需要测试的方法-位于AnalyticsServiceImpl.java类
public void trackSplashState(MeasurementViewEnum measurementViewEnum) { HashMap<String, Object> data = createCommonData(measurementViewEnum); MeasureServiceImpl.StartStatus status = mMeasureService.getLaunchStatus(); switch (status) { case INSTALL: data.put(APP_EVENT_INSTALL, INSTALL); break; case LAUNCH: data.put(APP_EVENT_LAUNCH, LAUNCH); break; case UPDATE: data.put(APP_EVENT_UPDATE, UPDATE); break; } trackState(measurementViewEnum, data); }
测试类
@Config(constants = BuildConfig.class, sdk = TestConfig.SDK)
@RunWith(RobolectricTestRunner.class)
public class AnalyticsServiceImplTest {
@Module(includes = TestAppModule.class, injects = AnalyticsServiceImplTest.class, overrides = true)
static class TestModule {
}
@Inject
AnalyticsServiceImpl analyticsServiceImpl;
@Inject
MeasureServiceImpl measureService;
@Inject
Context mContext;
@Inject
LoginService mLoginService;
@Captor
ArgumentCaptor<HashMap<String, Object>> data;
@Captor
ArgumentCaptor<String[]> varargs;
private ArgumentCaptor<MeasurementViewEnum> enumArgumentCaptor;
@Before
public void setUp() throws Exception {
Services.initialize(new AnalyticsServiceImplTest.TestModule()).inject(this);
enumArgumentCaptor = ArgumentCaptor.forClass(MeasurementViewEnum.class);
}
@After
public void tearDown() throws Exception {
}
@Test
public void trackSplashState_shouldReturnInstall_whenLaunchStatusEqualsINSTALL() throws Exception {
analyticsServiceImpl = mock(AnalyticsServiceImpl.class);
MeasureServiceMock measureServiceMock = new MeasureServiceMock();
measureServiceMock.setStatus(MeasureServiceImpl.StartStatus.INSTALL);
analyticsServiceImpl.mMeasureService = measureServiceMock;
analyticsServiceImpl.trackSplashState(MeasurementViewEnum.SPLASH);
verify(analyticsServiceImpl, times(1)).trackState(enumArgumentCaptor.capture(), data.capture());
}
}
当我运行此测试用例时,在最后一行出现了空指针异常。我对单元测试有点陌生。您能解释一下我在这段代码中犯的错误吗?
答案 0 :(得分:1)
1)您正在嘲笑无法正常工作的SUT:
analyticsServiceImpl = mock(AnalyticsServiceImpl.class);
您将验证其trackState
方法,因此需要对其进行监视:
analyticsServiceImpl = spy(new AnalyticsServiceImpl());
2)您正在捕获输入,但是没有以任何方式声明它们。我想你错过了:
verify(analyticsServiceImpl, times(1)).trackState(enumArgumentCaptor.capture(), data.capture());
Map<String, Object> dataCaptured = data.getValue();
MeasurementViewEnum enumCapture = enumArgumentCaptor.getValue();
// assert these values
更新:
@Before
public void setUp() throws Exception {
MockitoAnnotation.initMocks(this);
}