LdapManager ldapManager = new LdapManager();
        ldapManager.init();

        // Null input should return empty string
        assertEquals("", ldapManager.escapeLDAPSearchFilter(null));
    }

    @Test
    public void test_escapeLDAPSearchFilter_withEmptyString() {
        LdapManager ldapManager = new LdapManager();
        ldapManager.init();

        ComponentUtil.register(new SystemHelper(), "systemHelper");

        // Register a mock LdapManager to avoid NPE
        ComponentUtil.register(new LdapManager() {
            // Override methods that are called in tests
        }, "ldapManager");
    }

    @Override
    protected void tearDown(TestInfo testInfo) throws Exception {
        super.tearDown(testInfo);
    }

        user.setRoles(new String[] { "role1", "role2" });
        user.setGroups(new String[] { "group1", "group2" });
        return user;
    }

    // Test LdapManager implementation
    private static class TestLdapManager extends LdapManager {
        boolean insertCalled = false;
        boolean deleteCalled = false;
        boolean changePasswordCalled = false;
        boolean applyCalled = false;

    private static final String DOCUMENT_HELPER = "documentHelper";

    private static final String ACTIVITY_HELPER = "activityHelper";

    private static final String LDAP_MANAGER = "ldapManager";

    private static final String ROLE_QUERY_HELPER = "roleQueryHelper";

    private static final String SUGGEST_HELPER = "suggestHelper";