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