assertUnescaped(e, '_');
    assertUnescaped(e, '.');
    assertUnescaped(e, '*');

    assertEscaping(e, "%00", '\u0000'); // nul
    assertEscaping(e, "%7F", '\u007f'); // del
    assertEscaping(e, "%C2%80", '\u0080'); // xx-00010,x-000000
    assertEscaping(e, "%DF%BF", '\u07ff'); // xx-11111,x-111111
    assertEscaping(e, "%E0%A0%80", '\u0800'); // xxx-0000,x-100000,x-00,0000

      }
    }

    // Testing multibyte escape sequences
    assertEscaping(e, "%00", '\u0000'); // nul
    assertEscaping(e, "%7F", '\u007f'); // del
    assertEscaping(e, "%C2%80", '\u0080'); // xx-00010,x-000000
    assertEscaping(e, "%DF%BF", '\u07ff'); // xx-11111,x-111111
    assertEscaping(e, "%E0%A0%80", '\u0800'); // xxx-0000,x-100000,x-00,0000

  private static final String LARGEST_SURROGATE =
      "" + Character.MAX_HIGH_SURROGATE + Character.MAX_LOW_SURROGATE;

  private static final String TEST_STRING =
      "\0abyz\u0080\u0100\u0800\u1000ABYZ\uffff" + SMALLEST_SURROGATE + "0189" + LARGEST_SURROGATE;

  // Escapes nothing
  private static final UnicodeEscaper NOP_ESCAPER =
      new UnicodeEscaper() {
        @Override

  private static final String LARGEST_SURROGATE =
      "" + Character.MAX_HIGH_SURROGATE + Character.MAX_LOW_SURROGATE;

  private static final String TEST_STRING =
      "\0abyz\u0080\u0100\u0800\u1000ABYZ\uffff" + SMALLEST_SURROGATE + "0189" + LARGEST_SURROGATE;

  // Escapes nothing
  private static final UnicodeEscaper NOP_ESCAPER =
      new UnicodeEscaper() {
        @Override

    assertForbiddenHeader("\u0000")
    assertForbiddenHeader("\r")
    assertForbiddenHeader("\n")
    assertForbiddenHeader("\u001f")
    assertForbiddenHeader("\u007f")
    assertForbiddenHeader("\u0080")
    assertForbiddenHeader("\ud83c\udf69")
  }

  private fun assertForbiddenHeader(s: String) {
    val builder = Request.Builder()
    assertFailsWith<IllegalArgumentException> {

    static final int ATTR_ARCHIVE    = 0x20;

    // extended file attribute encoding(others same as above)
    static final int ATTR_COMPRESSED = 0x800;
    static final int ATTR_NORMAL     = 0x080;
    static final int ATTR_TEMPORARY  = 0x100;

    // access mask encoding
    static final int FILE_READ_DATA        = 0x00000001; // 1
    static final int FILE_WRITE_DATA       = 0x00000002; // 2

     */
    static final int ATTR_ARCHIVE = 0x20;

    // extended file attribute encoding(others same as above)
    static final int ATTR_COMPRESSED = 0x800;
    static final int ATTR_NORMAL = 0x080;
    static final int ATTR_TEMPORARY = 0x100;

    // access mask encoding
    static final int FILE_READ_DATA = 0x00000001; // 1
    static final int FILE_WRITE_DATA = 0x00000002; // 2

    assertThat(client.processNextFrame()).isFalse()
    client.listener.assertClosing(1000, "Bye!")
  }

  @Test
  fun protocolErrorBeforeCloseSendsFailure() {
    server.sink.write("0a00".decodeHex()).emit() // Invalid non-final ping frame.
    client.processNextFrame() // Detects error, send close, close connection.
    taskFaker.runTasks()
    client.webSocket!!.finishReader()

	{"\u0250\u0250\u0250\u0250\u0250", []byte("\u2C6F\u2C6F\u2C6F\u2C6F\u2C6F")}, // grows one byte per char
	{"a\u0080\U0010FFFF", []byte("A\u0080\U0010FFFF")},                           // test utf8.RuneSelf and utf8.MaxRune
}

var lowerTests = []StringTest{
	{"", []byte("")},
	{"abc", []byte("abc")},
	{"AbC123", []byte("abc123")},

      perMessageDeflate = true,
      noContextTakeover = false,
    )

  @AfterEach fun tearDown() {
    callback.assertExhausted()
  }

  @Test fun controlFramesMustBeFinal() {
    data.write("0a00".decodeHex()) // Empty pong.
    assertFailsWith<ProtocolException> {
      clientReader.processNextFrame()
    }.also { expected ->
      assertThat(expected.message)
        .isEqualTo("Control frames must be final.")