gecko-dev/js/xpconnect/tests/unit/test_bug1170311.js

function run_test() {
  do_check_throws_nsIException(() => Cu.getObjectPrincipal({}).equals(null), "NS_ERROR_ILLEGAL_VALUE");
  do_check_throws_nsIException(() => Cu.getObjectPrincipal({}).subsumes(null), "NS_ERROR_ILLEGAL_VALUE");
}