Source/platform/animation/TimingFunctionTest.cpp - platform/external/chromium_org/third_party/WebKit - Git at Google

 /*
  * Copyright (c) 2013, Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * 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.
  *     * Neither the name of Google Inc. nor the names of its
  * contributors may be used to endorse or promote products derived from
  * this software without specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
  * OWNER OR 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 "platform/animation/TimingFunction.h"

 #include "wtf/text/WTFString.h"
 #include <gmock/gmock.h>
 #include <gtest/gtest.h>
 #include <sstream>
 #include <string>

 // Macro is only used to allow the use of streams.
 // Can be removed if a pretty failure message isn't needed.
 #define EXPECT_NE_WITH_MESSAGE(a, b) \
     EXPECT_NE(*a.second, *b.second) \
         << a.first \
         << " (" << a.second->toString().latin1().data() << ")" \
         << " ==  " \
         << b.first \
         << " (" << b.second->toString().latin1().data() << ")" \
         << "\n";

 namespace blink {

 namespace {

 class TimingFunctionTest : public ::testing::Test {
 public:
     void notEqualHelperLoop(Vector<std::pair<std::string, RefPtr<TimingFunction> > >& v)
     {
         for (size_t i = 0; i < v.size(); ++i) {
             for (size_t j = 0; j < v.size(); ++j) {
                 if (i == j)
                     continue;
                 EXPECT_NE_WITH_MESSAGE(v[i], v[j]);
             }
         }
     }
 };

 TEST_F(TimingFunctionTest, LinearToString)
 {
     RefPtr<TimingFunction> linearTiming = LinearTimingFunction::shared();
     EXPECT_EQ(linearTiming->toString(), "linear");
 }

 TEST_F(TimingFunctionTest, CubicToString)
 {
     RefPtr<TimingFunction> cubicEaseTiming = CubicBezierTimingFunction::preset(CubicBezierTimingFunction::Ease);
     EXPECT_EQ("ease", cubicEaseTiming->toString());
     RefPtr<TimingFunction> cubicEaseInTiming = CubicBezierTimingFunction::preset(CubicBezierTimingFunction::EaseIn);
     EXPECT_EQ("ease-in", cubicEaseInTiming->toString());
     RefPtr<TimingFunction> cubicEaseOutTiming = CubicBezierTimingFunction::preset(CubicBezierTimingFunction::EaseOut);
     EXPECT_EQ("ease-out", cubicEaseOutTiming->toString());
     RefPtr<TimingFunction> cubicEaseInOutTiming = CubicBezierTimingFunction::preset(CubicBezierTimingFunction::EaseInOut);
     EXPECT_EQ("ease-in-out", cubicEaseInOutTiming->toString());

     RefPtr<TimingFunction> cubicCustomTiming = CubicBezierTimingFunction::create(0.17, 0.67, 1, -1.73);
     EXPECT_EQ("cubic-bezier(0.17, 0.67, 1, -1.73)", cubicCustomTiming->toString());
 }

 TEST_F(TimingFunctionTest, StepToString)
 {
     RefPtr<TimingFunction> stepTimingStart = StepsTimingFunction::preset(StepsTimingFunction::Start);
     EXPECT_EQ("step-start", stepTimingStart->toString());

     RefPtr<TimingFunction> stepTimingMiddle = StepsTimingFunction::preset(StepsTimingFunction::Middle);
     EXPECT_EQ("step-middle", stepTimingMiddle->toString());

     RefPtr<TimingFunction> stepTimingEnd = StepsTimingFunction::preset(StepsTimingFunction::End);
     EXPECT_EQ("step-end", stepTimingEnd->toString());

     RefPtr<TimingFunction> stepTimingCustomStart = StepsTimingFunction::create(3, StepsTimingFunction::Start);
     EXPECT_EQ("steps(3, start)", stepTimingCustomStart->toString());

     RefPtr<TimingFunction> stepTimingCustomMiddle = StepsTimingFunction::create(4, StepsTimingFunction::Middle);
     EXPECT_EQ("steps(4, middle)", stepTimingCustomMiddle->toString());

     RefPtr<TimingFunction> stepTimingCustomEnd = StepsTimingFunction::create(5, StepsTimingFunction::End);
     EXPECT_EQ("steps(5, end)", stepTimingCustomEnd->toString());
 }

 TEST_F(TimingFunctionTest, BaseOperatorEq)
 {
     RefPtr<TimingFunction> linearTiming = LinearTimingFunction::shared();
     RefPtr<TimingFunction> cubicTiming1 = CubicBezierTimingFunction::preset(CubicBezierTimingFunction::EaseIn);
     RefPtr<TimingFunction> cubicTiming2 = CubicBezierTimingFunction::create(0.17, 0.67, 1, -1.73);
     RefPtr<TimingFunction> stepsTiming1 = StepsTimingFunction::preset(StepsTimingFunction::End);
     RefPtr<TimingFunction> stepsTiming2 = StepsTimingFunction::create(5, StepsTimingFunction::Start);

     Vector<std::pair<std::string, RefPtr<TimingFunction> > > v;
     v.append(std::make_pair("linearTiming", linearTiming));
     v.append(std::make_pair("cubicTiming1", cubicTiming1));
     v.append(std::make_pair("cubicTiming2", cubicTiming2));
     v.append(std::make_pair("stepsTiming1", stepsTiming1));
     v.append(std::make_pair("stepsTiming2", stepsTiming2));
     notEqualHelperLoop(v);
 }

 TEST_F(TimingFunctionTest, LinearOperatorEq)
 {
     RefPtr<TimingFunction> linearTiming1 = LinearTimingFunction::shared();
     RefPtr<TimingFunction> linearTiming2 = LinearTimingFunction::shared();
     EXPECT_EQ(*linearTiming1, *linearTiming1);
     EXPECT_EQ(*linearTiming1, *linearTiming2);
 }

 TEST_F(TimingFunctionTest, CubicOperatorEq)
 {
     RefPtr<TimingFunction> cubicEaseInTiming1 = CubicBezierTimingFunction::preset(CubicBezierTimingFunction::EaseIn);
     RefPtr<TimingFunction> cubicEaseInTiming2 = CubicBezierTimingFunction::preset(CubicBezierTimingFunction::EaseIn);
     EXPECT_EQ(*cubicEaseInTiming1, *cubicEaseInTiming1);
     EXPECT_EQ(*cubicEaseInTiming1, *cubicEaseInTiming2);

