Using Mockito with Retrofit 2.0

Question

I'm trying to create unit tests for my api calls(made via Retrofit 2.0) using Mockito.

This seemed to be the most popular blog on using Mockito with Retrofit.

http://mdswanson.com/blog/2013/12/16/reliable-android-http-testing-with-retrofit-and-mockito.html

Unfortunately, it uses earlier versions of Retrofit, and depends on the Callbacks and RetrofitError, which are discontinued from 2.0.

How do you do this with Retrofit 2.0?

P.S.: I'm using RxJava along with retrofit, so something that works with RxJava would be great. Thanks!

Answer 1

on official repository of Retrofit there's an example which can be useful: https://github.com/square/retrofit/tree/master/retrofit-mock

I've also found: https://touk.pl/blog/2014/02/26/mock-retrofit-using-dagger-and-mockito/

Here you would find this fragment:

Unit Tests

During develop of app, you can send requests the server all time(or most of time) so it is possible to live without mocked server, it sucks but is possible. Unfortunately you are not able to write good tests without the mock. Below there are two unit tests. Actually they do not test anything but in simple way shows how to mock Retrofit service using Mockito and Dagger.

    @RunWith(RobolectricTestRunner.class)
public class EchoServiceTest {

    @Inject
    protected EchoService loginService;

    @Inject
    protected Client client;

    @Before
    public void setUp() throws Exception {
        Injector.add(new AndroidModule(), 
                     new RestServicesModule(),
                     new RestServicesMockModule(),
                     new TestModule());
        Injector.inject(this);
    }

    @Test
    public void shouldReturnOfferInAsyncMode() throws IOException {
        //given
        int expectedQuantity = 765;
        String responseContent = "{" +
                "   \"message\": \"mock message\"," +
                "   \"quantity\": \"" + expectedQuantity + "\"" +
                "}";
        mockResponseWithCodeAndContent(200, responseContent);

        //when
        EchoResponse echoResponse = loginService.getMessageAndQuantity("test", "test");

        //then
        assertThat(echoResponse.getQuantity()).isEqualTo(expectedQuantity);
    }

    @Test
    public void shouldReturnOfferInAsyncModea() throws IOException {
        //given
        int expectedQuantity = 2;
        String responseContent = "{" +
                "   \"message\": \"mock message\"," +
                "   \"quantity\": \"" + expectedQuantity + "\"" +
                "}";
        mockResponseWithCodeAndContent(200, responseContent);

        //when
        EchoResponse echoResponse = loginService.getMessageAndQuantity("test", "test");

        //then
        assertThat(echoResponse.getQuantity()).isEqualTo(expectedQuantity);
    }


    protected void mockResponseWithCodeAndContent(int httpCode, String content) throws IOException {
        Response response = createResponseWithCodeAndJson(httpCode, content);
        when(client.execute(Matchers.anyObject())).thenReturn(response);
    }

    private Response createResponseWithCodeAndJson(int responseCode, String json) {
        return new Response(responseCode, "nothing", Collections.EMPTY_LIST, new TypedByteArray("application/json", json.getBytes()));
    }

Read also: Square retrofit server mock for testing

Hope it help