@Test
  public void testTransform_emptyParams() throws Exception {
    ValueMap properties = new ValueMapDecorator(map);

    transformer.transform(layer, properties);

    verifyZeroInteractions(layer);
  }
  @Test
  public void testTransform_neg() throws Exception {
    final int degrees = -15;

    map.put("degrees", -360 + degrees);
    ValueMap properties = new ValueMapDecorator(map);

    transformer.transform(layer, properties);

    verify(layer, times(1)).rotate(degrees);
    verifyNoMoreInteractions(layer);
  }
  @Test
  public void testTransform_nullParams() throws Exception {
    transformer.transform(layer, null);

    verifyZeroInteractions(layer);
  }