sample10_unittest.cc

// 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.
//
// Author: vladl@google.com (Vlad Losev)

// 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::TestCase;
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.
  virtual void OnTestStart(const TestInfo& /* test_info */) {
    initially_allocated_ = Water::allocated();
  }

  // Called after a test ends.
  virtual void OnTestEnd(const TestInfo& /* test_info */) {
    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 != NULL);
}

}  // 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();
}
	// 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.
	//
	// Author: vladl@google.com (Vlad Losev)

	// 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::TestCase;
	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.
	virtual void OnTestStart(const TestInfo& /* test_info */) {
	initially_allocated_ = Water::allocated();
	}

	// Called after a test ends.
	virtual void OnTestEnd(const TestInfo& /* test_info */) {
	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 != NULL);
	}

	} // 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();
	}