private RegexRegisteredService mockPrincipalService(
      final String provider, final String attrName, final String attrValue) {
    final RegexRegisteredService service = mockService(provider);
    final DefaultRegisteredServiceMultifactorPolicy policy =
        (DefaultRegisteredServiceMultifactorPolicy) service.getMultifactorPolicy();
    policy.setPrincipalAttributeNameTrigger(attrName);
    policy.setPrincipalAttributeValueToMatch(attrValue);

    return service;
  }