AnimatorTestRule
public final class AnimatorTestRule implements TestRule
JUnit TestRule that can be used to run Animators without actually waiting for the duration of the animation. This also helps the test to be written in a deterministic manner. Create an instance of AnimatorTestRule and specify it as a org.junit.ClassRule of the test class. Use advanceTimeBy to advance animators that have been started. Note that advanceTimeBy should be called from the same thread you have used to start the animator.
@SmallTest @RunWith(AndroidJUnit4.class) public class SampleAnimatorTest { @ClassRule public static AnimatorTestRule sAnimatorTestRule = new AnimatorTestRule(); @UiThreadTest @Test public void sample() { final ValueAnimator animator = ValueAnimator.ofInt(0, 1000); animator.setDuration(1000L); assertThat(animator.getAnimatedValue(), is(0)); animator.start(); sAnimatorTestRule.advanceTimeBy(500L); assertThat(animator.getAnimatedValue(), is(500)); } }
Summary
Public constructors |
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Public methods |
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void |
advanceTimeBy(long timeDelta)Advances the animation clock by the given amount of delta in milliseconds. |
@NonNull Statement |
apply(@NonNull Statement base, @NonNull Description description) |
long |
Returns the current time in milliseconds tracked by AnimationHandler. |
Public constructors
Public methods
advanceTimeBy
public void advanceTimeBy(long timeDelta)
Advances the animation clock by the given amount of delta in milliseconds. This call will produce an animation frame to all the ongoing animations. This method needs to be called on the same thread as start.
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long timeDelta |
the amount of milliseconds to advance |
apply
public @NonNull Statement apply(@NonNull Statement base, @NonNull Description description)
getCurrentTime
public long getCurrentTime()
Returns the current time in milliseconds tracked by AnimationHandler. Note that this is a different time than the time tracked by SystemClock This method needs to be called on the same thread as start.