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<!DOCTYPE HTML>
<html>
<head>
  <title>Bug 1450358 - Test EventSource event listener leak conditions</title>
  <script src="/tests/SimpleTest/SimpleTest.js"></script>
  <script type="text/javascript" src="/tests/dom/events/test/event_leak_utils.js"></script>
  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
</head>
<body>
<script class="testbody" type="text/javascript">
// Manipulate EventSource.  Its important here that we create a
// listener callback from the DOM objects back to the frame's global
// in order to exercise the leak condition.
async function useEventSource(contentWindow) {
  let es = new contentWindow.EventSource("delayedServerEvents.sjs");
  es.onmessage = _ => {
    contentWindow.messageCount += 1;
  };
}

async function runTest() {
  try {
    await checkForEventListenerLeaks("EventSource", useEventSource);
  } catch (e) {
    ok(false, e);
  } finally {
    SimpleTest.finish();
  }
}

SimpleTest.waitForExplicitFinish();
addEventListener("load", runTest, { once: true });
</script>
</pre>
</body>
</html>
