@Test public void test() { ch.qos.logback.classic.Logger root = (ch.qos.logback.classic.Logger) LoggerFactory.getLogger(ch.qos.logback.classic.Logger.ROOT_LOGGER_NAME); @SuppressWarnings("unchecked") final Appender<ILoggingEvent> mockAppender = mock(Appender.class); when(mockAppender.getName()).thenReturn("MOCK"); root.addAppender(mockAppender); // 何かしらのログを出力する処理 verify(mockAppender).doAppend(argT