ceph/src/rapidjson/thirdparty/gtest/googletest/samples/sample10_unittest.cc

   1 // Copyright 2009 Google Inc. All Rights Reserved.
   2 //
   3 // Redistribution and use in source and binary forms, with or without
   4 // modification, are permitted provided that the following conditions are
   5 // met:
   6 //
   7 //     * Redistributions of source code must retain the above copyright
   8 // notice, this list of conditions and the following disclaimer.
   9 //     * Redistributions in binary form must reproduce the above
  10 // copyright notice, this list of conditions and the following disclaimer
  11 // in the documentation and/or other materials provided with the
  12 // distribution.
  13 //     * Neither the name of Google Inc. nor the names of its
  14 // contributors may be used to endorse or promote products derived from
  15 // this software without specific prior written permission.
  16 //
  17 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  18 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  19 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  20 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  21 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  22 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  23 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  24 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  25 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  26 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  27 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  28 //
  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;
  40 using ::testing::InitGoogleTest;
  41 using ::testing::Test;
  42 using ::testing::TestCase;
  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 }