Android testing - Robolectric + Mockito + Retrofit getting Wanted but not invoked 错误

Question

尝试使用 Robolectric 和 Mockito 在我的 Android 应用程序中测试我的 Retrofit 调用，但我收到以下错误：

Wanted but not invoked: mockApi.register( , ); -> at ServiceTest.testAPI(ServiceTest.java:58) Actually, there were zero interactions with this mock.

RetroFit API调用在接口中定义如下：

@FormUrlEncoded
@POST("/register")
void register(
        @FieldMap Map<String, String> registrationParams,
        Callback<JsonObject> response) ;

我的测试class如下：

@Config(constants = BuildConfig.class)
@RunWith(TestRunner.class)
public class SharedServiceTest {

private RegistrationActivity activity;
@Mock
private SharedService mockApi;

@Captor
private ArgumentCaptor<Callback<JsonObject>> cb;


@Before
public void setUp() {

    MockitoAnnotations.initMocks(this);
    ActivityController<RegistrationActivity> controller = Robolectric.buildActivity(RegistrationActivity.class);
    activity = controller.get();

    controller.create();
}

@Test
public void testAPI() throws Exception {

    activity.populateFields();
    activity.validateFields();
    activity.register("");

    Mockito.verify(mockApi).register(Mockito.anyMap(), cb.capture());

    JsonObject jsonObject = new JsonObject();
    jsonObject.addProperty("sessionToken", Mockito.anyString());
    jsonObject.addProperty("userId", Mockito.anyString());

    cb.getValue().success(jsonObject, null);

    Assert.assertTrue(ShadowToast.getTextOfLatestToast().contains("Registration completed"));

}

}

我的RegistrationActivity中使用API的方法如下：

public void register(){

       MyApplication.getInstance().getSharedService().register(mRegistrationParams, new Callback<JsonObject>() {
            @Override
            public void success(JsonObject jsonObject, retrofit.client.Response response) {
                Toast.makeText(RegistrationActivity.this, "Registration completed", Toast.LENGTH_LONG).show();
            }

            @Override
            public void failure(RetrofitError error) {
                Toast.makeText(RegistrationActivity.this, RetrofitUtils.getErrorMessage(error), Toast.LENGTH_LONG).show();
            }
        });

    }

真正的 Retrofit 服务来自我自己的应用程序 class，我在我的测试文件夹中模拟了它以供 robolectric 使用：

public class TestMyApplication extends MyApplication
        implements TestLifecycleApplication {

    @Override
    public void onCreate() {
        super.onCreate();
    }

    @Override public void beforeTest(Method method) {
    }

    @Override public void prepareTest(Object test) {
    }

    @Override public void afterTest(Method method) {
    }

    @Override public CPSharedService getCPSharedService() {
        return Mockito.mock(SharedService.class);
    }
}

我搜索了 SO 上出现此错误的其他问题，但其中 none 匹配我在这里尝试做的事情或为我的问题提供解决方案，所以我只是想知道我在做什么错了？

Answer 1

您 TestMyApplication 中 SharedService 的模拟实例与您声明的测试 class 不同。 Mockito.verify(mockApi).register(Mockito.anyMap(), cb.capture()); 失败是因为 mockApi 字段引用的实例实际上从未被调用过。另一个问题是 TestMyApplication 中的 getter 总是 returns 每个调用的新模拟：

    @Override public CPSharedService getCPSharedService() {
        return Mockito.mock(SharedService.class); //this creates a new "mocked" instance 
    }

我不是 100% 清楚你的场景，但如果你能让你的测试在你的 TestMyApplication 实例中设置 mockApi 字段的实例会更好：

public class TestMyApplication extends MyApplication
        implements TestLifecycleApplication {

    private SharedService sharedService;

    @Override
    public void onCreate() {
        super.onCreate();
    }

    @Override public void beforeTest(Method method) {
    }

    @Override public void prepareTest(Object test) {
    }

    @Override public void afterTest(Method method) {
    }

    @Override public CPSharedService getCPSharedService() {
        return this.sharedService;
    }

    public void setCPSharedService(SharedService sharedService) {
        // store your mock
        this.sharedService = sharedService;
    }
}

在你的测试中 class:

@Test
public void testAPI() throws Exception  {

    // configure you TestMyApplication
    assertTrue(MyApplication.getInstance() instanceof TestMyApplication);
    TestMyApplication testMyApp = (TestMyApplication) MyApplication.getInstance();
    testMyApp.setCPSharedService(this.mockApi);

    activity.populateFields();
    activity.validateFields();
    activity.register("");

    Mockito.verify(this.mockApi).register(Mockito.anyMap(), cb.capture());

    ...

}

Android testing - Robolectric + Mockito + Retrofit getting Wanted but not invoked 错误

Android testing - Robolectric + Mockito + Retrofit getting Wanted but not invoked error

java

android

mockito

robolectric

retrofit