yaml-cpp

sample10_unittest.cc (4985B)

---

 // Copyright 2009 Google Inc. All Rights Reserved.
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 // notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 // copyright notice, this list of conditions and the following disclaimer
 // in the documentation and/or other materials provided with the
 // distribution.
 //     * Neither the name of Google Inc. nor the names of its
 // contributors may be used to endorse or promote products derived from
 // this software without specific prior written permission.
 //
 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 
 // This sample shows how to use Google Test listener API to implement
 // a primitive leak checker.
 
 #include <stdio.h>
 #include <stdlib.h>
 
 #include "gtest/gtest.h"
 using ::testing::EmptyTestEventListener;
 using ::testing::InitGoogleTest;
 using ::testing::Test;
 using ::testing::TestEventListeners;
 using ::testing::TestInfo;
 using ::testing::TestPartResult;
 using ::testing::UnitTest;
 
 namespace {
 // We will track memory used by this class.
 class Water {
  public:
   // Normal Water declarations go here.
 
   // operator new and operator delete help us control water allocation.
   void* operator new(size_t allocation_size) {
     allocated_++;
     return malloc(allocation_size);
   }
 
   void operator delete(void* block, size_t /* allocation_size */) {
     allocated_--;
     free(block);
   }
 
   static int allocated() { return allocated_; }
 
  private:
   static int allocated_;
 };
 
 int Water::allocated_ = 0;
 
 // This event listener monitors how many Water objects are created and
 // destroyed by each test, and reports a failure if a test leaks some Water
 // objects. It does this by comparing the number of live Water objects at
 // the beginning of a test and at the end of a test.
 class LeakChecker : public EmptyTestEventListener {
  private:
   // Called before a test starts.
   void OnTestStart(const TestInfo& /* test_info */) override {
     initially_allocated_ = Water::allocated();
   }
 
   // Called after a test ends.
   void OnTestEnd(const TestInfo& /* test_info */) override {
     int difference = Water::allocated() - initially_allocated_;
 
     // You can generate a failure in any event handler except
     // OnTestPartResult. Just use an appropriate Google Test assertion to do
     // it.
     EXPECT_LE(difference, 0) << "Leaked " << difference << " unit(s) of Water!";
   }
 
   int initially_allocated_;
 };
 
 TEST(ListenersTest, DoesNotLeak) {
   Water* water = new Water;
   delete water;
 }
 
 // This should fail when the --check_for_leaks command line flag is
 // specified.
 TEST(ListenersTest, LeaksWater) {
   Water* water = new Water;
   EXPECT_TRUE(water != nullptr);
 }
 }  // namespace
 
 int main(int argc, char **argv) {
   InitGoogleTest(&argc, argv);
 
   bool check_for_leaks = false;
   if (argc > 1 && strcmp(argv[1], "--check_for_leaks") == 0 )
     check_for_leaks = true;
   else
     printf("%s\n", "Run this program with --check_for_leaks to enable "
            "custom leak checking in the tests.");
 
   // If we are given the --check_for_leaks command line flag, installs the
   // leak checker.
   if (check_for_leaks) {
     TestEventListeners& listeners = UnitTest::GetInstance()->listeners();
 
     // Adds the leak checker to the end of the test event listener list,
     // after the default text output printer and the default XML report
     // generator.
     //
     // The order is important - it ensures that failures generated in the
     // leak checker's OnTestEnd() method are processed by the text and XML
     // printers *before* their OnTestEnd() methods are called, such that
     // they are attributed to the right test. Remember that a listener
     // receives an OnXyzStart event *after* listeners preceding it in the
     // list received that event, and receives an OnXyzEnd event *before*
     // listeners preceding it.
     //
     // We don't need to worry about deleting the new listener later, as
     // Google Test will do it.
     listeners.Append(new LeakChecker);
   }
   return RUN_ALL_TESTS();
 }