diff --git a/dom/media/tests/mochitest/Makefile.in b/dom/media/tests/mochitest/Makefile.in
index e13971ed1ac..76ab887273d 100644
--- a/dom/media/tests/mochitest/Makefile.in
+++ b/dom/media/tests/mochitest/Makefile.in
@@ -30,6 +30,9 @@ MOCHITEST_FILES = \
   test_peerConnection_basicAudioVideoCombined.html \
   test_peerConnection_basicVideo.html \
   test_peerConnection_errorCallbacks.html \
+  test_peerConnection_offerRequiresReceiveAudio.html \
+  test_peerConnection_offerRequiresReceiveVideo.html \
+  test_peerConnection_offerRequiresReceiveVideoAudio.html \
   test_peerConnection_bug822674.html \
   test_peerConnection_bug825703.html \
   test_peerConnection_bug827843.html \
diff --git a/dom/media/tests/mochitest/pc.js b/dom/media/tests/mochitest/pc.js
index 73611e7e3c8..254362500e2 100644
--- a/dom/media/tests/mochitest/pc.js
+++ b/dom/media/tests/mochitest/pc.js
@@ -359,6 +359,16 @@ function PCT_setMediaConstraints(constraintsLocal, constraintsRemote) {
   this.pcRemote.constraints = constraintsRemote;
 };
 
+/**
+ * Sets the media constraints used on a createOffer call in the test.
+ *
+ * @param {object} constraints the media constraints to use on createOffer
+ */
+PeerConnectionTest.prototype.setOfferConstraints =
+function PCT_setOfferConstraints(constraints) {
+  this.pcLocal.offerConstraints = constraints;
+};
+
 /**
  * Start running the tests as assigned to the command chain.
  */
@@ -399,6 +409,7 @@ function PeerConnectionWrapper(label, configuration) {
   this.label = label;
 
   this.constraints = [ ];
+  this.offerConstraints = {};
   this.streams = [ ];
 
   info("Creating new PeerConnectionWrapper: " + this.label);
@@ -525,7 +536,7 @@ PeerConnectionWrapper.prototype = {
       info("Got offer: " + JSON.stringify(offer));
       self._last_offer = offer;
       onSuccess(offer);
-    }, unexpectedCallbackAndFinish);
+    }, unexpectedCallbackAndFinish, this.offerConstraints);
   },
 
   /**
diff --git a/dom/media/tests/mochitest/test_peerConnection_offerRequiresReceiveAudio.html b/dom/media/tests/mochitest/test_peerConnection_offerRequiresReceiveAudio.html
new file mode 100644
index 00000000000..f9cda2fbbff
--- /dev/null
+++ b/dom/media/tests/mochitest/test_peerConnection_offerRequiresReceiveAudio.html
@@ -0,0 +1,25 @@
+﻿<!DOCTYPE HTML>
+<html>
+<head>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+  <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="application/javascript" src="head.js"></script>
+  <script type="application/javascript" src="pc.js"></script>
+</head>
+<body>
+<pre id="test">
+<script type="application/javascript">
+  createHTML({
+    bug: "850275",
+    title: "Simple offer media constraint test with audio"
+  });
+
+  runTest(function() {
+    var test = new PeerConnectionTest();
+    test.setOfferConstraints({ mandatory: { OfferToReceiveAudio: true } });
+    test.run();
+  }, true);
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/media/tests/mochitest/test_peerConnection_offerRequiresReceiveVideo.html b/dom/media/tests/mochitest/test_peerConnection_offerRequiresReceiveVideo.html
new file mode 100644
index 00000000000..f734b318d01
--- /dev/null
+++ b/dom/media/tests/mochitest/test_peerConnection_offerRequiresReceiveVideo.html
@@ -0,0 +1,25 @@
+﻿<!DOCTYPE HTML>
+<html>
+<head>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+  <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="application/javascript" src="head.js"></script>
+  <script type="application/javascript" src="pc.js"></script>
+</head>
+<body>
+<pre id="test">
+<script type="application/javascript">
+  createHTML({
+    bug: "850275",
+    title: "Simple offer media constraint test with video"
+  });
+
+  runTest(function() {
+    var test = new PeerConnectionTest();
+    test.setOfferConstraints({ mandatory: { OfferToReceiveVideo: true } });
+    test.run();
+  }, true);
+</script>
+</pre>
+</body>
+</html>
diff --git a/dom/media/tests/mochitest/test_peerConnection_offerRequiresReceiveVideoAudio.html b/dom/media/tests/mochitest/test_peerConnection_offerRequiresReceiveVideoAudio.html
new file mode 100644
index 00000000000..6b50c27d50c
--- /dev/null
+++ b/dom/media/tests/mochitest/test_peerConnection_offerRequiresReceiveVideoAudio.html
@@ -0,0 +1,28 @@
+﻿<!DOCTYPE HTML>
+<html>
+<head>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+  <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="application/javascript" src="head.js"></script>
+  <script type="application/javascript" src="pc.js"></script>
+</head>
+<body>
+<pre id="test">
+<script type="application/javascript">
+  createHTML({
+    bug: "850275",
+    title: "Simple offer media constraint test with video/audio"
+  });
+
+  runTest(function() {
+    var test = new PeerConnectionTest();
+    test.setOfferConstraints({ mandatory: {
+      OfferToReceiveVideo: true,
+      OfferToReceiveAudio: true
+    }});
+    test.run();
+  }, true);
+</script>
+</pre>
+</body>
+</html>
