part = MultipartBody.Part.createFormData("", null, requestBody)
    val headers: Headers? = part.headers
    val body: RequestBody = part.body
  }

  @Test
  fun multipartBodyBuilder() {
    val requestBody = "".toRequestBody(null)
    var builder: MultipartBody.Builder = MultipartBody.Builder()
    builder = MultipartBody.Builder("")
    builder = builder.setType("".toMediaType())