如何使用Retrofit 2.0和新的MockRetrofit类模拟服务?

问题描述

我们使用Retrofit 1模拟Web服务并模拟网络延迟，如下所示:

Using Retrofit 1 we used to mock web services and simulate network latency as following:

MockRestAdapter mockRestAdapter = MockRestAdapter.from(restAdapter);
return mockRestAdapter.create(MyService.class, new MyServiceMock());

其中 MyService 是服务接口(将响应作为Rx Observables返回)，而 MyServiceMock 是实现此接口的类.

Where MyService is the service Interface (returning responses as Rx Observables), and MyServiceMock is a class that implements this interface.

在Retrofit 2.0.0-beta3中，有一个全新的模拟系统(请参阅: https://github.com/square/retrofit/pull/1343 )，但尚未记录.当尝试类似的东西时，我得到:

In Retrofit 2.0.0-beta3 there is a brand new mocking system (see: https://github.com/square/retrofit/pull/1343) that is not yet documented.When trying to to something similar I get:

MockRetrofit mockRetrofit = new MockRetrofit.Builder(retrofit).build();
BehaviorDelegate<AuthService> delegate = mockRetrofit.create(MyService.class);

如何将呼叫转发到 MyServiceMock ?

推荐答案

假设接口定义如下:

public interface MyService {
    @GET("/name")
    rx.Observable<String> name();
}

将使用 BehaviorDelegate 将呼叫转发到 MyServiceMock . BehaviorDelegate 将 NetworkBehavior 应用于模拟创建的响应.请注意，下面的模拟实现将 BehaviorDelegate 作为构造函数参数，并使用它来返回响应.

Calls will be forwarded to MyServiceMock using BehaviorDelegate. The BehaviorDelegate applies NetworkBehavior to the responses created by the mock. Note that the mock implementation below takes the BehaviorDelegate as a constructor argument and uses it to return the response.

public class MyServiceMock implements MyService {
    private final BehaviorDelegate<MyService> delegate;

    public MyServiceMock(BehaviorDelegate<MyService> delegate) {
        this.delegate = delegate;
    }

    public Observable<String> name() {
        return delegate.returningResponse("test").name();
    }
}

使用模拟服务的测试示例如下所示:

A sample of a test using the mock service is as shown below:

public class MyServiceTest {

    private final NetworkBehavior behavior = NetworkBehavior.create();
    private final rx.observers.TestSubscriber<String> testSubscriber = TestSubscriber.create();
    private MyService mockService;

    @Before
    public void setUp() throws Exception {
        Retrofit retrofit = new Retrofit.Builder()
                .addCallAdapterFactory(RxJavaCallAdapterFactory.create())
                .baseUrl("http://example.com").build();

        MockRetrofit mockRetrofit = new MockRetrofit.Builder(retrofit)
                .networkBehavior(behavior).build();

        final BehaviorDelegate<MyService> delegate = mockRetrofit.create(MyService.class);

        mockService = new MyServiceMock(delegate);
    }

    @Test
    public void testSuccessResponse() throws Exception {
        givenNetworkFailurePercentIs(0);

        mockService.name().subscribe(testSubscriber);

        testSubscriber.assertValue("test");
        testSubscriber.assertCompleted();
    }

    @Test
    public void testFailureResponse() throws Exception {
        givenNetworkFailurePercentIs(100);

        mockService.name().subscribe(testSubscriber);

        testSubscriber.assertNoValues();
        testSubscriber.assertError(IOException.class);
    }

    private void givenNetworkFailurePercentIs(int failurePercent) {
        behavior.setDelay(0, MILLISECONDS);
        behavior.setVariancePercent(0);
        behavior.setFailurePercent(failurePercent);
    }
}

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