return object : RequestBody() {
          override fun contentLength(): Long = body.utf8Size()

          override fun contentType(): MediaType? = null

          override fun writeTo(sink: BufferedSink) {
            sink.writeUtf8(body)
          }
        }
      }
    },

    END_OF_STREAM {
      override fun setBody(
        response: MockResponse.Builder,
        content: Buffer?,

          object : RequestBody() {
            var attempt = 0

            override fun contentType(): MediaType? {
              return null
            }

            override fun writeTo(sink: BufferedSink) {
              sink.writeUtf8("attempt " + attempt++)
            }

            override fun isOneShot(): Boolean {
              return true
            }
          },
      )

      object : ForwardingFileSystem(fileSystem) {
        override fun onPathParameter(
          path: Path,
          functionName: String,
          parameterName: String,
        ): Path {
          events.add("$functionName:$path")
          return path
        }

        override fun onPathResult(
          path: Path,
          functionName: String,
        ): Path {