ThreadContext.remove("key1");
ThreadContext.remove("key2");
root.error("finished mdc pattern test", new NullPointerException("test"));
appender.stop();
final List<String> list = appender.getMessages();
assertTrue("Incorrect number of lines. Require at least 85 " + list.size(), list.size() > 85);
assertTrue("Incorrect header", list.get(3).equals("<title>Log4J Log Messages</title>"));
assertTrue("Incorrect footer", list.get(list.size() - 1).equals("</body></html>"));