protected void list() {
        List<String> vplsNames = vpls.getAllVpls().stream()
                .map(VplsData::name)
                .collect(Collectors.toList());
        Collections.sort(vplsNames);

        vplsNames.forEach(vpls -> {
            print(vpls);
        });
    }
@Test
    public void testList() {
        ((TestVpls) vplsCommand.vpls).initSampleData();
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        PrintStream ps = new PrintStream(baos);
        System.setOut(ps);
        vplsCommand.command = VplsCommandEnum.LIST.toString();
        vplsCommand.doExecute();
        String result = baos.toString();

        assertEquals(LIST_OUTPUT, result);
    }