  //
139  // We don't need to worry about deleting the new listener later, as
140  // Google Test will do it.
141  listeners.Append(new LeakChecker);
142  }
143  return RUN_ALL_TESTS();
144 }