.addHeader("Content-Encoding", "deflate")
        .gzip()
        .build()
    }.also {
      assertThat(it).hasMessage("Content-Encoding already set: deflate")
    }
  }

  @Test
  fun cannotGzipTwice() {
    assertFailsWith<IllegalStateException> {
      Request
        .Builder()
        .url("https://square.com/")
        .post("This is the original message".toRequestBody())
        .gzip()