| // 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/paint/FirstMeaningfulPaintDetector.h" |
| |
| #include "core/paint/PaintTiming.h" |
| #include "core/testing/DummyPageHolder.h" |
| #include "testing/gtest/include/gtest/gtest.h" |
| |
| namespace blink { |
| |
| class FirstMeaningfulPaintDetectorTest : public testing::Test { |
| protected: |
| void SetUp() override |
| { |
| m_dummyPageHolder = DummyPageHolder::create(IntSize(800, 600)); |
| s_timeElapsed = 0.0; |
| m_originalTimeFunction = setTimeFunctionsForTesting(returnMockTime); |
| } |
| |
| void TearDown() override |
| { |
| setTimeFunctionsForTesting(m_originalTimeFunction); |
| } |
| |
| Document& document() { return m_dummyPageHolder->document(); } |
| PaintTiming& paintTiming() { return PaintTiming::from(document()); } |
| FirstMeaningfulPaintDetector& detector() { return paintTiming().firstMeaningfulPaintDetector(); } |
| |
| void simulateLayoutAndPaint(int newElements) |
| { |
| StringBuilder builder; |
| for (int i = 0; i < newElements; i++) |
| builder.append("<span>a</span>"); |
| document().write(builder.toString()); |
| document().updateStyleAndLayout(); |
| detector().notifyPaint(); |
| } |
| |
| void simulateNetworkStable() |
| { |
| detector().networkStableTimerFired(nullptr); |
| } |
| |
| private: |
| static double returnMockTime() |
| { |
| s_timeElapsed += 1.0; |
| return s_timeElapsed; |
| } |
| |
| std::unique_ptr<DummyPageHolder> m_dummyPageHolder; |
| TimeFunction m_originalTimeFunction; |
| static double s_timeElapsed; |
| }; |
| |
| double FirstMeaningfulPaintDetectorTest::s_timeElapsed; |
| |
| TEST_F(FirstMeaningfulPaintDetectorTest, NoFirstPaint) |
| { |
| simulateLayoutAndPaint(1); |
| simulateNetworkStable(); |
| EXPECT_EQ(paintTiming().firstMeaningfulPaint(), 0.0); |
| } |
| |
| TEST_F(FirstMeaningfulPaintDetectorTest, OneLayout) |
| { |
| paintTiming().markFirstPaint(); |
| simulateLayoutAndPaint(1); |
| double afterPaint = monotonicallyIncreasingTime(); |
| EXPECT_EQ(paintTiming().firstMeaningfulPaint(), 0.0); |
| simulateNetworkStable(); |
| EXPECT_GT(paintTiming().firstMeaningfulPaint(), paintTiming().firstPaint()); |
| EXPECT_LT(paintTiming().firstMeaningfulPaint(), afterPaint); |
| } |
| |
| TEST_F(FirstMeaningfulPaintDetectorTest, TwoLayoutsSignificantSecond) |
| { |
| paintTiming().markFirstPaint(); |
| simulateLayoutAndPaint(1); |
| double afterLayout1 = monotonicallyIncreasingTime(); |
| simulateLayoutAndPaint(10); |
| double afterLayout2 = monotonicallyIncreasingTime(); |
| simulateNetworkStable(); |
| EXPECT_GT(paintTiming().firstMeaningfulPaint(), afterLayout1); |
| EXPECT_LT(paintTiming().firstMeaningfulPaint(), afterLayout2); |
| } |
| |
| TEST_F(FirstMeaningfulPaintDetectorTest, TwoLayoutsSignificantFirst) |
| { |
| paintTiming().markFirstPaint(); |
| simulateLayoutAndPaint(10); |
| double afterLayout1 = monotonicallyIncreasingTime(); |
| simulateLayoutAndPaint(1); |
| simulateNetworkStable(); |
| EXPECT_GT(paintTiming().firstMeaningfulPaint(), paintTiming().firstPaint()); |
| EXPECT_LT(paintTiming().firstMeaningfulPaint(), afterLayout1); |
| } |
| |
| } // namespace blink |