Tools/TestWebKitAPI/TestUtilities.cpp

/*
 * Copyright (C) 2021 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:
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 *    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
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#include "config.h"
#include "TestUtilities.h"

#import <wtf/MemoryFootprint.h>

namespace TestWebKitAPI {

::testing::AssertionResult memoryFootprintChangedBy(size_t& lastFootprint, double expectedChange, double error)
{
    WTF::releaseFastMallocFreeMemory();
    size_t newFootprint = memoryFootprint();
    size_t oldFootprint = std::exchange(lastFootprint, newFootprint);
    double change = static_cast<double>(newFootprint) - oldFootprint;
    if (change - expectedChange > error)
        return ::testing::AssertionFailure() << "Footprint changed by " << change << ". Expected at most " << expectedChange << "+-" << error;
    return ::testing::AssertionSuccess();
}

}