diff -r 000000000000 -r 6474c204b198 webapprt/test/chrome/browser_getUserMedia.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/webapprt/test/chrome/browser_getUserMedia.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,42 @@
+Cu.import("resource://gre/modules/Services.jsm");
+
+function test() {
+  waitForExplicitFinish();
+
+  Services.prefs.setBoolPref("media.navigator.permission.fake", true);
+
+  let getUserMediaDialogOpened = false;
+
+  let winObserver = function(win, topic) {
+    if (topic == "domwindowopened") {
+      win.addEventListener("load", function onLoadWindow() {
+        win.removeEventListener("load", onLoadWindow, false);
+
+        if (win.document.documentURI == "chrome://webapprt/content/getUserMediaDialog.xul") {
+          getUserMediaDialogOpened = true;
+          win.close();
+        }
+      }, false);
+    }
+  }
+
+  Services.ww.registerNotification(winObserver);
+
+  let mutObserver = null;
+
+  loadWebapp("getUserMedia.webapp", undefined, function onLoad() {
+    let msg = gAppBrowser.contentDocument.getElementById("msg");
+    mutObserver = new MutationObserver(function(mutations) {
+      is(msg.textContent, "PERMISSION_DENIED", "getUserMedia permission denied.");
+      ok(getUserMediaDialogOpened, "Prompt shown.");
+      finish();
+    });
+    mutObserver.observe(msg, { childList: true });
+  });
+
+  registerCleanupFunction(function() {
+    Services.ww.unregisterNotification(winObserver);
+    mutObserver.disconnect();
+    Services.prefs.clearUserPref("media.navigator.permission.fake");
+  });
+}