Web Animations CSS: Assert underlying value is not used

Source/core/animation/KeyframeAnimationEffectTest.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 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
@@ skipping 323 matching lines @@
 
 TEST(KeyframeAnimationEffect, MultipleIterations)
 {
     KeyframeAnimationEffect::KeyframeVector keyframes = keyframesAtZeroAndOne(pixelAnimatableValue(1.0), pixelAnimatableValue(3.0));
     RefPtr<KeyframeAnimationEffect> effect = KeyframeAnimationEffect::create(keyframes);
     expectDoubleValue(2.0, effect->sample(0, 0.5)->begin()->value->compositeOnto(unknownAnimatableValue(0.0)));
     expectDoubleValue(2.0, effect->sample(1, 0.5)->begin()->value->compositeOnto(unknownAnimatableValue(0.0)));
     expectDoubleValue(2.0, effect->sample(2, 0.5)->begin()->value->compositeOnto(unknownAnimatableValue(0.0)));
 }
 
+TEST(KeyframeAnimationEffect, DependsOnUnderlyingValue)
+{
+    KeyframeAnimationEffect::KeyframeVector keyframes(3);
+    keyframes[0] = Keyframe::create();
+    keyframes[0]->setOffset(0.0);
+    keyframes[0]->setPropertyValue(CSSPropertyLeft, pixelAnimatableValue(1.0));
+    keyframes[0]->setComposite(AnimationEffect::CompositeAdd);
+    keyframes[1] = Keyframe::create();
+    keyframes[1]->setOffset(0.5);
+    keyframes[1]->setPropertyValue(CSSPropertyLeft, pixelAnimatableValue(1.0));
+    keyframes[2] = Keyframe::create();
+    keyframes[2]->setOffset(1.0);
+    keyframes[2]->setPropertyValue(CSSPropertyLeft, pixelAnimatableValue(1.0));
+
+    RefPtr<KeyframeAnimationEffect> effect = KeyframeAnimationEffect::create(keyframes);
+    EXPECT_TRUE(effect->sample(0, 0)->begin()->value->dependsOnUnderlyingValue());
+    EXPECT_TRUE(effect->sample(0, 0.25)->begin()->value->dependsOnUnderlyingValue());

[Steve Block, 2013/08/09 04:32:31]

Testing at 0.25 is a little confusing - it implies there's something special
about the half-way point. We expect the value to be true all the way up to
0.499999, right?

[alancutter (OOO until 2018), 2013/08/09 05:46:31]

Added more stops to test.

+    EXPECT_FALSE(effect->sample(0, 0.5)->begin()->value->dependsOnUnderlyingValue());
+    EXPECT_FALSE(effect->sample(0, 0.75)->begin()->value->dependsOnUnderlyingValue());
+    EXPECT_FALSE(effect->sample(0, 1)->begin()->value->dependsOnUnderlyingValue());
+}
+
 } // namespace