     RefPtr<TimingFunction> cubicEaseOutTiming1 = CubicBezierTimingFunction::preset(CubicBezierTimingFunction::EaseOut);
     RefPtr<TimingFunction> cubicEaseOutTiming2 = CubicBezierTimingFunction::preset(CubicBezierTimingFunction::EaseOut);
     EXPECT_EQ(*cubicEaseOutTiming1, *cubicEaseOutTiming1);
     EXPECT_EQ(*cubicEaseOutTiming1, *cubicEaseOutTiming2);

     RefPtr<TimingFunction> cubicEaseInOutTiming1 = CubicBezierTimingFunction::preset(CubicBezierTimingFunction::EaseInOut);
     RefPtr<TimingFunction> cubicEaseInOutTiming2 = CubicBezierTimingFunction::preset(CubicBezierTimingFunction::EaseInOut);
     EXPECT_EQ(*cubicEaseInOutTiming1, *cubicEaseInOutTiming1);
     EXPECT_EQ(*cubicEaseInOutTiming1, *cubicEaseInOutTiming2);

     RefPtr<TimingFunction> cubicCustomTiming1 = CubicBezierTimingFunction::create(0.17, 0.67, 1, -1.73);
     RefPtr<TimingFunction> cubicCustomTiming2 = CubicBezierTimingFunction::create(0.17, 0.67, 1, -1.73);
     EXPECT_EQ(*cubicCustomTiming1, *cubicCustomTiming1);
     EXPECT_EQ(*cubicCustomTiming1, *cubicCustomTiming2);

     Vector<std::pair<std::string, RefPtr<TimingFunction> > > v;
     v.append(std::make_pair("cubicEaseInTiming1", cubicEaseInTiming1));
     v.append(std::make_pair("cubicEaseOutTiming1", cubicEaseOutTiming1));
     v.append(std::make_pair("cubicEaseInOutTiming1", cubicEaseInOutTiming1));
     v.append(std::make_pair("cubicCustomTiming1", cubicCustomTiming1));
     notEqualHelperLoop(v);
 }

 TEST_F(TimingFunctionTest, CubicOperatorEqReflectivity)
 {
     RefPtr<TimingFunction> cubicA = CubicBezierTimingFunction::preset(CubicBezierTimingFunction::EaseIn);
     RefPtr<TimingFunction> cubicB = CubicBezierTimingFunction::create(0.42, 0.0, 1.0, 1.0);
     EXPECT_NE(*cubicA, *cubicB);
     EXPECT_NE(*cubicB, *cubicA);
 }

 TEST_F(TimingFunctionTest, StepsOperatorEq)
 {
     RefPtr<TimingFunction> stepsTimingStart1 = StepsTimingFunction::preset(StepsTimingFunction::Start);
     RefPtr<TimingFunction> stepsTimingStart2 = StepsTimingFunction::preset(StepsTimingFunction::Start);
     EXPECT_EQ(*stepsTimingStart1, *stepsTimingStart1);
     EXPECT_EQ(*stepsTimingStart1, *stepsTimingStart2);

     RefPtr<TimingFunction> stepsTimingEnd1 = StepsTimingFunction::preset(StepsTimingFunction::End);
     RefPtr<TimingFunction> stepsTimingEnd2 = StepsTimingFunction::preset(StepsTimingFunction::End);
     EXPECT_EQ(*stepsTimingEnd1, *stepsTimingEnd1);
     EXPECT_EQ(*stepsTimingEnd1, *stepsTimingEnd2);

     RefPtr<TimingFunction> stepsTimingCustom1 = StepsTimingFunction::create(5, StepsTimingFunction::Start);
     RefPtr<TimingFunction> stepsTimingCustom2 = StepsTimingFunction::create(5, StepsTimingFunction::End);
     RefPtr<TimingFunction> stepsTimingCustom3 = StepsTimingFunction::create(7, StepsTimingFunction::Start);
     RefPtr<TimingFunction> stepsTimingCustom4 = StepsTimingFunction::create(7, StepsTimingFunction::End);

     EXPECT_EQ(*StepsTimingFunction::create(5, StepsTimingFunction::Start), *stepsTimingCustom1);
     EXPECT_EQ(*StepsTimingFunction::create(5, StepsTimingFunction::End), *stepsTimingCustom2);
     EXPECT_EQ(*StepsTimingFunction::create(7, StepsTimingFunction::Start), *stepsTimingCustom3);
     EXPECT_EQ(*StepsTimingFunction::create(7, StepsTimingFunction::End), *stepsTimingCustom4);

     Vector<std::pair<std::string, RefPtr<TimingFunction> > > v;
     v.append(std::make_pair("stepsTimingStart1", stepsTimingStart1));
     v.append(std::make_pair("stepsTimingEnd1", stepsTimingEnd1));
     v.append(std::make_pair("stepsTimingCustom1", stepsTimingCustom1));
     v.append(std::make_pair("stepsTimingCustom2", stepsTimingCustom2));
     v.append(std::make_pair("stepsTimingCustom3", stepsTimingCustom3));
     v.append(std::make_pair("stepsTimingCustom4", stepsTimingCustom4));
     notEqualHelperLoop(v);
 }

 TEST_F(TimingFunctionTest, StepsOperatorEqPreset)
 {
     RefPtr<TimingFunction> stepsA = StepsTimingFunction::preset(StepsTimingFunction::Start);
     RefPtr<TimingFunction> stepsB = StepsTimingFunction::create(1, StepsTimingFunction::Start);
     EXPECT_EQ(*stepsA, *stepsB);
     EXPECT_EQ(*stepsB, *stepsA);
 }

 TEST_F(TimingFunctionTest, LinearEvaluate)
 {
     RefPtr<TimingFunction> linearTiming = LinearTimingFunction::shared();
     EXPECT_EQ(0.2, linearTiming->evaluate(0.2, 0));
     EXPECT_EQ(0.6, linearTiming->evaluate(0.6, 0));
     EXPECT_EQ(-0.2, linearTiming->evaluate(-0.2, 0));
     EXPECT_EQ(1.6, linearTiming->evaluate(1.6, 0));
 }

