EchoCustomControllerTest.java

public class EchoControllerTest extends ControllerTest<EchoController> {
  private EchoService echoService;

  @Before
  public void setup() {
    echoService = (EchoService) getField(EchoService.class);
    when(echoService.reverse(eq("input"))).thenReturn("tupni");
  }

  @Test
  public void echo() throws Exception {
    String input = "input";
    String reverse = new StringBuilder(input).reverse().toString();

    Response response = target("echo")
        .path(input)
        .request()
        .get();

    assertEquals(Status.OK.getStatusCode(), response.getStatus());
    assertEquals(MediaType.APPLICATION_JSON_TYPE, response.getMediaType());
    assertEquals(reverse, response.readEntity(Echo.class).getEcho());
    }
}