Spring boot 带有多部分文件上载的WebTestClient

我正在使用SpringBoot+Webflux构建一个微服务，我有一个端点可以接受多部分文件上传。当我用curl和Postman测试时，它工作得很好

@PostMapping("/upload", consumes = [MULTIPART_FORM_DATA_VALUE])
fun uploadVideo(@RequestPart("video") filePart: Mono<FilePart>): Mono<UploadResult> {

    log.info("Video upload request received")

    return videoFilePart.flatMap { video ->
        val fileName = video.filename()

        log.info("Saving video to tmp directory: $fileName")

        val file = temporaryFilePath(fileName).toFile()

        video.transferTo(file)
          .thenReturn(UploadResult(true))
          .doOnError { error ->
              log.error("Failed to save video to temporary directory", error)
          }
          .onErrorMap {
              VideoUploadException("Failed to save video to temporary directory")
          }
    }
}

@Test
fun shouldSuccessfullyUploadVideo() {
    client.post()
        .uri("/video/upload")
        .contentType(MULTIPART_FORM_DATA)
        .syncBody(generateBody())
        .exchange()
        .expectStatus()
        .is2xxSuccessful
}

private fun generateBody(): MultiValueMap<String, HttpEntity<*>> {
    val builder = MultipartBodyBuilder()
    builder.part("video", ClassPathResource("/videos/sunset.mp4"))
    return builder.build()
}

class VideoUploadException(reason: String) : ResponseStatusException(HttpStatus.INTERNAL_SERVER_ERROR, reason)