@SuppressWarnings("ResultOfMethodCallIgnored")
@Test
public void toString_returnDefault_resultIsNotMessage() {

    Mockito.doReturn("A").when(mResult).toString();
    ResultListenerProxy proxy = new ResultListenerProxy(mSender);
    proxy.onResult(mResult);
    Mockito.verify(mSender).deliver(mMessageCaptor.capture());
    Message<ResultListener<Object>, Void> message = mMessageCaptor.getValue();
    Assert.assertNotNull(message);
    Assert.assertEquals(".onResult(A)", message.toString());
}