找不到答案：用成功和失败来包装答案时

Question

在使用错误管理之前，测试工作正常，但一旦按如下方式包装响应，我就开始得到

no answer found for: PostPreviewRepository(#1).getPosts-qim9Vi0(0, continuation {})

测试的目标方法：

override suspend fun getPosts(page: UInt): Result<List<PostPreviewModel>> {
        return try {
            val posts = postService.getPosts(page)
            Success(postPreviewMapper.fromListDto(posts.body()!!.data))
        } catch (e : Exception) {
            Failure(HttpError(e))
        }
    }

映射器

class PostPreviewMapper @Inject constructor(
    private val ownerPreviewMapper: OwnerPreviewMapper,
) {
    fun fromListDto(postPreviews: List<PostPreviewDTO>): List<PostPreviewModel> =
        postPreviews.map { fromDto(it) }

    fun fromDto(postPreview: PostPreviewDTO) = PostPreviewModel(
        id = postPreview.id,
        text = postPreview.text,
        imageUrl = postPreview.image,
        publishDate = postPreview.publishDate,
        owner = ownerPreviewMapper.fromDto(postPreview.owner)
    )
}

单元测试

@Test
    fun `Given repository returns empty list, When GetPostPreviewsUseCase is invoked, Then returns empty list`() =
        runTest {
            // Given
            coEvery { postPreviewRepository.getPosts(23u) } returns Success(emptyList())

            // When
            val postsList = getPostPreviewsUseCase.invoke()

            // Then
            postsList.onSuccess { postsModels ->
                assertTrue(postsModels.isEmpty())
            }
        }

Answer 1

这对我有用：

   @Test
    fun `Given repository returns empty list, When GetPostUseCase is invoked, Then returns empty list`() =
        runTest {
            // Given
            coEvery { postRepository.getPosts(0) } returns ResultOf.Success(emptyList())

            // When
            val postsList = getPostUseCase.invoke(0) as ResultOf.Success

            // Then
            assertTrue(postsList.value.isEmpty())
        }