如何使用Retrofit 2.0和新的MockRetrofit类来模拟服务？

使用Retrofit 1，我们用来模拟Web服务并模拟网络延迟，如下所示：

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）， MyServiceMock是实现此接口的类。

在Retrofit 2.0.0-beta3中，有一个尚未记录的全新模拟系统（参见： https ： //github.com/square/retrofit/pull/1343 ）。 当我尝试类似的东西，我得到：

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

如何将呼叫转发到MyServiceMock ？

Answer 1

假设接口定义如下：

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

调用将使用BehaviorDelegate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。

 public class MyServiceMock implements MyService { private final BehaviorDelegate delegate; public MyServiceMock(BehaviorDelegate delegate) { this.delegate = delegate; } public Observable name() { return delegate.returningResponse("test").name(); } } 

使用模拟服务的测试样本如下所示：

 public class MyServiceTest { private final NetworkBehavior behavior = NetworkBehavior.create(); private final rx.observers.TestSubscriber 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 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); } }