Source/core/animation/AnimationClockTest.cpp

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#include "config.h"
#include "core/animation/AnimationClock.h"

#include "wtf/OwnPtr.h"
#include <gtest/gtest.h>

using namespace blink;

namespace {

class AnimationAnimationClockTest : public ::testing::Test {
public:
    AnimationAnimationClockTest()
        : animationClock(mockTimeFunction)
    { }
protected:
    virtual void SetUp()
    {
        mockTime = 0;
        animationClock.resetTimeForTesting();
    }

    static double mockTimeFunction()
    {
        return mockTime;
    }

    static double mockTime;
    AnimationClock animationClock;
};

double AnimationAnimationClockTest::mockTime;

TEST_F(AnimationAnimationClockTest, TimeIsGreaterThanZeroForUnitTests)
{
    AnimationClock clock;
    // unit tests outside core/animation shouldn't need to do anything to get
    // a non-zero currentTime().
    EXPECT_GT(clock.currentTime(), 0);
}

TEST_F(AnimationAnimationClockTest, TimeDoesNotChange)
{
    animationClock.updateTime(100);
    EXPECT_EQ(100, animationClock.currentTime());
    EXPECT_EQ(100, animationClock.currentTime());
}

TEST_F(AnimationAnimationClockTest, TimeAdvancesWhenUpdated)
{
    animationClock.updateTime(100);
    EXPECT_EQ(100, animationClock.currentTime());

    animationClock.updateTime(200);
    EXPECT_EQ(200, animationClock.currentTime());
}

TEST_F(AnimationAnimationClockTest, TimeAdvancesToTaskTime)
{
    animationClock.updateTime(100);
    EXPECT_EQ(100, animationClock.currentTime());

    mockTime = 150;
    AnimationClock::notifyTaskStart();
    EXPECT_GE(animationClock.currentTime(), mockTime);
}

TEST_F(AnimationAnimationClockTest, TimeAdvancesToTaskTimeOnlyWhenRequired)
{
    animationClock.updateTime(100);
    EXPECT_EQ(100, animationClock.currentTime());

    AnimationClock::notifyTaskStart();
    animationClock.updateTime(125);
    EXPECT_EQ(125, animationClock.currentTime());
}

TEST_F(AnimationAnimationClockTest, UpdateTimeIsMonotonic)
{
    animationClock.updateTime(100);
    EXPECT_EQ(100, animationClock.currentTime());

    // Update can't go backwards.
    animationClock.updateTime(50);
    EXPECT_EQ(100, animationClock.currentTime());

    mockTime = 50;
    AnimationClock::notifyTaskStart();
    EXPECT_EQ(100, animationClock.currentTime());

    mockTime = 150;
    AnimationClock::notifyTaskStart();
    EXPECT_GE(animationClock.currentTime(), mockTime);

    // Update can't go backwards after advance to estimate.
    animationClock.updateTime(100);
    EXPECT_GE(animationClock.currentTime(), mockTime);
}

TEST_F(AnimationAnimationClockTest, CurrentTimeUpdatesTask)
{
    animationClock.updateTime(100);
    EXPECT_EQ(100, animationClock.currentTime());

    mockTime = 100;
    AnimationClock::notifyTaskStart();
    EXPECT_EQ(100, animationClock.currentTime());

    mockTime = 150;
    EXPECT_EQ(100, animationClock.currentTime());
}

}