assertNull(Punycode.decode("xn--a-99999b.net"))
  }

  @Test fun dashInPrefix() {
    testEncodeDecode(
      unicode = "klmnöpqrst-uvwxy",
      punycode = "xn--klmnpqrst-uvwxy-ctb",
    )
  }

  @Test fun uppercasePunycode() {
    testDecodeOnly(
      unicode = "ليهمابتكلموشعربي؟",
      punycode = "XN--EGBPDAJ6BU4BXFGEHFVWXN",
    )
  }