[
    "This resource is focused on highlighting issues with UTS #46 ToASCII",
    {
      "comment": "Label with hyphens in 3rd and 4th position",
      "input": "aa--",
      "output": "aa--"
    },
    {
      "input": "a†--",
      "output": "xn--a---kp0a"
    },
    {
      "input": "ab--c",
      "output": "ab--c"
    },
    {
      "comment": "Label with leading hyphen",
      "input": "-x",
      "output": "-x"
    },
    {
      "input": "-†",
      "output": "xn----xhn"
    },
    {
      "input": "-x.xn--nxa",
      "output": "-x.xn--nxa"
    },
    {
      "input": "-x.β",
      "output": "-x.xn--nxa"
    },
    {
      "comment": "Label with trailing hyphen",
      "input": "x-.xn--nxa",
      "output": "x-.xn--nxa"
    },
    {
      "input": "x-.β",
      "output": "x-.xn--nxa"
    },
    {
      "comment": "Empty labels",
      "input": "x..xn--nxa",
      "output": "x..xn--nxa"
    },
    {
      "input": "x..β",
      "output": "x..xn--nxa"
    },
    {
      "comment": "Invalid Punycode",
      "input": "xn--a",
      "output": null
    },
    {
      "input": "xn--a.xn--nxa",
      "output": null
    },
    {
      "input": "xn--a.β",
      "output": null
    },
    {
      "comment": "Valid Punycode",
      "input": "xn--nxa.xn--nxa",
      "output": "xn--nxa.xn--nxa"
    },
    {
      "comment": "Mixed",
      "input": "xn--nxa.β",
      "output": "xn--nxa.xn--nxa"
    },
    {
      "input": "ab--c.xn--nxa",
      "output": "ab--c.xn--nxa"
    },
    {
      "input": "ab--c.β",
      "output": "ab--c.xn--nxa"
    },
    {
      "comment": "CheckJoiners is true",
      "input": "\u200D.example",
      "output": null
    },
    {
      "input": "xn--1ug.example",
      "output": null
    },
    {
      "comment": "CheckBidi is true",
      "input": "يa",
      "output": null
    },
    {
      "input": "xn--a-yoc",
      "output": null
    },
    {
      "comment": "processing_option is Nontransitional_Processing",
      "input": "ශ්‍රී",
      "output": "xn--10cl1a0b660p"
    },
    {
      "input": "نامه‌ای",
      "output": "xn--mgba3gch31f060k"
    },
    {
      "comment": "U+FFFD",
      "input": "\uFFFD.com",
      "output": null
    },
    {
      "comment": "U+FFFD character encoded in Punycode",
      "input": "xn--zn7c.com",
      "output": null
    },
    {
      "comment": "Label longer than 63 code points",
      "input": "x01234567890123456789012345678901234567890123456789012345678901x",
      "output": "x01234567890123456789012345678901234567890123456789012345678901x"
    },
    {
      "input": "x01234567890123456789012345678901234567890123456789012345678901†",
      "output": "xn--x01234567890123456789012345678901234567890123456789012345678901-6963b"
    },
    {
      "input": "x01234567890123456789012345678901234567890123456789012345678901x.xn--nxa",
      "output": "x01234567890123456789012345678901234567890123456789012345678901x.xn--nxa"
    },
    {
      "input": "x01234567890123456789012345678901234567890123456789012345678901x.β",
      "output": "x01234567890123456789012345678901234567890123456789012345678901x.xn--nxa"
    },
    {
      "comment": "Domain excluding TLD longer than 253 code points",
      "input": "01234567890123456789012345678901234567890123456789.01234567890123456789012345678901234567890123456789.01234567890123456789012345678901234567890123456789.01234567890123456789012345678901234567890123456789.0123456789012345678901234567890123456789012345678.x",
      "output": "01234567890123456789012345678901234567890123456789.01234567890123456789012345678901234567890123456789.01234567890123456789012345678901234567890123456789.01234567890123456789012345678901234567890123456789.0123456789012345678901234567890123456789012345678.x"
    },
    {
      "input": "01234567890123456789012345678901234567890123456789.01234567890123456789012345678901234567890123456789.01234567890123456789012345678901234567890123456789.01234567890123456789012345678901234567890123456789.0123456789012345678901234567890123456789012345678.xn--nxa",
      "output": "01234567890123456789012345678901234567890123456789.01234567890123456789012345678901234567890123456789.01234567890123456789012345678901234567890123456789.01234567890123456789012345678901234567890123456789.0123456789012345678901234567890123456789012345678.xn--nxa"
    },
    {
      "input": "01234567890123456789012345678901234567890123456789.01234567890123456789012345678901234567890123456789.01234567890123456789012345678901234567890123456789.01234567890123456789012345678901234567890123456789.0123456789012345678901234567890123456789012345678.β",
      "output": "01234567890123456789012345678901234567890123456789.01234567890123456789012345678901234567890123456789.01234567890123456789012345678901234567890123456789.01234567890123456789012345678901234567890123456789.0123456789012345678901234567890123456789012345678.xn--nxa"
    }
  ]