[Browse] Add spec for SplitPaneController

Add unit test for controller which supports the moveable
splitter in Browse mode, WTD-747.

platform/commonUI/general/test/controllers/SplitPaneControllerSpec.js

@@ -0,0 +1,46 @@
+/*global define,Promise,describe,it,expect,beforeEach,waitsFor,jasmine*/
+
+define(
+    ["../../src/controllers/SplitPaneController"],
+    function (SplitPaneController) {
+        "use strict";
+
+        describe("The split pane controller", function () {
+            var controller;
+
+            beforeEach(function () {
+                controller = new SplitPaneController();
+            });
+
+            it("has an initial position", function () {
+                expect(controller.state() > 0).toBeTruthy();
+            });
+
+            it("can be moved", function () {
+                var initialState = controller.state();
+                controller.startMove();
+                controller.move(50);
+                expect(controller.state()).toEqual(initialState + 50);
+            });
+
+            it("clamps its position", function () {
+                var initialState = controller.state();
+                controller.startMove();
+                // Move some really extreme number
+                controller.move(-100000);
+                // Shouldn't have moved below 0...
+                expect(controller.state() > 0).toBeTruthy();
+                // ...but should have moved left somewhere
+                expect(controller.state() < initialState).toBeTruthy();
+
+                // Then do the same to the right
+                controller.move(100000);
+                // Shouldn't have moved below 0...
+                expect(controller.state() < 100000).toBeTruthy();
+                // ...but should have moved left somewhere
+                expect(controller.state() > initialState).toBeTruthy();
+            });
+
+        });
+    }
+);

platform/commonUI/general/test/suite.json

@@ -4,6 +4,7 @@
     "controllers/ClickAwayController",
     "controllers/ContextMenuController",
     "controllers/GetterSetterController",
+    "controllers/SplitPaneController",
     "controllers/ToggleController",
     "controllers/TreeNodeController",
     "controllers/ViewSwitcherController",