public void test_InstanceInfo() {
        final InstanceInfo info = new InstanceInfo();
        info.instanceId = "node1@host1";
        info.hostname = "host1";
        info.name = "node1";
        info.lastSeen = 1000L;

        assertEquals("node1@host1", info.instanceId);
        assertEquals("host1", info.hostname);
        assertEquals("node1", info.name);
        assertEquals(1000L, info.lastSeen);
    }

        assertNotNull(result);
        assertFalse(result.isEmpty());
        assertTrue(result.hasMessageOf("testProperty"));
    }

    @Test
    public void test_addErrorsOperationAlreadyRunning_withDifferentHosts() {
        final FessMessages messages1 = new FessMessages();
        messages1.addErrorsOperationAlreadyRunning("prop", "host1");
        assertFalse(messages1.isEmpty());

            }
        });

        List<Path> fileList = systemHelper.refreshDesignJspFiles();
        assertEquals(0, fileList.size());

        virtualHostList.add(new Tuple3<>("abc.example.com", "8080", "host1"));
        fileList = systemHelper.refreshDesignJspFiles();
        assertEquals(0, fileList.size());

        systemHelper.addDesignJspFileName("xxx", "yyy.jsp");