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diff --git a/dom/media/webrtc/tests/mochitests/test_peerConnection_insertDTMF.html b/dom/media/webrtc/tests/mochitests/test_peerConnection_insertDTMF.html
new file mode 100644
index 0000000000..ca8b866a6d
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+++ b/dom/media/webrtc/tests/mochitests/test_peerConnection_insertDTMF.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: "1291715",
+  title: "Test insertDTMF on sender",
+  visible: true
+});
+
+function insertdtmftest(pc) {
+  ok(pc.getSenders().length, "have senders");
+  var sender = pc.getSenders()[0];
+  ok(sender.dtmf, "sender has dtmf object");
+
+  ok(sender.dtmf.toneBuffer === "", "sender should start with empty tonebuffer");
+
+  // These will trigger assertions on debug builds if we do not enforce the
+  // specified minimums and maximums for duration and interToneGap.
+  sender.dtmf.insertDTMF("A", 10);
+  sender.dtmf.insertDTMF("A", 10000);
+  sender.dtmf.insertDTMF("A", 70, 10);
+
+  var threw = false;
+  try {
+    sender.dtmf.insertDTMF("bad tones");
+  } catch (ex) {
+    threw = true;
+    is(ex.code, DOMException.INVALID_CHARACTER_ERR, "Expected InvalidCharacterError");
+  }
+  ok(threw, "Expected exception");
+
+  sender.dtmf.insertDTMF("A");
+  sender.dtmf.insertDTMF("B");
+  ok(!sender.dtmf.toneBuffer.includes("A"), "calling insertDTMF should replace current characters");
+
+  sender.dtmf.insertDTMF("aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa");
+  ok(sender.dtmf.toneBuffer.includes("A"), "lowercase characters should be normalized");
+
+  pc.removeTrack(sender);
+  threw = false;
+  try {
+    sender.dtmf.insertDTMF("AAA");
+  } catch (ex) {
+    threw = true;
+    is(ex.code, DOMException.INVALID_STATE_ERR, "Expected InvalidStateError");
+  }
+  ok(threw, "Expected exception");
+}
+
+runNetworkTest(() => {
+  test = new PeerConnectionTest();
+  test.setMediaConstraints([{audio: true}], [{audio: true}]);
+  test.chain.removeAfter("PC_REMOTE_WAIT_FOR_MEDIA_FLOW");
+
+  // Test sender dtmf.
+  test.chain.append([
+    function PC_LOCAL_INSERT_DTMF(test) {
+      // We want to call removeTrack
+      test.pcLocal.expectNegotiationNeeded();
+      return insertdtmftest(test.pcLocal._pc);
+    }
+  ]);
+
+  return pushPrefs(['media.peerconnection.dtmf.enabled', true])
+    .then(() => test.run());
+});
+
+</script>
+</pre>
+</body>
+</html>