// Test when only baseDn is set
        ComponentUtil.setFessConfig(new FessConfig.SimpleImpl() {
            @Override
            public String getLdapBaseDn() {
                return "dc=example,dc=com";
            }

            @Override
            public String getLdapAccountFilter() {
                return "";
            }
        });

        existingProps.setProperty("ldap.security.principal", "cn=%s,dc=example,dc=com");

        // Normal username
        assertEquals("cn=admin,dc=example,dc=com", fessConfig.getLdapSecurityPrincipal("admin"));

        // Asterisk injection attempt
        assertEquals("cn=admin\\2a,dc=example,dc=com", fessConfig.getLdapSecurityPrincipal("admin*"));

        // Parentheses injection attempt

        // Blank groupName should return empty
        OptionalEntity<String> result = ldapManager.getSAMAccountGroupName("dc=example,dc=com", "");
        assertFalse(result.isPresent());

        result = ldapManager.getSAMAccountGroupName("dc=example,dc=com", "   ");
        assertFalse(result.isPresent());
    }

    @Test
    public void test_changePassword_withNullUsername() {

# Base DN for LDAP admin user.
ldap.admin.user.base.dn=ou\=People,dc\=fess,dc\=codelibs,dc\=org
# Object classes for LDAP admin user.
ldap.admin.user.object.classes=organizationalPerson,top,person,inetOrgPerson
# Role filter for LDAP admin.
ldap.admin.role.filter=cn\=%s
# Base DN for LDAP admin role.
ldap.admin.role.base.dn=ou\=Role,dc\=fess,dc\=codelibs,dc\=org
# Object classes for LDAP admin role.

            defaultMap.put(FessConfig.LDAP_ADMIN_USER_BASE_DN, "ou=People,dc=fess,dc=codelibs,dc=org");
            defaultMap.put(FessConfig.LDAP_ADMIN_USER_OBJECT_CLASSES, "organizationalPerson,top,person,inetOrgPerson");
            defaultMap.put(FessConfig.LDAP_ADMIN_ROLE_FILTER, "cn=%s");
            defaultMap.put(FessConfig.LDAP_ADMIN_ROLE_BASE_DN, "ou=Role,dc=fess,dc=codelibs,dc=org");

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