@Test
  public void testRotateImage() {
    Bitmap toRotate = Bitmap.createBitmap(2, 2, Bitmap.Config.ARGB_8888);

    Bitmap zero = TransformationUtils.rotateImage(toRotate, 0);
    assertTrue(toRotate == zero);

    Bitmap ninety = TransformationUtils.rotateImage(toRotate, 90);
    assertTrue(Shadows.shadowOf(ninety).getDescription().contains("rotate=90.0"));
    assertEquals(toRotate.getWidth(), toRotate.getHeight());
  }