[About] Add tests for controllers

Add tests for controllers introduced to support a minimal
implementation of an About dialog, WTD-667.

platform/commonUI/about/test/LogoControllerSpec.js

@@ -0,0 +1,32 @@
+/*global define,Promise,describe,it,expect,beforeEach,waitsFor,jasmine*/
+
+define(
+    ['../src/LogoController'],
+    function (LogoController) {
+        "use strict";
+
+        describe("The About controller", function () {
+            var mockOverlayService,
+                controller;
+
+            beforeEach(function () {
+                mockOverlayService = jasmine.createSpyObj(
+                    "overlayService",
+                    ["createOverlay"]
+                );
+                controller = new LogoController(mockOverlayService);
+            });
+
+            it("shows the about dialog", function () {
+                //Verify precondition
+                expect(mockOverlayService.createOverlay)
+                    .not.toHaveBeenCalled();
+                controller.showAboutDialog();
+                expect(mockOverlayService.createOverlay)
+                    .toHaveBeenCalledWith("overlay-about");
+            });
+
+        });
+
+    }
+);