 TEST_F(TimingFunctionTest, LinearRange)
 {
     double start = 0;
     double end = 1;
     RefPtr<TimingFunction> linearTiming = LinearTimingFunction::shared();
     linearTiming->range(&start, &end);
     EXPECT_NEAR(0, start, 0.01);
     EXPECT_NEAR(1, end, 0.01);
     start = -1;
     end = 10;
     linearTiming->range(&start, &end);
     EXPECT_NEAR(-1, start, 0.01);
     EXPECT_NEAR(10, end, 0.01);
 }

 TEST_F(TimingFunctionTest, StepRange)
 {
     double start = 0;
     double end = 1;
     RefPtr<TimingFunction> steps = StepsTimingFunction::preset(StepsTimingFunction::Start);
     steps->range(&start, &end);
     EXPECT_NEAR(0, start, 0.01);
     EXPECT_NEAR(1, end, 0.01);

     start = -1;
     end = 10;
     steps->range(&start, &end);
     EXPECT_NEAR(0, start, 0.01);
     EXPECT_NEAR(1, end, 0.01);
 }

 TEST_F(TimingFunctionTest, CubicRange)
 {
     double start = 0;
     double end = 1;

     RefPtr<TimingFunction> cubicEaseTiming = CubicBezierTimingFunction::preset(CubicBezierTimingFunction::Ease);
     start = 0;
     end = 1;
     cubicEaseTiming->range(&start, &end);
     EXPECT_NEAR(0, start, 0.01);
     EXPECT_NEAR(1, end, 0.01);
     start = -1;
     end = 10;
     cubicEaseTiming->range(&start, &end);
     EXPECT_NEAR(-0.4, start, 0.01);
     EXPECT_NEAR(1, end, 0.01);

     RefPtr<TimingFunction> cubicEaseInTiming = CubicBezierTimingFunction::preset(CubicBezierTimingFunction::EaseIn);
     start = 0;
     end = 1;
     cubicEaseInTiming->range(&start, &end);
     EXPECT_NEAR(0, start, 0.01);
     EXPECT_NEAR(1, end, 0.01);
     start = -1;
     end = 10;
     cubicEaseInTiming->range(&start, &end);
     EXPECT_NEAR(0.0, start, 0.01);
     EXPECT_NEAR(16.51, end, 0.01);

     RefPtr<TimingFunction> cubicEaseOutTiming = CubicBezierTimingFunction::preset(CubicBezierTimingFunction::EaseOut);
     start = 0;
     end = 1;
     cubicEaseOutTiming->range(&start, &end);
     EXPECT_NEAR(0, start, 0.01);
     EXPECT_NEAR(1, end, 0.01);
     start = -1;
     end = 10;
     cubicEaseOutTiming->range(&start, &end);
     EXPECT_NEAR(-1.72, start, 0.01);
     EXPECT_NEAR(1.0, end, 0.01);

     RefPtr<TimingFunction> cubicEaseInOutTiming = CubicBezierTimingFunction::preset(CubicBezierTimingFunction::EaseInOut);
     start = 0;
     end = 1;
     cubicEaseInOutTiming->range(&start, &end);
     EXPECT_NEAR(0, start, 0.01);
     EXPECT_NEAR(1, end, 0.01);
     start = -1;
     end = 10;
     cubicEaseInOutTiming->range(&start, &end);
     EXPECT_NEAR(0.0, start, 0.01);
     EXPECT_NEAR(1.0, end, 0.01);

     RefPtr<TimingFunction> cubicCustomTiming = CubicBezierTimingFunction::create(0.17, 0.67, 1.0, -1.73);
     start = 0;
     end = 1;
     cubicCustomTiming->range(&start, &end);
     EXPECT_NEAR(-0.33, start, 0.01);
     EXPECT_NEAR(1.0, end, 0.01);

     start = -1;
     end = 10;
     cubicCustomTiming->range(&start, &end);
     EXPECT_NEAR(-3.94, start, 0.01);
     EXPECT_NEAR(4.578, end, 0.01);
 }

 TEST_F(TimingFunctionTest, CubicEvaluate)
 {
     double tolerance = 0.01;
     RefPtr<TimingFunction> cubicEaseTiming = CubicBezierTimingFunction::preset(CubicBezierTimingFunction::Ease);
     EXPECT_NEAR(0.418, cubicEaseTiming->evaluate(0.25, tolerance), tolerance);
     EXPECT_NEAR(0.805, cubicEaseTiming->evaluate(0.50, tolerance), tolerance);
     EXPECT_NEAR(0.960, cubicEaseTiming->evaluate(0.75, tolerance), tolerance);

     RefPtr<TimingFunction> cubicEaseInTiming = CubicBezierTimingFunction::preset(CubicBezierTimingFunction::EaseIn);
     EXPECT_NEAR(0.093, cubicEaseInTiming->evaluate(0.25, tolerance), tolerance);
     EXPECT_NEAR(0.305, cubicEaseInTiming->evaluate(0.50, tolerance), tolerance);
     EXPECT_NEAR(0.620, cubicEaseInTiming->evaluate(0.75, tolerance), tolerance);

     RefPtr<TimingFunction> cubicEaseOutTiming = CubicBezierTimingFunction::preset(CubicBezierTimingFunction::EaseOut);
     EXPECT_NEAR(0.379, cubicEaseOutTiming->evaluate(0.25, tolerance), tolerance);
     EXPECT_NEAR(0.694, cubicEaseOutTiming->evaluate(0.50, tolerance), tolerance);
     EXPECT_NEAR(0.906, cubicEaseOutTiming->evaluate(0.75, tolerance), tolerance);

     RefPtr<TimingFunction> cubicEaseInOutTiming = CubicBezierTimingFunction::preset(CubicBezierTimingFunction::EaseInOut);
     EXPECT_NEAR(0.128, cubicEaseInOutTiming->evaluate(0.25, tolerance), tolerance);
     EXPECT_NEAR(0.500, cubicEaseInOutTiming->evaluate(0.50, tolerance), tolerance);
     EXPECT_NEAR(0.871, cubicEaseInOutTiming->evaluate(0.75, tolerance), tolerance);

     RefPtr<TimingFunction> cubicCustomTiming = CubicBezierTimingFunction::create(0.17, 0.67, 1, -1.73);
     EXPECT_NEAR(0.034, cubicCustomTiming->evaluate(0.25, tolerance), tolerance);
     EXPECT_NEAR(-0.217, cubicCustomTiming->evaluate(0.50, tolerance), tolerance);
     EXPECT_NEAR(-0.335, cubicCustomTiming->evaluate(0.75, tolerance), tolerance);
 }

