@Test fun mixedCasePunycode() {
    testDecodeOnly(
      unicode = "ليهمابتكلموشعربي؟",
      punycode = "Xn--EgBpDaJ6Bu4bXfGeHfVwXn",
    )
  }

  /**
   * It's invalid to have a label longer than 63 characters. If that's requested, the encoder may
   * overflow and return null.
   */
  @Test fun overflowEncodingOversizedLabel() {
    val a1000 = "a".repeat(1000)
    val a1000MaxCodePoint = a1000 + "\udbff\udfff"

fun String.canParseAsIpAddress(): Boolean = VERIFY_AS_IP_ADDRESS.matches(this)

/**
 * Returns true if the length is not valid for DNS (empty or greater than 253 characters), or if any
 * label is longer than 63 characters. Trailing dots are okay.
 */
internal fun String.containsInvalidLabelLengths(): Boolean {
  if (length !in 1..253) return true

  var labelStart = 0
  while (true) {

        "Parsing: <http://f:999999/c> against <http://example.org/foo/bar>",
        "Parsing: <http://192.0x00A80001> against <about:blank>",
        "Parsing: <http://%30%78%63%30%2e%30%32%35%30.01> against <http://other.com/>",
        "Parsing: <http://192.168.0.257> against <http://other.com/>",
        "Parsing: <http://０Ｘｃ０．０２５０．０１> against <http://other.com/>",
      )

    assertInvalid("http://.../", "Invalid URL host: \"...\"")
    assertInvalid("http://…/", "Invalid URL host: \"…\"")
  }

  @Test
  fun labelTooLong() {
    val a63 = "a".repeat(63)
    assertThat(parse("http://$a63/").toString()).isEqualTo("http://$a63/")
    assertThat(parse("http://a.$a63/").toString()).isEqualTo("http://a.$a63/")

class WebPlatformToAsciiTest {
  @Suppress("ktlint:standard:max-line-length")
  val knownFailures =
    setOf(
      // OkHttp rejects empty labels.
      "x..xn--zca",
      "x..ß",
      // OkHttp rejects labels longer than 63 code points, the web platform tests don't.
      "x01234567890123456789012345678901234567890123456789012345678901x.xn--zca",
      "x01234567890123456789012345678901234567890123456789012345678901x.ß",

# No special handling for IPv4 or IPv4-like URLs
http://%30%78%63%30%2e%30%32%35%30.01  s:http p:/ h:192.168.0.1
http://%30%78%63%30%2e%30%32%35%30.01%2e  s:http p:/ h:0xc0.0250.01.
http://192.168.0.257

# Invalid escaping should trigger the regular host error handling.
http://%3g%78%63%30%2e%30%32%35%30%2E.01

# Something that isn't exactly an IP should get treated as a host and

...
BUILD SUCCESSFUL in 1m 30s
63 actionable tasks: 61 executed, 2 up-to-date

```

      } else {
        buf.skip(length.toLong())
      }
    }

    return result
  }

  @Throws(EOFException::class)
  private fun skipName(source: Buffer) {
    // 0 - 63 bytes
    var length = source.readByte().toInt()

    if (length < 0) {
      // compressed name pointer, first two bits are 1
      // drop second byte of compression offset
      source.skip(1)
    } else {

    assertThat(formEncode(59)).isEqualTo("%3B")
    assertThat(formEncode(60)).isEqualTo("%3C")
    assertThat(formEncode(61)).isEqualTo("%3D")
    assertThat(formEncode(62)).isEqualTo("%3E")
    assertThat(formEncode(63)).isEqualTo("%3F")
    assertThat(formEncode(64)).isEqualTo("%40")
    assertThat(formEncode(65)).isEqualTo("A")
    assertThat(formEncode(90)).isEqualTo("Z")
    assertThat(formEncode(91)).isEqualTo("%5B")

    "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"
  },
  {