@Test
 public void testOnCancel() {
   target.onCancel(null);
 }
 @Test
 public void testOnFailure() {
   target.onFailure(null, null);
 }
 @Test
 public void testOnSuccess() {
   target.onSuccess(null, null);
 }
 @Test
 public void testOnProgress() {
   target.onProgress(0, 0);
 }
 @Test
 public void testOnEnd() {
   target.onEnd();
 }
 @Test
 public void testOnStart() {
   target.onStart();
 }