Square retrofit server mock for testing

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Mock Retrofit 2.0 Requests for Testing

As the old mechanisms like creating MockClient class and implementing it from Client are not working anymore with Retrofit 2.0, here I describe a new way of doing that. All what you need to do now is to add your custom interceptors for OkHttpClient like it is shown below. FakeInterceptor class just overrides intercept method and in the case if application is in DEBUG mode return given JSON.

RestClient.java

public final class RestClient {

    private static IRestService mRestService = null;

    public static IRestService getClient() {
        if(mRestService == null) {
            final OkHttpClient client = new OkHttpClient();
            // ***YOUR CUSTOM INTERCEPTOR GOES HERE***
            client.interceptors().add(new FakeInterceptor());

            final Retrofit retrofit = new Retrofit.Builder()
                            // Using custom Jackson Converter to parse JSON
                            // Add dependencies:
                            // com.squareup.retrofit:converter-jackson:2.0.0-beta2
                    .addConverterFactory(JacksonConverterFactory.create())
                            // Endpoint
                    .baseUrl(IRestService.ENDPOINT)
                    .client(client)
                    .build();

            mRestService = retrofit.create(IRestService.class);
        }
        return mRestService;
    }
}

IRestService.java

public interface IRestService {

    String ENDPOINT = "http://www.vavian.com/";

    @GET("https://stackoverflow.com/")
    Call<Teacher> getTeacherById(@Query("id") final String id);
}

FakeInterceptor.java

public class FakeInterceptor implements Interceptor { 
    // FAKE RESPONSES.
    private final static String TEACHER_ID_1 = "{\"id\":1,\"age\":28,\"name\":\"Victor Apoyan\"}";
    private final static String TEACHER_ID_2 = "{\"id\":1,\"age\":16,\"name\":\"Tovmas Apoyan\"}";

    @Override
    public Response intercept(Chain chain) throws IOException {
        Response response = null;
        if(BuildConfig.DEBUG) {
            String responseString;
            // Get Request URI.
            final URI uri = chain.request().url().uri();
            // Get Query String.
            final String query = uri.getQuery();
            // Parse the Query String.
            final String[] parsedQuery = query.split("=");
            if(parsedQuery[0].equalsIgnoreCase("id") && parsedQuery[1].equalsIgnoreCase("1")) {
                responseString = TEACHER_ID_1;
            }
            else if(parsedQuery[0].equalsIgnoreCase("id") && parsedQuery[1].equalsIgnoreCase("2")){
                responseString = TEACHER_ID_2;
            }
            else {
                responseString = "";
            }

            response = new Response.Builder()
                    .code(200)
                    .message(responseString)
                    .request(chain.request())
                    .protocol(Protocol.HTTP_1_0)
                    .body(ResponseBody.create(MediaType.parse("application/json"), responseString.getBytes()))
                    .addHeader("content-type", "application/json")
                    .build();
        }
        else {
            response = chain.proceed(chain.request());
        }

        return response;
    }
}

Source code of project on GitHub

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