assertTrue(action.isLogFilename("fess.log.gz"));
        assertTrue(action.isLogFilename("crawler.log.gz"));
    }

    @Test
    public void test_isLogFilename_invalidExtension() {
        final AdminMaintenanceAction action = new AdminMaintenanceAction();
        assertFalse(action.isLogFilename("fess.txt"));
        assertFalse(action.isLogFilename("fess.xml"));