= null
jsonReader.beginObject() when (jsonReader.nextNamecarousels" -> ApiCarouselGroup(JsonReader(StringReader(jsonObject.toString()))) var titles: List<ApiTitle>?
expect(useCase.randomWords(), expectedRandomWords); });但是它返回了这个错误:type 'Null' is not a subtype of type 'String'在行when(mockRepository.get()).thenReturn(expectedRandomWords