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