 TEST_F(TimingFunctionTest, StepsEvaluate)
 {
     RefPtr<TimingFunction> stepsTimingStart = StepsTimingFunction::preset(StepsTimingFunction::Start);
     EXPECT_EQ(0.00, stepsTimingStart->evaluate(-1.10, 0));
     EXPECT_EQ(0.00, stepsTimingStart->evaluate(-0.10, 0));
     EXPECT_EQ(1.00, stepsTimingStart->evaluate(0.00, 0));
     EXPECT_EQ(1.00, stepsTimingStart->evaluate(0.20, 0));
     EXPECT_EQ(1.00, stepsTimingStart->evaluate(0.60, 0));
     EXPECT_EQ(1.00, stepsTimingStart->evaluate(1.00, 0));
     EXPECT_EQ(1.00, stepsTimingStart->evaluate(2.00, 0));

     RefPtr<TimingFunction> stepsTimingMiddle = StepsTimingFunction::preset(StepsTimingFunction::Middle);
     EXPECT_EQ(0.00, stepsTimingMiddle->evaluate(-2.50, 0));
     EXPECT_EQ(0.00, stepsTimingMiddle->evaluate(0.00, 0));
     EXPECT_EQ(0.00, stepsTimingMiddle->evaluate(0.49, 0));
     EXPECT_EQ(1.00, stepsTimingMiddle->evaluate(0.50, 0));
     EXPECT_EQ(1.00, stepsTimingMiddle->evaluate(1.00, 0));
     EXPECT_EQ(1.00, stepsTimingMiddle->evaluate(2.50, 0));

     RefPtr<TimingFunction> stepsTimingEnd = StepsTimingFunction::preset(StepsTimingFunction::End);
     EXPECT_EQ(0.00, stepsTimingEnd->evaluate(-2.00, 0));
     EXPECT_EQ(0.00, stepsTimingEnd->evaluate(0.00, 0));
     EXPECT_EQ(0.00, stepsTimingEnd->evaluate(0.20, 0));
     EXPECT_EQ(0.00, stepsTimingEnd->evaluate(0.60, 0));
     EXPECT_EQ(1.00, stepsTimingEnd->evaluate(1.00, 0));
     EXPECT_EQ(1.00, stepsTimingEnd->evaluate(2.00, 0));

     RefPtr<TimingFunction> stepsTimingCustomStart = StepsTimingFunction::create(4, StepsTimingFunction::Start);
     EXPECT_EQ(0.00, stepsTimingCustomStart->evaluate(-0.50, 0));
     EXPECT_EQ(0.25, stepsTimingCustomStart->evaluate(0.00, 0));
     EXPECT_EQ(0.25, stepsTimingCustomStart->evaluate(0.24, 0));
     EXPECT_EQ(0.50, stepsTimingCustomStart->evaluate(0.25, 0));
     EXPECT_EQ(0.50, stepsTimingCustomStart->evaluate(0.49, 0));
     EXPECT_EQ(0.75, stepsTimingCustomStart->evaluate(0.50, 0));
     EXPECT_EQ(0.75, stepsTimingCustomStart->evaluate(0.74, 0));
     EXPECT_EQ(1.00, stepsTimingCustomStart->evaluate(0.75, 0));
     EXPECT_EQ(1.00, stepsTimingCustomStart->evaluate(1.00, 0));
     EXPECT_EQ(1.00, stepsTimingCustomStart->evaluate(1.50, 0));

     RefPtr<TimingFunction> stepsTimingCustomMiddle = StepsTimingFunction::create(4, StepsTimingFunction::Middle);
     EXPECT_EQ(0.00, stepsTimingCustomMiddle->evaluate(-2.00, 0));
     EXPECT_EQ(0.00, stepsTimingCustomMiddle->evaluate(0.00, 0));
     EXPECT_EQ(0.00, stepsTimingCustomMiddle->evaluate(0.12, 0));
     EXPECT_EQ(0.25, stepsTimingCustomMiddle->evaluate(0.13, 0));
     EXPECT_EQ(0.25, stepsTimingCustomMiddle->evaluate(0.37, 0));
     EXPECT_EQ(0.50, stepsTimingCustomMiddle->evaluate(0.38, 0));
     EXPECT_EQ(0.50, stepsTimingCustomMiddle->evaluate(0.62, 0));
     EXPECT_EQ(0.75, stepsTimingCustomMiddle->evaluate(0.63, 0));
     EXPECT_EQ(0.75, stepsTimingCustomMiddle->evaluate(0.87, 0));
     EXPECT_EQ(1.00, stepsTimingCustomMiddle->evaluate(0.88, 0));
     EXPECT_EQ(1.00, stepsTimingCustomMiddle->evaluate(1.00, 0));
     EXPECT_EQ(1.00, stepsTimingCustomMiddle->evaluate(3.00, 0));

     RefPtr<TimingFunction> stepsTimingCustomEnd = StepsTimingFunction::create(4, StepsTimingFunction::End);
     EXPECT_EQ(0.00, stepsTimingCustomEnd->evaluate(-2.00, 0));
     EXPECT_EQ(0.00, stepsTimingCustomEnd->evaluate(0.00, 0));
     EXPECT_EQ(0.00, stepsTimingCustomEnd->evaluate(0.24, 0));
     EXPECT_EQ(0.25, stepsTimingCustomEnd->evaluate(0.25, 0));
     EXPECT_EQ(0.25, stepsTimingCustomEnd->evaluate(0.49, 0));
     EXPECT_EQ(0.50, stepsTimingCustomEnd->evaluate(0.50, 0));
     EXPECT_EQ(0.50, stepsTimingCustomEnd->evaluate(0.74, 0));
     EXPECT_EQ(0.75, stepsTimingCustomEnd->evaluate(0.75, 0));
     EXPECT_EQ(0.75, stepsTimingCustomEnd->evaluate(0.99, 0));
     EXPECT_EQ(1.00, stepsTimingCustomEnd->evaluate(1.00, 0));
     EXPECT_EQ(1.00, stepsTimingCustomEnd->evaluate(2.00, 0));
 }

