### Question:
RestAuthHttpCallbackHandler extends AbstractRestAuthCallbackHandler<HttpCallback> { public String getCallbackClassName() { return CALLBACK_NAME; }  boolean updateCallbackFromRequest(HttpServletRequest request, HttpServletResponse response,
            HttpCallback callback); HttpCallback handle(HttpServletRequest request, HttpServletResponse response,
            JsonValue postBody, HttpCallback originalCallback); String getCallbackClassName(); JsonValue convertToJson(HttpCallback callback, int index); HttpCallback convertFromJson(HttpCallback callback, JsonValue jsonCallback);  }### Answer:
@Test public void shouldGetCallbackClassName() { String callbackClassName = restAuthHttpCallbackHandler.getCallbackClassName(); assertEquals(HttpCallback.class.getSimpleName(), callbackClassName); }