1 files changed, 34 insertions, 0 deletions
diff --git a/dom/media/webrtc/tests/mochitests/test_peerConnection_setLocalAnswerInHaveLocalOffer.html b/dom/media/webrtc/tests/mochitests/test_peerConnection_setLocalAnswerInHaveLocalOffer.html
new file mode 100644
index 0000000000..07cdd7d6bd
--- /dev/null
+++ b/dom/media/webrtc/tests/mochitests/test_peerConnection_setLocalAnswerInHaveLocalOffer.html
@@ -0,0 +1,34 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <script type="application/javascript" src="pc.js"></script>
+</head>
+<body>
+<pre id="test">
+<script type="application/javascript">
+  createHTML({
+    bug: "784519",
+    title: "setLocalDescription (answer) in 'have-local-offer'"
+  });
+
+runNetworkTest(function () {
+  const test = new PeerConnectionTest();
+  test.setMediaConstraints([{audio: true}], [{audio: true}]);
+  test.chain.removeAfter("PC_LOCAL_SET_LOCAL_DESCRIPTION");
+
+  test.chain.append([
+    function PC_LOCAL_SET_LOCAL_ANSWER(test) {
+      test.pcLocal._latest_offer.type = "answer";
+      return test.pcLocal.setLocalDescriptionAndFail(test.pcLocal._latest_offer)
+        .then(err => {
+          is(err.name, "InvalidModificationError", "Error is InvalidModificationError");
+        });
+    }
+  ]);
+
+  return test.run();
+});
+</script>
+</pre>
+</body>
+</html>