@Test public void lightService_requestByEnvironment() { Integer ENVIRONMENT = 108; List<LightModel> lights = new ArrayList<>(); mockClient(); when(lightRepository.findByEnvironment(ENVIRONMENT)).thenReturn(Observable.just(lights)); TestSubscriber<List<LightModel>> tester = new TestSubscriber<>(); lightService.requestByEnvironment(ENVIRONMENT).subscribe(tester); tester.assertValue(lights); tester.assertCompleted(); tester.assertNoErrors(); }