@Test
  public void testInitialState() {
    // initially only the fist layer is displayed and there is no transition
    Assert.assertEquals(FadeDrawable.TRANSITION_NONE, mFadeDrawable.mTransitionState);
    Assert.assertEquals(255, mFadeDrawable.mAlphas[0]);
    Assert.assertEquals(255, mFadeDrawable.mAlphas[1]);
    Assert.assertEquals(255, mFadeDrawable.mAlphas[2]);
    Assert.assertEquals(true, mFadeDrawable.mIsLayerOn[0]);
    Assert.assertEquals(true, mFadeDrawable.mIsLayerOn[1]);
    Assert.assertEquals(true, mFadeDrawable.mIsLayerOn[2]);
  }
Tests {@link FadeDrawable} where all layers are visible per default. * @see FadeDrawableTest for
more tests
drawee/src/test/java/com/facebook/drawee/drawable/FadeDrawableAllOnTest.java