### Question:
XMLChannel extends BaseChannel { protected void sendMessageHeader(ISOMsg m, int len) { } XMLChannel();  XMLChannel(String host, int port, ISOPackager p);  XMLChannel(ISOPackager p);  XMLChannel(ISOPackager p, ServerSocket serverSocket); void disconnect();  }### Answer:
@Test public void testSendMessageHeader() throws Throwable { XMLChannel xMLChannel = new XMLChannel(null, new ServerSocket()); xMLChannel.sendMessageHeader(new ISOMsg("testXMLChannelMti"), 100); assertEquals(0, xMLChannel.getHeaderLength(), "xMLChannel.getHeaderLength()"); }