 } // namespace

 } // namespace blink
	/*
	* Copyright (c) 2013, Google 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:
	*
	* * Redistributions of source code must retain the above copyright
	* notice, this list of conditions and the following disclaimer.
	* * 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.
	* * Neither the name of Google Inc. nor the names of its
	* contributors may be used to endorse or promote products derived from
	* this software without specific prior written permission.
	*
	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
	* OWNER OR 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 "platform/animation/TimingFunction.h"

	#include "wtf/text/WTFString.h"
	#include <gmock/gmock.h>
	#include <gtest/gtest.h>
	#include <sstream>
	#include <string>

	// Macro is only used to allow the use of streams.
	// Can be removed if a pretty failure message isn't needed.
	#define EXPECT_NE_WITH_MESSAGE(a, b) \
	EXPECT_NE(a.second, b.second) \
	<< a.first \
	<< " (" << a.second->toString().latin1().data() << ")" \
	<< " == " \
	<< b.first \
	<< " (" << b.second->toString().latin1().data() << ")" \
	<< "\n";

	namespace blink {

	namespace {

	class TimingFunctionTest : public ::testing::Test {
	public:
	void notEqualHelperLoop(Vector<std::pair<std::string, RefPtr<TimingFunction> > >& v)
	{
	for (size_t i = 0; i < v.size(); ++i) {
	for (size_t j = 0; j < v.size(); ++j) {
	if (i == j)
	continue;
	EXPECT_NE_WITH_MESSAGE(v[i], v[j]);
	}
	}
	}
	};

	TEST_F(TimingFunctionTest, LinearToString)
	{
	RefPtr<TimingFunction> linearTiming = LinearTimingFunction::shared();
	EXPECT_EQ(linearTiming->toString(), "linear");
	}

	TEST_F(TimingFunctionTest, CubicToString)
	{
	RefPtr<TimingFunction> cubicEaseTiming = CubicBezierTimingFunction::preset(CubicBezierTimingFunction::Ease);
	EXPECT_EQ("ease", cubicEaseTiming->toString());
	RefPtr<TimingFunction> cubicEaseInTiming = CubicBezierTimingFunction::preset(CubicBezierTimingFunction::EaseIn);
	EXPECT_EQ("ease-in", cubicEaseInTiming->toString());
	RefPtr<TimingFunction> cubicEaseOutTiming = CubicBezierTimingFunction::preset(CubicBezierTimingFunction::EaseOut);
	EXPECT_EQ("ease-out", cubicEaseOutTiming->toString());
	RefPtr<TimingFunction> cubicEaseInOutTiming = CubicBezierTimingFunction::preset(CubicBezierTimingFunction::EaseInOut);
	EXPECT_EQ("ease-in-out", cubicEaseInOutTiming->toString());

	RefPtr<TimingFunction> cubicCustomTiming = CubicBezierTimingFunction::create(0.17, 0.67, 1, -1.73);
	EXPECT_EQ("cubic-bezier(0.17, 0.67, 1, -1.73)", cubicCustomTiming->toString());
	}

	TEST_F(TimingFunctionTest, StepToString)
	{
	RefPtr<TimingFunction> stepTimingStart = StepsTimingFunction::preset(StepsTimingFunction::Start);
	EXPECT_EQ("step-start", stepTimingStart->toString());

	RefPtr<TimingFunction> stepTimingMiddle = StepsTimingFunction::preset(StepsTimingFunction::Middle);
	EXPECT_EQ("step-middle", stepTimingMiddle->toString());

	RefPtr<TimingFunction> stepTimingEnd = StepsTimingFunction::preset(StepsTimingFunction::End);
	EXPECT_EQ("step-end", stepTimingEnd->toString());

	RefPtr<TimingFunction> stepTimingCustomStart = StepsTimingFunction::create(3, StepsTimingFunction::Start);
	EXPECT_EQ("steps(3, start)", stepTimingCustomStart->toString());

	RefPtr<TimingFunction> stepTimingCustomMiddle = StepsTimingFunction::create(4, StepsTimingFunction::Middle);
	EXPECT_EQ("steps(4, middle)", stepTimingCustomMiddle->toString());

	RefPtr<TimingFunction> stepTimingCustomEnd = StepsTimingFunction::create(5, StepsTimingFunction::End);
	EXPECT_EQ("steps(5, end)", stepTimingCustomEnd->toString());
	}

	TEST_F(TimingFunctionTest, BaseOperatorEq)
	{
	RefPtr<TimingFunction> linearTiming = LinearTimingFunction::shared();
	RefPtr<TimingFunction> cubicTiming1 = CubicBezierTimingFunction::preset(CubicBezierTimingFunction::EaseIn);
	RefPtr<TimingFunction> cubicTiming2 = CubicBezierTimingFunction::create(0.17, 0.67, 1, -1.73);
	RefPtr<TimingFunction> stepsTiming1 = StepsTimingFunction::preset(StepsTimingFunction::End);
	RefPtr<TimingFunction> stepsTiming2 = StepsTimingFunction::create(5, StepsTimingFunction::Start);

	Vector<std::pair<std::string, RefPtr<TimingFunction> > > v;
	v.append(std::make_pair("linearTiming", linearTiming));
	v.append(std::make_pair("cubicTiming1", cubicTiming1));
	v.append(std::make_pair("cubicTiming2", cubicTiming2));
	v.append(std::make_pair("stepsTiming1", stepsTiming1));
	v.append(std::make_pair("stepsTiming2", stepsTiming2));
	notEqualHelperLoop(v);
	}

	TEST_F(TimingFunctionTest, LinearOperatorEq)
	{
	RefPtr<TimingFunction> linearTiming1 = LinearTimingFunction::shared();
	RefPtr<TimingFunction> linearTiming2 = LinearTimingFunction::shared();
	EXPECT_EQ(linearTiming1, linearTiming1);
	EXPECT_EQ(linearTiming1, linearTiming2);
	}

	TEST_F(TimingFunctionTest, CubicOperatorEq)
	{
	RefPtr<TimingFunction> cubicEaseInTiming1 = CubicBezierTimingFunction::preset(CubicBezierTimingFunction::EaseIn);
	RefPtr<TimingFunction> cubicEaseInTiming2 = CubicBezierTimingFunction::preset(CubicBezierTimingFunction::EaseIn);
	EXPECT_EQ(cubicEaseInTiming1, cubicEaseInTiming1);
	EXPECT_EQ(cubicEaseInTiming1, cubicEaseInTiming2);

