sky/engine/platform/animation/UnitBezierTest.cpp

/*
 * 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
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 *
 * 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 BE LIABLE FOR ANY
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#include "sky/engine/platform/animation/UnitBezier.h"

#include <gtest/gtest.h>

using namespace blink;

namespace {

TEST(UnitBezierTest, BasicUse)
{
    UnitBezier bezier(0.5, 1.0, 0.5, 1.0);
    EXPECT_EQ(0.875, bezier.solve(0.5, 0.005));
}

TEST(UnitBezierTest, Overshoot)
{
    UnitBezier bezier(0.5, 2.0, 0.5, 2.0);
    EXPECT_EQ(1.625, bezier.solve(0.5, 0.005));
}

TEST(UnitBezierTest, Undershoot)
{
    UnitBezier bezier(0.5, -1.0, 0.5, -1.0);
    EXPECT_EQ(-0.625, bezier.solve(0.5, 0.005));
}

TEST(UnitBezierTest, InputAtEdgeOfRange)
{
    UnitBezier bezier(0.5, 1.0, 0.5, 1.0);
    EXPECT_EQ(0.0, bezier.solve(0.0, 0.005));
    EXPECT_EQ(1.0, bezier.solve(1.0, 0.005));
}

TEST(UnitBezierTest, InputOutOfRange)
{
    UnitBezier bezier(0.5, 1.0, 0.5, 1.0);
    EXPECT_EQ(-2.0, bezier.solve(-1.0, 0.005));
    EXPECT_EQ(1.0, bezier.solve(2.0, 0.005));
}

TEST(UnitBezierTest, InputOutOfRangeLargeEpsilon)
{
    UnitBezier bezier(0.5, 1.0, 0.5, 1.0);
    EXPECT_EQ(-2.0, bezier.solve(-1.0, 1.0));
    EXPECT_EQ(1.0, bezier.solve(2.0, 1.0));
}

TEST(UnitBezierTest, InputOutOfRangeCoincidentEndpoints)
{
    UnitBezier bezier(0.0, 0.0, 1.0, 1.0);
    EXPECT_EQ(-1.0, bezier.solve(-1.0, 0.005));
    EXPECT_EQ(2.0, bezier.solve(2.0, 0.005));
}

TEST(UnitBezierTest, InputOutOfRangeVerticalGradient)
{
    UnitBezier bezier(0.0, 1.0, 1.0, 0.0);
    EXPECT_EQ(0.0, bezier.solve(-1.0, 0.005));
    EXPECT_EQ(1.0, bezier.solve(2.0, 0.005));
}

TEST(UnitBezierTest, InputOutOfRangeDistinctEndpoints)
{
    UnitBezier bezier(0.1, 0.2, 0.8, 0.8);
    EXPECT_EQ(-2.0, bezier.solve(-1.0, 0.005));
    EXPECT_EQ(2.0, bezier.solve(2.0, 0.005));
}

} // namespace