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// Copyright 2009 Google Inc. All Rights Reserved.
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following disclaimer
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// in the documentation and/or other materials provided with the
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived from
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// this software without specific prior written permission.
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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// Author: vladl@google.com (Vlad Losev)
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// This sample shows how to use Google Test listener API to implement
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// a primitive leak checker.
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#include <gtest/gtest.h>
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using ::testing::EmptyTestEventListener;
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using ::testing::InitGoogleTest;
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using ::testing::Test;
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using ::testing::TestCase;
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using ::testing::TestEventListeners;
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using ::testing::TestInfo;
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using ::testing::TestPartResult;
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using ::testing::UnitTest;
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// We will track memory used by this class.
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// Normal Water declarations go here.
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// operator new and operator delete help us control water allocation.
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void* operator new(size_t allocation_size) {
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return malloc(allocation_size);
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void operator delete(void* block, size_t /* allocation_size */) {
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static int allocated() { return allocated_; }
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static int allocated_;
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int Water::allocated_ = 0;
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// This event listener monitors how many Water objects are created and
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// destroyed by each test, and reports a failure if a test leaks some Water
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// objects. It does this by comparing the number of live Water objects at
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// the beginning of a test and at the end of a test.
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class LeakChecker : public EmptyTestEventListener {
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// Called before a test starts.
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virtual void OnTestStart(const TestInfo& /* test_info */) {
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initially_allocated_ = Water::allocated();
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// Called after a test ends.
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virtual void OnTestEnd(const TestInfo& /* test_info */) {
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int difference = Water::allocated() - initially_allocated_;
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// You can generate a failure in any event handler except
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// OnTestPartResult. Just use an appropriate Google Test assertion to do
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EXPECT_TRUE(difference <= 0)
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<< "Leaked " << difference << " unit(s) of Water!";
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int initially_allocated_;
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TEST(ListenersTest, DoesNotLeak) {
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Water* water = new Water;
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// This should fail when the --check_for_leaks command line flag is
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TEST(ListenersTest, LeaksWater) {
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Water* water = new Water;
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EXPECT_TRUE(water != NULL);
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int main(int argc, char **argv) {
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InitGoogleTest(&argc, argv);
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bool check_for_leaks = false;
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if (argc > 1 && strcmp(argv[1], "--check_for_leaks") == 0 )
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check_for_leaks = true;
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printf("%s\n", "Run this program with --check_for_leaks to enable "
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"custom leak checking in the tests.");
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// If we are given the --check_for_leaks command line flag, installs the
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if (check_for_leaks) {
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TestEventListeners& listeners = UnitTest::GetInstance()->listeners();
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// Adds the leak checker to the end of the test event listener list,
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// after the default text output printer and the default XML report
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// The order is important - it ensures that failures generated in the
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// leak checker's OnTestEnd() method are processed by the text and XML
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// printers *before* their OnTestEnd() methods are called, such that
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// they are attributed to the right test. Remember that a listener
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// receives an OnXyzStart event *after* listeners preceding it in the
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// list received that event, and receives an OnXyzEnd event *before*
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// listeners preceding it.
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// We don't need to worry about deleting the new listener later, as
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// Google Test will do it.
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listeners.Append(new LeakChecker);
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return RUN_ALL_TESTS();
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src/gtest/samples/sample10_unittest.cc
