public String doLayout(ILoggingEvent event) {
    if (!isStarted()) {
      return CoreConstants.EMPTY_STRING;
    }
    return writeLoopOnConverters(event);
  }
@Test
  public void cnTest() {
    pl.setPattern("%cn");
    lc.setName("aValue");
    pl.start();
    String val = pl.doLayout(getEventObject());
    assertEquals("aValue", val);
  }