LayoutTests/fast/events/message-port-context-destroyed.html - WebKit - Git at Google

 <script>
 if (window.testRunner) {
     testRunner.dumpAsText();
     testRunner.waitUntilDone();
 }

 var port;
 var gc_stuff = new Array();

 gc_and_crash = function() {
     if (this.GCController)
         GCController.collect();
     else {
         // V8 needs that many objects to run GC.
         for(i = 0; i < 100000; i++) {
             p = new Object();
             gc_stuff.push(p);
             gc_stuff.push(p + p);
         }
     }

     // If the bug 43140 is regressed, this will crash, at least in v8-based ports.
     port.start();

     document.getElementById("log").innerText = "PASS";
     if (window.testRunner)
         testRunner.notifyDone();
 }

 function test() {
     var iframe = document.getElementById("iframe");
     var channel = new iframe.contentWindow.MessageChannel();
     port = channel.port1;

     iframe.onload = function() { gc_and_crash(); }
     iframe.src = "data:text/html,<body>Hello!" ;
 }
 </script>
 <body onload="test()">
 <p>Test that MessagePort is properly closed when its owning context goes away. The test succeeds if it doesn't crash and prints "PASS" below. See https://bugs.webkit.org/show_bug.cgi?id=43140 for more details.</p>
 <pre id=log></pre>
 <iframe style="display:none" id=iframe></iframe>
	<script>
	if (window.testRunner) {
	testRunner.dumpAsText();
	testRunner.waitUntilDone();
	}

	var port;
	var gc_stuff = new Array();

	gc_and_crash = function() {
	if (this.GCController)
	GCController.collect();
	else {
	// V8 needs that many objects to run GC.
	for(i = 0; i < 100000; i++) {
	p = new Object();
	gc_stuff.push(p);
	gc_stuff.push(p + p);
	}
	}

	// If the bug 43140 is regressed, this will crash, at least in v8-based ports.
	port.start();

	document.getElementById("log").innerText = "PASS";
	if (window.testRunner)
	testRunner.notifyDone();
	}

	function test() {
	var iframe = document.getElementById("iframe");
	var channel = new iframe.contentWindow.MessageChannel();
	port = channel.port1;

	iframe.onload = function() { gc_and_crash(); }
	iframe.src = "data:text/html,<body>Hello!" ;
	}
	</script>
	<body onload="test()">
	<p>Test that MessagePort is properly closed when its owning context goes away. The test succeeds if it doesn't crash and prints "PASS" below. See https://bugs.webkit.org/show_bug.cgi?id=43140 for more details.</p>
	<pre id=log></pre>
	<iframe style="display:none" id=iframe></iframe>