assertEquals("a溠.net", Punycode.decode("xn--a-999b.net"))
    assertEquals("a\uD8E2\uDF5C.net", Punycode.decode("xn--a-9999b.net"))
    assertNull(Punycode.decode("xn--a-99999b.net"))
  }

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

  @Test fun uppercasePunycode() {
    testDecodeOnly(