third_party/WebKit/Source/core/loader/DocumentLoadTimingTest.cpp

// Copyright 2016 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "core/loader/DocumentLoadTiming.h"

#include "core/loader/DocumentLoader.h"
#include "core/testing/DummyPageHolder.h"
#include "testing/gtest/include/gtest/gtest.h"

namespace blink {

class DocumentLoadTimingTest : public testing::Test {
};

TEST_F(DocumentLoadTimingTest, ensureValidNavigationStartAfterEmbedder)
{
    OwnPtr<DummyPageHolder> dummyPage = DummyPageHolder::create();
    DocumentLoadTiming timing(*(dummyPage->document().loader()));

    double delta = -1000;
    double embedderNavigationStart = monotonicallyIncreasingTime() + delta;
    timing.setNavigationStart(embedderNavigationStart);

    double realWallTime = currentTime();
    double adjustedWallTime = timing.monotonicTimeToPseudoWallTime(timing.navigationStart());

    EXPECT_NEAR(adjustedWallTime, realWallTime + delta, .001);
}

TEST_F(DocumentLoadTimingTest, correctTimingDeltas)
{
    OwnPtr<DummyPageHolder> dummyPage = DummyPageHolder::create();
    DocumentLoadTiming timing(*(dummyPage->document().loader()));

    double navigationStartDelta = -456;
    double currentMonotonicTime = monotonicallyIncreasingTime();
    double embedderNavigationStart = currentMonotonicTime + navigationStartDelta;

    timing.setNavigationStart(embedderNavigationStart);

    // Super quick load! Expect the wall time reported by this event to be
    // dominated by the navigationStartDelta, but similar to currentTime().
    timing.markLoadEventEnd();
    double realWallLoadEventEnd = currentTime();
    double adjustedLoadEventEnd = timing.monotonicTimeToPseudoWallTime(timing.loadEventEnd());

    EXPECT_NEAR(adjustedLoadEventEnd, realWallLoadEventEnd, .001);

    double adjustedNavigationStart = timing.monotonicTimeToPseudoWallTime(timing.navigationStart());
    EXPECT_NEAR(adjustedLoadEventEnd - adjustedNavigationStart, -navigationStartDelta, .001);
}

} // namespace blink