[Edit] Add empty spec for mct-before-unload

Begin testing mct-before-unload directive, used to confirm navigation
away from unsaved changes, WTD-1035

platform/commonUI/edit/test/directives/MCTBeforeUnloadSpec.js

@@ -0,0 +1,23 @@
+/*global define,describe,it,expect,beforeEach,jasmine*/
+
+define(
+    ["../../src/directives/MCTBeforeUnload"],
+    function (MCTBeforeUnload) {
+        "use strict";
+
+        describe("The mct-before-unload directive", function () {
+            var mockWindow,
+                directive;
+
+            beforeEach(function () {
+                mockWindow = {};
+                directive = new MCTBeforeUnload(mockWindow);
+            });
+
+            it("can be used only as an attribute", function () {
+                expect(directive.restrict).toEqual('A');
+            });
+
+        });
+    }
+);