serverWriter.writeMessageFrame(OPCODE_TEXT, payload)
    assertData("8105")
    assertData(payload)
  }

  @Test fun serverLargeBufferedPayloadWrittenAsOneFrame() {
    val length = 12345
    val payload: ByteString = (binaryData(length))
    serverWriter.writeMessageFrame(OPCODE_TEXT, payload)
    assertData("817e")
    assertData(format("%04x", length))
    assertData(payload)
  }

  ): Boolean {
    try {
      source.require(9) // Frame header size.
    } catch (e: EOFException) {
      return false // This might be a normal socket close.
    }

    //  0                   1                   2                   3
    //  0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
    // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
    // |                 Length (24)                   |

0122          ; mapped                 ; 0123          # 1.1  LATIN CAPITAL LETTER G WITH CEDILLA
0123          ; valid                                  # 1.1  LATIN SMALL LETTER G WITH CEDILLA
0124          ; mapped                 ; 0125          # 1.1  LATIN CAPITAL LETTER H WITH CIRCUMFLEX
0125          ; valid                                  # 1.1  LATIN SMALL LETTER H WITH CIRCUMFLEX