MainActivityTest - configuring mirror

MainActivityTest.java

@RunWith(AndroidJUnit4.class)
public class MainActivityTest {

  private MockWebServer server;
  
  @Rule
  public ActivityTestRule<MainActivity> mActivityRule = new ActivityTestRule<>(MainActivity.class, false, false);
  
  @Before
  public void setUp() throws Exception {
      server = new MockWebServer();
      server.start();
      setupServerUrl();
  }
  
  @After
  public void tearDown() throws IOException {
      server.shutdown();
  }
  
  private void setupServerUrl() {
      String url = server.url("/").toString();
      
      HttpLoggingInterceptor interceptor = new HttpLoggingInterceptor();
      interceptor.setLevel(HttpLoggingInterceptor.Level.BODY);
      
      OkHttpClient client = new OkHttpClient.Builder().addInterceptor(interceptor).build();
      
      final UsersApi usersApi = UsersApi.getInstance();
      
      final Api api = new Retrofit.Builder()
            .baseUrl(url)
            .addConverterFactory(GsonConverterFactory.create(UsersApi.GSON))
            .client(client)
            .build()
            .create(Api.class);
            
      setField(usersApi, "api", api);
  }
  
  private void setField(Object target, String fieldName, Object value) {
      new Mirror()
              .on(target)
              .set()
              .field(fieldName)
              .withValue(value);
  }
}