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  <title>2.7 Safe passing of structured data</title>
  <link rel="help" href="https://html.spec.whatwg.org/multipage/#safe-passing-of-structured-data" />
  <script src="/resources/testharness.js"></script>
  <script src="/resources/testharnessreport.js"></script>
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<script type="text/javascript">
    // Note, this test is designed to be in a similar style to
    // html/infrastructure/safe-passing-of-structured-data/structuredclone_0.html
    // It is in a separate file to avoid causing a syntax error on UAs which
    // do not yet support BigInt, so the rest of the test can continue running.

    var worker;
    var testCollection;
    setup(function()
    {
        //the worker is used for each test in sequence
        //worker's callback will be set for each test
        //worker's internal onmessage echoes the data back to this thread through postMessage
        worker = new Worker("./resources/echo-worker.js");
        testCollection = [
            function() {
                var t = async_test("Primitive BigInt is cloned");
                t.id = 0;
                worker.onmessage = t.step_func(function(e) {assert_equals(1n, e.data, "1n === event.data"); t.done(); });
                t.step(function() { worker.postMessage(1n);});
            },
            function() {
                var t = async_test("Instance of BigInt is cloned");
                t.id = 1;
                var obj;
                t.step(function() {obj = Object(1n);});
                worker.onmessage = t.step_func(function(e) {
                    assert_equals(obj.constructor, e.data.constructor, "BigInt === event.data.constructor");
                    assert_equals(obj.valueOf(), e.data.valueOf(), "(BigInt(1n)).valueOf() === event.data.valueOf()");
                    t.done();
                });
                t.step(function() { worker.postMessage(obj);});
            },
        ];
    }, {explicit_done:true});

    //Callback for result_callback
    //queues the next test in the array testCollection
    //serves to make test execution sequential from the async worker callbacks
    //alternatively, we would have to create a worker for each test
    function testFinished(test) {
        if(test.id < testCollection.length - 1) {
            //queue the function so that stack remains shallow
            queue(testCollection[test.id+1]);
        } else {
            //when the last test has run, explicitly end test suite
            done();
        }
    }
    function queue(func) {
        step_timeout(func, 10);
    }

    add_result_callback(testFinished);
    //start the first test manually
    queue(testCollection[0]);


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