docs: protected Assertion buildCasAssertion(final String principal,
                                            final RegisteredService registeredService,
                                            final Map<String, Object> attributes) {
          val p = new AttributePrincipalImpl(principal, attributes);
          return new AssertionImpl(p, DateTimeUtils.dateOf(ZonedDateTime.now(ZoneOffset.UTC)),
              null, DateTimeUtils.dateOf(ZonedDateTime.now(ZoneOffset.UTC)), attributes);
      }