@Test
public void testAppend() throws Exception {

    DubboAppender appender = new DubboAppender();
    appender.append(event);
    assertThat(DubboAppender.logList, hasSize(0));
    DubboAppender.doStart();
    appender.append(event);
    assertThat(DubboAppender.logList, hasSize(1));
    Log log = DubboAppender.logList.get(0);
    assertThat(log.getLogThread(), equalTo("thread-name"));
}