Tools/TestWebKitAPI/Tests/WTF/Observer.cpp

/*
 * Copyright (C) 2020 Apple 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:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. 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.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS 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 APPLE INC. OR ITS 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.
 */

#include "config.h"
#include <wtf/Observer.h>

namespace TestWebKitAPI {

TEST(WTF_Observer, Basic)
{
    bool testValue = false;

    Observer<void(bool)> observer([&] (bool value) {
        testValue = value;
    });

    observer(true);

    EXPECT_TRUE(testValue);
}

TEST(WTF_Observer, Weak)
{
    bool testValue = false;

    auto uniqueObserver = WTF::makeUnique<Observer<void(bool)>>([&] (bool value) {
        testValue = value;
    });

    WeakPtr weakObserver = uniqueObserver.get();

    ASSERT_TRUE(static_cast<bool>(weakObserver));

    (*weakObserver)(true);

    EXPECT_TRUE(testValue);

    uniqueObserver = nullptr;

    EXPECT_FALSE(static_cast<bool>(weakObserver));
}


}