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diff --git a/dom/media/webrtc/tests/mochitests/test_peerConnection_promiseSendOnly.html b/dom/media/webrtc/tests/mochitests/test_peerConnection_promiseSendOnly.html
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index 0000000000..a3fbb5753c
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+++ b/dom/media/webrtc/tests/mochitests/test_peerConnection_promiseSendOnly.html
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+<!DOCTYPE HTML>
+<html>
+<head>
+  <script type="application/javascript" src="pc.js"></script>
+</head>
+<body>
+<pre id="test">
+<script type="application/javascript">
+  createHTML({
+    bug: "1091898",
+    title: "PeerConnection with promises (sendonly)",
+    visible: true
+  });
+
+  var pc1 = new RTCPeerConnection();
+  var pc2 = new RTCPeerConnection();
+
+  var add = (pc, can, failed) => can && pc.addIceCandidate(can).catch(failed);
+  pc1.onicecandidate = e => add(pc2, e.candidate, generateErrorCallback());
+  pc2.onicecandidate = e => add(pc1, e.candidate, generateErrorCallback());
+
+  var v1, v2;
+  var delivered = new Promise(resolve => pc2.ontrack = e => {
+    // Test RTCTrackEvent here.
+    ok(e.streams.length, "has streams");
+    ok(e.streams[0].getTrackById(e.track.id), "has track");
+    ok(pc2.getReceivers().some(receiver => receiver == e.receiver), "has receiver");
+    if (e.streams[0].getTracks().length == 2) {
+      // Test RTCTrackEvent required args here.
+      mustThrowWith("RTCTrackEvent wo/required args",
+                    "TypeError", () => new RTCTrackEvent("track", {}));
+      v2.srcObject = e.streams[0];
+      resolve();
+    }
+  });
+
+  runNetworkTest(function() {
+    v1 = createMediaElement('video', 'v1');
+    v2 = createMediaElement('video', 'v2');
+    var canPlayThrough = new Promise(resolve => v2.canplaythrough = e => resolve());
+
+    is(v2.currentTime, 0, "v2.currentTime is zero at outset");
+
+    return navigator.mediaDevices.getUserMedia({ video: true, audio: true })
+    .then(stream => (v1.srcObject = stream).getTracks().forEach(t => pc1.addTrack(t, stream)))
+    .then(() => pc1.createOffer({})) // check that createOffer accepts arg.
+    .then(offer => pc1.setLocalDescription(offer))
+    .then(() => pc2.setRemoteDescription(pc1.localDescription))
+    .then(() => pc2.createAnswer({}))  // check that createAnswer accepts arg.
+    .then(answer => pc2.setLocalDescription(answer))
+    .then(() => pc1.setRemoteDescription(pc2.localDescription))
+    .then(() => delivered)
+//    .then(() => canPlayThrough)    // why doesn't this fire?
+    .then(() => waitUntil(() => v2.currentTime > 0))
+    .then(() => ok(v2.currentTime > 0, "v2.currentTime is moving (" + v2.currentTime + ")"))
+    .then(() => ok(true, "Connected."));
+  });
+</script>
+</pre>
+</body>
+</html>