Gracefully handle zero duration curves in CCActiveAnimation

cc/CCActiveAnimationTest.cpp

Index: cc/CCActiveAnimationTest.cpp
diff --git a/cc/CCActiveAnimationTest.cpp b/cc/CCActiveAnimationTest.cpp
index ec589b4edbd72fdbc195a4532edd8c258394cf83..a29da0bbc68f8d74a61d0b7f2b85fd5a1f5d958c 100644
--- a/cc/CCActiveAnimationTest.cpp
+++ b/cc/CCActiveAnimationTest.cpp
@@ -16,13 +16,18 @@ using namespace cc;
 
 namespace {
 
-PassOwnPtr<CCActiveAnimation> createActiveAnimation(int iterations)
+PassOwnPtr<CCActiveAnimation> createActiveAnimation(int iterations, double duration)
 {
-    OwnPtr<CCActiveAnimation> toReturn(CCActiveAnimation::create(adoptPtr(new FakeFloatAnimationCurve), 0, 1, CCActiveAnimation::Opacity));
+    OwnPtr<CCActiveAnimation> toReturn(CCActiveAnimation::create(adoptPtr(new FakeFloatAnimationCurve(duration)), 0, 1, CCActiveAnimation::Opacity));
     toReturn->setIterations(iterations);
     return toReturn.release();
 }
 
+PassOwnPtr<CCActiveAnimation> createActiveAnimation(int iterations)
+{
+    return createActiveAnimation(iterations, 1);
+}
+
 TEST(CCActiveAnimationTest, TrimTimeZeroIterations)
 {
     OwnPtr<CCActiveAnimation> anim(createActiveAnimation(0));
@@ -107,6 +112,15 @@ TEST(CCActiveAnimationTest, TrimTimeSuspendResume)
     EXPECT_EQ(1, anim->trimTimeToCurrentIteration(1024.5));
 }
 
+TEST(CCActiveAnimationTest, TrimTimeZeroDuration)
+{
+    OwnPtr<CCActiveAnimation> anim(createActiveAnimation(0, 0));
+    anim->setRunState(CCActiveAnimation::Running, 0);
+    EXPECT_EQ(0, anim->trimTimeToCurrentIteration(-1));
+    EXPECT_EQ(0, anim->trimTimeToCurrentIteration(0));
+    EXPECT_EQ(0, anim->trimTimeToCurrentIteration(1));
+}
+
 TEST(CCActiveAnimationTest, IsFinishedAtZeroIterations)
 {
     OwnPtr<CCActiveAnimation> anim(createActiveAnimation(0));