ControllerTest.java

public abstract class ControllerTest<T> extends JerseyTest {

  private Class<T> controllerClass;
  private T controller;
  private Map<String, Object> args;

  @Rule
  public ExpectedException expectedException = ExpectedException.none();

  @Override
  public Application configure() {
    try {
      init();
    } catch (NoSuchMethodException | IllegalAccessException | InvocationTargetException | InstantiationException e) {
      System.err.println(e);
      System.err.println(e.getMessage());
      e.printStackTrace(System.err);
      fail();
    }
    return testResourceConfig(asArray(EchoUserProvider.class, controllerClass), controller);
  }

  private void init()
      throws NoSuchMethodException, IllegalAccessException, InvocationTargetException, InstantiationException {
    controllerClass = (Class<T>)
        ((ParameterizedType) getClass().getGenericSuperclass())
            .getActualTypeArguments()[0];

    Constructor<T> testConstructor = findTestConstructor(controllerClass);
    Object[] parameters = createMockConstructorParameters(testConstructor);
    args = createArgumentMap(parameters);

    controller = testConstructor.newInstance(parameters);
  }

  protected T getController() {
    return controller;
  }

  protected Object getField(Class argClass) {
    return args.get(argClass.getSimpleName());
  }
}