	RefPtr<TimingFunction> cubicEaseOutTiming1 = CubicBezierTimingFunction::preset(CubicBezierTimingFunction::EaseOut);
	RefPtr<TimingFunction> cubicEaseOutTiming2 = CubicBezierTimingFunction::preset(CubicBezierTimingFunction::EaseOut);
	EXPECT_EQ(cubicEaseOutTiming1, cubicEaseOutTiming1);
	EXPECT_EQ(cubicEaseOutTiming1, cubicEaseOutTiming2);

	RefPtr<TimingFunction> cubicEaseInOutTiming1 = CubicBezierTimingFunction::preset(CubicBezierTimingFunction::EaseInOut);
	RefPtr<TimingFunction> cubicEaseInOutTiming2 = CubicBezierTimingFunction::preset(CubicBezierTimingFunction::EaseInOut);
	EXPECT_EQ(cubicEaseInOutTiming1, cubicEaseInOutTiming1);
	EXPECT_EQ(cubicEaseInOutTiming1, cubicEaseInOutTiming2);

	RefPtr<TimingFunction> cubicCustomTiming1 = CubicBezierTimingFunction::create(0.17, 0.67, 1, -1.73);
	RefPtr<TimingFunction> cubicCustomTiming2 = CubicBezierTimingFunction::create(0.17, 0.67, 1, -1.73);
	EXPECT_EQ(cubicCustomTiming1, cubicCustomTiming1);
	EXPECT_EQ(cubicCustomTiming1, cubicCustomTiming2);

	Vector<std::pair<std::string, RefPtr<TimingFunction> > > v;
	v.append(std::make_pair("cubicEaseInTiming1", cubicEaseInTiming1));
	v.append(std::make_pair("cubicEaseOutTiming1", cubicEaseOutTiming1));
	v.append(std::make_pair("cubicEaseInOutTiming1", cubicEaseInOutTiming1));
	v.append(std::make_pair("cubicCustomTiming1", cubicCustomTiming1));
	notEqualHelperLoop(v);
	}

	TEST_F(TimingFunctionTest, CubicOperatorEqReflectivity)
	{
	RefPtr<TimingFunction> cubicA = CubicBezierTimingFunction::preset(CubicBezierTimingFunction::EaseIn);
	RefPtr<TimingFunction> cubicB = CubicBezierTimingFunction::create(0.42, 0.0, 1.0, 1.0);
	EXPECT_NE(cubicA, cubicB);
	EXPECT_NE(cubicB, cubicA);
	}

	TEST_F(TimingFunctionTest, StepsOperatorEq)
	{
	RefPtr<TimingFunction> stepsTimingStart1 = StepsTimingFunction::preset(StepsTimingFunction::Start);
	RefPtr<TimingFunction> stepsTimingStart2 = StepsTimingFunction::preset(StepsTimingFunction::Start);
	EXPECT_EQ(stepsTimingStart1, stepsTimingStart1);
	EXPECT_EQ(stepsTimingStart1, stepsTimingStart2);

	RefPtr<TimingFunction> stepsTimingEnd1 = StepsTimingFunction::preset(StepsTimingFunction::End);
	RefPtr<TimingFunction> stepsTimingEnd2 = StepsTimingFunction::preset(StepsTimingFunction::End);
	EXPECT_EQ(stepsTimingEnd1, stepsTimingEnd1);
	EXPECT_EQ(stepsTimingEnd1, stepsTimingEnd2);

	RefPtr<TimingFunction> stepsTimingCustom1 = StepsTimingFunction::create(5, StepsTimingFunction::Start);
	RefPtr<TimingFunction> stepsTimingCustom2 = StepsTimingFunction::create(5, StepsTimingFunction::End);
	RefPtr<TimingFunction> stepsTimingCustom3 = StepsTimingFunction::create(7, StepsTimingFunction::Start);
	RefPtr<TimingFunction> stepsTimingCustom4 = StepsTimingFunction::create(7, StepsTimingFunction::End);

	EXPECT_EQ(StepsTimingFunction::create(5, StepsTimingFunction::Start), stepsTimingCustom1);
	EXPECT_EQ(StepsTimingFunction::create(5, StepsTimingFunction::End), stepsTimingCustom2);
	EXPECT_EQ(StepsTimingFunction::create(7, StepsTimingFunction::Start), stepsTimingCustom3);
	EXPECT_EQ(StepsTimingFunction::create(7, StepsTimingFunction::End), stepsTimingCustom4);

	Vector<std::pair<std::string, RefPtr<TimingFunction> > > v;
	v.append(std::make_pair("stepsTimingStart1", stepsTimingStart1));
	v.append(std::make_pair("stepsTimingEnd1", stepsTimingEnd1));
	v.append(std::make_pair("stepsTimingCustom1", stepsTimingCustom1));
	v.append(std::make_pair("stepsTimingCustom2", stepsTimingCustom2));
	v.append(std::make_pair("stepsTimingCustom3", stepsTimingCustom3));
	v.append(std::make_pair("stepsTimingCustom4", stepsTimingCustom4));
	notEqualHelperLoop(v);
	}

	TEST_F(TimingFunctionTest, StepsOperatorEqPreset)
	{
	RefPtr<TimingFunction> stepsA = StepsTimingFunction::preset(StepsTimingFunction::Start);
	RefPtr<TimingFunction> stepsB = StepsTimingFunction::create(1, StepsTimingFunction::Start);
	EXPECT_EQ(stepsA, stepsB);
	EXPECT_EQ(stepsB, stepsA);
	}

	TEST_F(TimingFunctionTest, LinearEvaluate)
	{
	RefPtr<TimingFunction> linearTiming = LinearTimingFunction::shared();
	EXPECT_EQ(0.2, linearTiming->evaluate(0.2, 0));
	EXPECT_EQ(0.6, linearTiming->evaluate(0.6, 0));
	EXPECT_EQ(-0.2, linearTiming->evaluate(-0.2, 0));
	EXPECT_EQ(1.6, linearTiming->evaluate(1.6, 0));
	}

