final Capture<Integer> intCapture = new Capture<Integer>();
final Capture<String> strCapture = new Capture<String>();
//write expectations
mockOs.writeByte(captureByte(byteCapture));
mockOs.writeInt(captureInt(intCapture));
mockOs.writeUTF(capture(strCapture));
replay(mockOs);
symbolTable.localNameSymbols.write(mockOs);