NoOpCallback implements Callback<Response> { @Override public void success(Response resp, Response response) { }  @Override void success(Response resp, Response response); @Override void failure(RetrofitError error);  }
@Test public void testSuccess() { NoOpCallback noOpCallback = new NoOpCallback(); Response mockResponse = mock(Response.class); noOpCallback.success(mockResponse, mockResponse); verifyZeroInteractions(mockResponse); }