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diff --git a/dom/media/webrtc/tests/mochitests/test_getUserMedia_peerIdentity.html b/dom/media/webrtc/tests/mochitests/test_getUserMedia_peerIdentity.html
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index 0000000000..2c964e2f89
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+++ b/dom/media/webrtc/tests/mochitests/test_getUserMedia_peerIdentity.html
@@ -0,0 +1,61 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <script type="application/javascript" src="mediaStreamPlayback.js"></script>
+  <script type="application/javascript" src="blacksilence.js"></script>
+</head>
+<body>
+<pre id="test">
+<script type="application/javascript">
+createHTML({
+  title: "Test getUserMedia peerIdentity Constraint",
+  bug: "942367"
+});
+async function theTest() {
+  async function testPeerIdentityConstraint(withConstraint) {
+    const config = { audio: true, video: true };
+    if (withConstraint) {
+      config.peerIdentity = 'user@example.com';
+    }
+    info('getting media with constraints: ' + JSON.stringify(config));
+    const stream = await getUserMedia(config);
+    for (const track of stream.getTracks()) {
+      const recorder = new MediaRecorder(new MediaStream([track]));
+      try {
+        recorder.start();
+        ok(!withConstraint,
+          `gUM ${track.kind} track without peerIdentity must not throw`);
+        recorder.stop();
+      } catch(e) {
+        ok(withConstraint,
+          `gUM ${track.kind} track with peerIdentity must throw`);
+      }
+    }
+    await Promise.all([
+      audioIsSilence(withConstraint, stream),
+      videoIsBlack(withConstraint, stream),
+    ]);
+    stream.getTracks().forEach(t => t.stop());
+  };
+
+  // Start a tone so that the gUM call will record something even
+  // with --use-test-media-devices.
+  const audioContext = new AudioContext();
+  const tone = new LoopbackTone(audioContext, TEST_AUDIO_FREQ);
+  tone.start();
+
+  try {
+    // both without and with the constraint
+    await testPeerIdentityConstraint(false);
+    await testPeerIdentityConstraint(true);
+  } finally {
+    tone.stop();
+  }
+}
+
+runTest(theTest);
+
+</script>
+</pre>
+</body>
+</html>