	TEST_F(TimingFunctionTest, LinearRange)
	{
	double start = 0;
	double end = 1;
	RefPtr<TimingFunction> linearTiming = LinearTimingFunction::shared();
	linearTiming->range(&start, &end);
	EXPECT_NEAR(0, start, 0.01);
	EXPECT_NEAR(1, end, 0.01);
	start = -1;
	end = 10;
	linearTiming->range(&start, &end);
	EXPECT_NEAR(-1, start, 0.01);
	EXPECT_NEAR(10, end, 0.01);
	}

	TEST_F(TimingFunctionTest, StepRange)
	{
	double start = 0;
	double end = 1;
	RefPtr<TimingFunction> steps = StepsTimingFunction::preset(StepsTimingFunction::Start);
	steps->range(&start, &end);
	EXPECT_NEAR(0, start, 0.01);
	EXPECT_NEAR(1, end, 0.01);

	start = -1;
	end = 10;
	steps->range(&start, &end);
	EXPECT_NEAR(0, start, 0.01);
	EXPECT_NEAR(1, end, 0.01);
	}

	TEST_F(TimingFunctionTest, CubicRange)
	{
	double start = 0;
	double end = 1;

	RefPtr<TimingFunction> cubicEaseTiming = CubicBezierTimingFunction::preset(CubicBezierTimingFunction::Ease);
	start = 0;
	end = 1;
	cubicEaseTiming->range(&start, &end);
	EXPECT_NEAR(0, start, 0.01);
	EXPECT_NEAR(1, end, 0.01);
	start = -1;
	end = 10;
	cubicEaseTiming->range(&start, &end);
	EXPECT_NEAR(-0.4, start, 0.01);
	EXPECT_NEAR(1, end, 0.01);

	RefPtr<TimingFunction> cubicEaseInTiming = CubicBezierTimingFunction::preset(CubicBezierTimingFunction::EaseIn);
	start = 0;
	end = 1;
	cubicEaseInTiming->range(&start, &end);
	EXPECT_NEAR(0, start, 0.01);
	EXPECT_NEAR(1, end, 0.01);
	start = -1;
	end = 10;
	cubicEaseInTiming->range(&start, &end);
	EXPECT_NEAR(0.0, start, 0.01);
	EXPECT_NEAR(16.51, end, 0.01);

	RefPtr<TimingFunction> cubicEaseOutTiming = CubicBezierTimingFunction::preset(CubicBezierTimingFunction::EaseOut);
	start = 0;
	end = 1;
	cubicEaseOutTiming->range(&start, &end);
	EXPECT_NEAR(0, start, 0.01);
	EXPECT_NEAR(1, end, 0.01);
	start = -1;
	end = 10;
	cubicEaseOutTiming->range(&start, &end);
	EXPECT_NEAR(-1.72, start, 0.01);
	EXPECT_NEAR(1.0, end, 0.01);

	RefPtr<TimingFunction> cubicEaseInOutTiming = CubicBezierTimingFunction::preset(CubicBezierTimingFunction::EaseInOut);
	start = 0;
	end = 1;
	cubicEaseInOutTiming->range(&start, &end);
	EXPECT_NEAR(0, start, 0.01);
	EXPECT_NEAR(1, end, 0.01);
	start = -1;
	end = 10;
	cubicEaseInOutTiming->range(&start, &end);
	EXPECT_NEAR(0.0, start, 0.01);
	EXPECT_NEAR(1.0, end, 0.01);

	RefPtr<TimingFunction> cubicCustomTiming = CubicBezierTimingFunction::create(0.17, 0.67, 1.0, -1.73);
	start = 0;
	end = 1;
	cubicCustomTiming->range(&start, &end);
	EXPECT_NEAR(-0.33, start, 0.01);
	EXPECT_NEAR(1.0, end, 0.01);

	start = -1;
	end = 10;
	cubicCustomTiming->range(&start, &end);
	EXPECT_NEAR(-3.94, start, 0.01);
	EXPECT_NEAR(4.578, end, 0.01);
	}

	TEST_F(TimingFunctionTest, CubicEvaluate)
	{
	double tolerance = 0.01;
	RefPtr<TimingFunction> cubicEaseTiming = CubicBezierTimingFunction::preset(CubicBezierTimingFunction::Ease);
	EXPECT_NEAR(0.418, cubicEaseTiming->evaluate(0.25, tolerance), tolerance);
	EXPECT_NEAR(0.805, cubicEaseTiming->evaluate(0.50, tolerance), tolerance);
	EXPECT_NEAR(0.960, cubicEaseTiming->evaluate(0.75, tolerance), tolerance);

	RefPtr<TimingFunction> cubicEaseInTiming = CubicBezierTimingFunction::preset(CubicBezierTimingFunction::EaseIn);
	EXPECT_NEAR(0.093, cubicEaseInTiming->evaluate(0.25, tolerance), tolerance);
	EXPECT_NEAR(0.305, cubicEaseInTiming->evaluate(0.50, tolerance), tolerance);
	EXPECT_NEAR(0.620, cubicEaseInTiming->evaluate(0.75, tolerance), tolerance);

	RefPtr<TimingFunction> cubicEaseOutTiming = CubicBezierTimingFunction::preset(CubicBezierTimingFunction::EaseOut);
	EXPECT_NEAR(0.379, cubicEaseOutTiming->evaluate(0.25, tolerance), tolerance);
	EXPECT_NEAR(0.694, cubicEaseOutTiming->evaluate(0.50, tolerance), tolerance);
	EXPECT_NEAR(0.906, cubicEaseOutTiming->evaluate(0.75, tolerance), tolerance);

	RefPtr<TimingFunction> cubicEaseInOutTiming = CubicBezierTimingFunction::preset(CubicBezierTimingFunction::EaseInOut);
	EXPECT_NEAR(0.128, cubicEaseInOutTiming->evaluate(0.25, tolerance), tolerance);
	EXPECT_NEAR(0.500, cubicEaseInOutTiming->evaluate(0.50, tolerance), tolerance);
	EXPECT_NEAR(0.871, cubicEaseInOutTiming->evaluate(0.75, tolerance), tolerance);

	RefPtr<TimingFunction> cubicCustomTiming = CubicBezierTimingFunction::create(0.17, 0.67, 1, -1.73);
	EXPECT_NEAR(0.034, cubicCustomTiming->evaluate(0.25, tolerance), tolerance);
	EXPECT_NEAR(-0.217, cubicCustomTiming->evaluate(0.50, tolerance), tolerance);
	EXPECT_NEAR(-0.335, cubicCustomTiming->evaluate(0.75, tolerance), tolerance);
	}

