assertArrayEquals(groups, user.getGroupNames());

        // Test with single group
        groups = new String[] { "users" };
        user = new TestFessUser("testuser", new String[] {}, groups, new String[] {});
        assertArrayEquals(groups, user.getGroupNames());

        // Test with empty groups
        groups = new String[] {};

    }

    public boolean hasGroup(final String group) {
        return stream(user.getGroupNames()).get(stream -> stream.anyMatch(s -> s.equals(group)));
    }

    public boolean hasGroups(final String[] acceptedGroups) {
        return stream(user.getGroupNames())
                .get(stream -> stream.anyMatch(s1 -> stream(acceptedGroups).get(s3 -> s3.anyMatch(s2 -> s2.equals(s1)))));
    }

     * @return Array of role names.
     */
    String[] getRoleNames();

    /**
     * Gets the user's assigned group names.
     * @return Array of group names.
     */
    String[] getGroupNames();

    /**
     * Gets the user's permissions.
     * @return Array of permission strings.
     */
    String[] getPermissions();

    /**
     * Determines if the user's information can be edited.

            return name;
        }

        @Override
        public String[] getRoleNames() {
            return roles;
        }

        @Override
        public String[] getGroupNames() {
            return groups;
        }

        @Override
        public String[] getPermissions() {
            if (permissions == null) {

                .map(s -> s.substring(1))
                .toArray(n -> new String[n]));
    }

    @Override
    public String[] getGroupNames() {
        final FessConfig fessConfig = ComponentUtil.getFessConfig();
        return stream(getPermissions()).get(stream -> stream.filter(s -> s.startsWith(fessConfig.getRoleSearchGroupPrefix()))

            public void permissionChanged(OptionalThing<FessUserBean> userBean) {
                // Do nothing
            }
        }, "activityHelper");

        String[] groupNames = ldapUser.getGroupNames();
        assertNotNull(groupNames);
        assertEquals(2, groupNames.length);
        assertEquals("group1", groupNames[0]);
        assertEquals("group2", groupNames[1]);
    }

        }

        @Override
        public String[] getRoleNames() {
            return roles;
        }

        @Override
        public String[] getGroupNames() {
            return groups;
        }

        @Override
        public String[] getPermissions() {
            if (permissions == null) {

            return roleNames;
        }

        public void setGroupNames(String[] groupNames) {
            this.groupNames = groupNames;
        }

        @Override
        public String[] getGroupNames() {
            return groupNames;
        }

        public void setPermissions(String[] permissions) {
            this.permissions = permissions;
        }

        @Override

            return nameId;
        }

        @Override
        public String[] getRoleNames() {
            return roles;
        }

        @Override
        public String[] getGroupNames() {
            return groups;
        }

        @Override
        public String[] getPermissions() {
            if (permissions == null) {

                            }
                        });
                        final List<String> newGroupList = stream(user.getGroupNames()).get(stream -> stream.collect(Collectors.toList()));
                        stream(user.getGroupNames()).of(stream -> stream.forEach(name -> {
                            if (oldGroupList.contains(name)) {
                                oldGroupList.remove(name);