payload.writeByte('0'.code)
    }
    serverWriter.writeMessageFrame(OPCODE_BINARY, payload.snapshot())

    // Write directly to the unbuffered sink. This ensures it will become single frame.
    assertData("827f") // 'f' == 16-byte follow-up length.
    assertData(format("%016X", payload.size))
    assertData(payload.readByteString())
  }

  @Test fun clientBinary() {
    val payload =
      (

2F7E          ; mapped                 ; 8012          # 3.0  KANGXI RADICAL PLOW
2F7F          ; mapped                 ; 8033          # 3.0  KANGXI RADICAL EAR
2F80          ; mapped                 ; 807F          # 3.0  KANGXI RADICAL BRUSH
2F81          ; mapped                 ; 8089          # 3.0  KANGXI RADICAL MEAT
2F82          ; mapped                 ; 81E3          # 3.0  KANGXI RADICAL MINISTER