String::class.java to "hello",
      )
    }
  }

  private fun enableCache(): Cache? {
    cache = makeCache()
    client = client.newBuilder().cache(cache).build()
    return cache
  }

  private fun makeCache(): Cache {
    val cacheDir = File.createTempFile("cache-", ".dir")
    cacheDir.delete()
    return Cache(cacheDir, (1024 * 1024).toLong())
  }