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https://github.com/web-platform-tests/wpt
26 December 2018, 22:31:15 UTC
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Tip revision: ffd8b73499f6099fb269344d81208743d1b9f54c authored by Hallvord R. M. Steen on 25 February 2016, 15:23:24 UTC
Reordering asserts to make failures easier to debug
Tip revision: ffd8b73
send-sync-blocks-async.htm 
<!DOCTYPE html>
<html>
<head>
    <!-- This behaviour is not explicitly spelled out in the spec.
    It does say "queue tasks" under the "if the synchronous flag is unset" header in point 10 of the "send" algorithm.. -->
    <link rel="help" href="https://xhr.spec.whatwg.org/#the-send()-method" data-tested-assertations="following-sibling::ol/li[10]/dl/dd/dl/dd[2]/p[3]" />
    <script src="/resources/testharness.js"></script>
    <script src="/resources/testharnessreport.js"></script>
    <title>XMLHttpRequest: sync requests should block events on pending async requests</title>
</head>

<body>
    <div id="log"></div>

    <script type="text/javascript">
        var test = async_test();

        var expect = ['sync 4', 'async 2', 'async 3', 'async 4']
        var actual = []

        test.step(function()
        {
            var xhr_async = new XMLHttpRequest()
            xhr_async.open('GET', 'resources/delay.py?ms=1000', true) // first launch an async request, completes in 1 second
            xhr_async.onreadystatechange = function()
            {
                test.step(function()
                {
                     actual.push('async ' + xhr_async.readyState)
                     if(xhr_async.readyState === 4 && actual.indexOf('sync 4')>-1){
                        VerifyResult()
                    }

                });
            };
            xhr_async.send()

            setTimeout(function(){
                var xhr_sync = new XMLHttpRequest();
                xhr_sync.open('GET', 'resources/delay.py?ms=2000', false) // here's a sync request that will take 2 seconds to finish
                xhr_sync.onreadystatechange = function()
                {
                    test.step(function()
                    {
                         actual.push('sync ' + xhr_sync.readyState)
                         if(xhr_sync.readyState === 4 && actual.indexOf('async 4')>-1){
                            VerifyResult()
                        }
                    });
                };
                xhr_sync.send()

            }, 10);

            function VerifyResult()
            {
                test.step(function()
                {
                    assert_array_equals(actual, expect);
                    test.done();
                });
            };
        });
    </script>
</body>
</html>
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