test_xrayed_arguments.js

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function run_test() {

  var sbContent = Cu.Sandbox(null);

  let xrayedArgs = sbContent.eval("(function(a, b) { return arguments; })('hi', 42)");

  function checkArgs(a) {

    Assert.equal(a.length, 2);

    Assert.equal(a[0], 'hi');

    Assert.equal(a[1], 42);

  // Check Xrays to the args.

  checkArgs(xrayedArgs);

  // Make sure the spread operator works.

  checkArgs([...xrayedArgs]);