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diff --git a/dom/media/tests/mochitest/test_peerConnection_bug827843.html b/dom/media/tests/mochitest/test_peerConnection_bug827843.html
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+++ b/dom/media/tests/mochitest/test_peerConnection_bug827843.html
@@ -0,0 +1,70 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+ <script type="application/javascript" src="pc.js"></script>
+</head>
+<body>
+<pre id="test">
+<script type="application/javascript">
+ createHTML({
+ bug: "827843",
+ title: "Ensure that localDescription and remoteDescription are null after close"
+ });
+
+var steps = [
+ function CHECK_SDP_ON_CLOSED_PC(test) {
+ var description;
+ var exception = null;
+
+ // handle the event which the close() triggers
+ var localClosed = new Promise(resolve => {
+ test.pcLocal.onsignalingstatechange = e => {
+ is(e.target.signalingState, "closed",
+ "Received expected onsignalingstatechange event on 'closed'");
+ resolve();
+ }
+ });
+
+ test.pcLocal.close();
+
+ try { description = test.pcLocal.localDescription; } catch (e) { exception = e; }
+ ok(exception, "Attempt to access localDescription of pcLocal after close throws exception");
+ exception = null;
+
+ try { description = test.pcLocal.remoteDescription; } catch (e) { exception = e; }
+ ok(exception, "Attempt to access remoteDescription of pcLocal after close throws exception");
+ exception = null;
+
+ // handle the event which the close() triggers
+ var remoteClosed = new Promise(resolve => {
+ test.pcRemote.onsignalingstatechange = e => {
+ is(e.target.signalingState, "closed",
+ "Received expected onsignalingstatechange event on 'closed'");
+ resolve();
+ }
+ });
+
+ test.pcRemote.close();
+
+ try { description = test.pcRemote.localDescription; } catch (e) { exception = e; }
+ ok(exception, "Attempt to access localDescription of pcRemote after close throws exception");
+ exception = null;
+
+ try { description = test.pcRemote.remoteDescription; } catch (e) { exception = e; }
+ ok(exception, "Attempt to access remoteDescription of pcRemote after close throws exception");
+
+ return Promise.all([localClosed, remoteClosed]);
+ }
+];
+
+var test;
+runNetworkTest(() => {
+ test = new PeerConnectionTest();
+ test.setMediaConstraints([{audio: true}], [{audio: true}]);
+ test.chain.append(steps);
+ test.run();
+});
+</script>
+</pre>
+</body>
+</html>