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<html>
<head>
<meta charset="utf-8" />
<title>window.performance.memory in shared workers</title>
<script src="/w3c/resources/testharness.js"></script>
<script src="/w3c/resources/testharnessreport.js"></script>
<link rel="stylesheet" href="/w3c/resources/testharness.css" />
<script>

var tests = [
  '"performance" in self;',
  '"memory" in self.performance;',
  ('JSON.stringify(' +
   '{jsHeapSizeLimit: self.performance.memory.jsHeapSizeLimit,' +
   ' totalJSHeapSize: self.performance.memory.totalJSHeapSize,' +
   ' usedJSHeapSize: self.performance.memory.usedJSHeapSize});')
];

var t = async_test('window.performance.memory in shared workers');
t.step(function() {

    var worker = new SharedWorker("/w3c/webperf/resources/worker.js");
    worker.port.postMessage(tests);

    worker.port.onmessage = t.step_func(function(event) {
        var results = event.data;
        assert_equals(results.length, 3);
        assert_true(results[0], "self.performance is defined");
        assert_true(results[1], "self.performance.memory is defined");
        var jsHeap = JSON.parse(results[2]);
        assert_greater_than_equal(jsHeap.jsHeapSizeLimit, jsHeap.totalJSHeapSize, "jsHeapSizeLimit should be no less than totalJSHeapSize", {});
        assert_greater_than_equal(jsHeap.totalJSHeapSize, jsHeap.usedJSHeapSize, "totalJSHeapSize should be no less than usedJSHeapSize", {});
        worker.port.postMessage(["close();"]);
        t.done();
    });
});

</script>
</head>
<body>
<h1>Description</h1>
<p>This test validates that performance.memory exists in shared workers.</p>

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

</body>
</html>