如何测试Retrofit2 + RxJava2 api调用？

Question

I am wondering how to test Retrofit2 call via rxjava2. My retrofit api interface looks like:

public interface LoginApiMapping {
   @POST("v1/secm/oam/oauth2/token")
   Observable<Response<RestResponseHolder<LoginResponseModel>>> login(@Body LoginModel model);
}

and i would like to write the test which will send this request via RxJava2 and check the response. I consider that there is the problem with RxJava as it is asynchronous and the test finishes before i get the response, so i tried to use TestSubscriber as below, but it's not possible to subscribe TestSubscriber<Response<RestResponseHolder<LoginResponseModel>>> as i expected

@Test
public void loginTest(){
    Context appContext = InstrumentationRegistry.getTargetContext();
    Api t = TestApi.create(appContext);
    LoginModel loginModel = new LoginModel("username","password");
    TestSubscriber<Response<RestResponseHolder<LoginResponseModel>>> testSubscriber = new TestSubscriber<>();
    t.get(LoginApiMapping.class).login(loginModel).subscribe(testSubscriber);
}

anyone who solved that? thanks

Answer 1

I finally found the solution, so i decided to post it here. First you have to call toFlowable() on the observable and set the Backpressure strategy and then you can subscribe with TestSubscriber as below

t.get(LoginApiMapping.class).login(loginModel).toFlowable(BackpressureStrategy.DROP).subscribe(testSubscriber);

Then add

testSubscriber.awaitTerminalEvent();

at the end that you can check various assertions on testSubscriber as R. Zagórski pointed in answer above.

Answer 2

At the end of of test add:

testSubscriber.awaitTerminalEvent();

Then you can check various assertions on testSubscriber .

Answer 3

You use TestSubscriber with Flowable and TestObserver with Observable. You can test Single, Completable and Maybe by converting them to either Flowable or Observable, but the built-in test()s for these three return TestSubscriber.