Run some tests under karma

Including a regression test for
https://github.com/vector-im/vector-web/issues/1314

test/test-utils.js

@@ -0,0 +1,24 @@
+"use strict";
+
+var q = require('q');
+
+/**
+ * Perform common actions before each test case, e.g. printing the test case
+ * name to stdout.
+ * @param {Mocha.Context} context  The test context
+ */
+module.exports.beforeEach = function(context) {
+    var desc = context.currentTest.fullTitle();
+    console.log();
+    console.log(desc);
+    console.log(new Array(1 + desc.length).join("="));
+};
+
+/**
+ * returns true if the current environment supports webrtc
+ */
+module.exports.browserSupportsWebRTC = function() {
+    var n = global.window.navigator;
+    return n.getUserMedia || n.webkitGetUserMedia ||
+        n.mozGetUserMedia;
+};