EndpointTestWithJukito.java

@RunWith(JukitoRunner.class)
public class EndpointTestWithJukito {
    private final String A_USERNAME = "Bobby";
    private final int USER_ID = 1337;

    @Inject
    private UserInformationService userInformationService;
    @Inject
    private ResponseFactory responseFactory;
    @Inject
    private Endpoint endpoint;

    @Test
    public void getUsername_delegatesToUserInformationService() {
        endpoint.getUsername(USER_ID);

        verify(userInformationService).getUsername(USER_ID);
    }

    @Test
    public void getUsername_returnsOkWhenUserIsFound() {
        Response OK_RESPONSE = new OkResponse();
        given(responseFactory.createOk(A_USERNAME)).willReturn(OK_RESPONSE);
        given(userInformationService.getUsername(USER_ID)).willReturn(A_USERNAME);

        Response result = endpoint.getUsername(USER_ID);

        assertThat(result).isSameAs(OK_RESPONSE);
    }


    @Test
    public void getUser_returnsNotFoundWhenUserIsNotFound() {
        Response NOT_FOUND_RESPONSE = new NotFoundResponse();
        given(responseFactory.createNotFound()).willReturn(NOT_FOUND_RESPONSE);
        given(userInformationService.getUsername(USER_ID)).willThrow(NotFoundException.class);

        Response result = endpoint.getUsername(USER_ID);

        assertThat(result).isSameAs(NOT_FOUND_RESPONSE);
    }
}