	TEST_F(TimingFunctionTest, StepsEvaluate)
	{
	RefPtr<TimingFunction> stepsTimingStart = StepsTimingFunction::preset(StepsTimingFunction::Start);
	EXPECT_EQ(0.00, stepsTimingStart->evaluate(-1.10, 0));
	EXPECT_EQ(0.00, stepsTimingStart->evaluate(-0.10, 0));
	EXPECT_EQ(1.00, stepsTimingStart->evaluate(0.00, 0));
	EXPECT_EQ(1.00, stepsTimingStart->evaluate(0.20, 0));
	EXPECT_EQ(1.00, stepsTimingStart->evaluate(0.60, 0));
	EXPECT_EQ(1.00, stepsTimingStart->evaluate(1.00, 0));
	EXPECT_EQ(1.00, stepsTimingStart->evaluate(2.00, 0));

	RefPtr<TimingFunction> stepsTimingMiddle = StepsTimingFunction::preset(StepsTimingFunction::Middle);
	EXPECT_EQ(0.00, stepsTimingMiddle->evaluate(-2.50, 0));
	EXPECT_EQ(0.00, stepsTimingMiddle->evaluate(0.00, 0));
	EXPECT_EQ(0.00, stepsTimingMiddle->evaluate(0.49, 0));
	EXPECT_EQ(1.00, stepsTimingMiddle->evaluate(0.50, 0));
	EXPECT_EQ(1.00, stepsTimingMiddle->evaluate(1.00, 0));
	EXPECT_EQ(1.00, stepsTimingMiddle->evaluate(2.50, 0));

	RefPtr<TimingFunction> stepsTimingEnd = StepsTimingFunction::preset(StepsTimingFunction::End);
	EXPECT_EQ(0.00, stepsTimingEnd->evaluate(-2.00, 0));
	EXPECT_EQ(0.00, stepsTimingEnd->evaluate(0.00, 0));
	EXPECT_EQ(0.00, stepsTimingEnd->evaluate(0.20, 0));
	EXPECT_EQ(0.00, stepsTimingEnd->evaluate(0.60, 0));
	EXPECT_EQ(1.00, stepsTimingEnd->evaluate(1.00, 0));
	EXPECT_EQ(1.00, stepsTimingEnd->evaluate(2.00, 0));

	RefPtr<TimingFunction> stepsTimingCustomStart = StepsTimingFunction::create(4, StepsTimingFunction::Start);
	EXPECT_EQ(0.00, stepsTimingCustomStart->evaluate(-0.50, 0));
	EXPECT_EQ(0.25, stepsTimingCustomStart->evaluate(0.00, 0));
	EXPECT_EQ(0.25, stepsTimingCustomStart->evaluate(0.24, 0));
	EXPECT_EQ(0.50, stepsTimingCustomStart->evaluate(0.25, 0));
	EXPECT_EQ(0.50, stepsTimingCustomStart->evaluate(0.49, 0));
	EXPECT_EQ(0.75, stepsTimingCustomStart->evaluate(0.50, 0));
	EXPECT_EQ(0.75, stepsTimingCustomStart->evaluate(0.74, 0));
	EXPECT_EQ(1.00, stepsTimingCustomStart->evaluate(0.75, 0));
	EXPECT_EQ(1.00, stepsTimingCustomStart->evaluate(1.00, 0));
	EXPECT_EQ(1.00, stepsTimingCustomStart->evaluate(1.50, 0));

	RefPtr<TimingFunction> stepsTimingCustomMiddle = StepsTimingFunction::create(4, StepsTimingFunction::Middle);
	EXPECT_EQ(0.00, stepsTimingCustomMiddle->evaluate(-2.00, 0));
	EXPECT_EQ(0.00, stepsTimingCustomMiddle->evaluate(0.00, 0));
	EXPECT_EQ(0.00, stepsTimingCustomMiddle->evaluate(0.12, 0));
	EXPECT_EQ(0.25, stepsTimingCustomMiddle->evaluate(0.13, 0));
	EXPECT_EQ(0.25, stepsTimingCustomMiddle->evaluate(0.37, 0));
	EXPECT_EQ(0.50, stepsTimingCustomMiddle->evaluate(0.38, 0));
	EXPECT_EQ(0.50, stepsTimingCustomMiddle->evaluate(0.62, 0));
	EXPECT_EQ(0.75, stepsTimingCustomMiddle->evaluate(0.63, 0));
	EXPECT_EQ(0.75, stepsTimingCustomMiddle->evaluate(0.87, 0));
	EXPECT_EQ(1.00, stepsTimingCustomMiddle->evaluate(0.88, 0));
	EXPECT_EQ(1.00, stepsTimingCustomMiddle->evaluate(1.00, 0));
	EXPECT_EQ(1.00, stepsTimingCustomMiddle->evaluate(3.00, 0));

	RefPtr<TimingFunction> stepsTimingCustomEnd = StepsTimingFunction::create(4, StepsTimingFunction::End);
	EXPECT_EQ(0.00, stepsTimingCustomEnd->evaluate(-2.00, 0));
	EXPECT_EQ(0.00, stepsTimingCustomEnd->evaluate(0.00, 0));
	EXPECT_EQ(0.00, stepsTimingCustomEnd->evaluate(0.24, 0));
	EXPECT_EQ(0.25, stepsTimingCustomEnd->evaluate(0.25, 0));
	EXPECT_EQ(0.25, stepsTimingCustomEnd->evaluate(0.49, 0));
	EXPECT_EQ(0.50, stepsTimingCustomEnd->evaluate(0.50, 0));
	EXPECT_EQ(0.50, stepsTimingCustomEnd->evaluate(0.74, 0));
	EXPECT_EQ(0.75, stepsTimingCustomEnd->evaluate(0.75, 0));
	EXPECT_EQ(0.75, stepsTimingCustomEnd->evaluate(0.99, 0));
	EXPECT_EQ(1.00, stepsTimingCustomEnd->evaluate(1.00, 0));
	EXPECT_EQ(1.00, stepsTimingCustomEnd->evaluate(2.00, 0));
	}

	} // namespace

	} // namespace blink