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