Daniel@0: "use strict";
Daniel@0: 
Daniel@0: describe("ContextModule.StateHistory", function() {
Daniel@0: 
Daniel@0:     it("is promptly created", function() {
Daniel@0:         var testedStateHistory = new App.ContextModule.StateHistory();
Daniel@0:         
Daniel@0:         expect(testedStateHistory).not.toBe(null);
Daniel@0:         expect(testedStateHistory.get("maxStackSize")).toEqual(50);
Daniel@0:         expect(testedStateHistory.get("currentSerializedState")).toEqual(undefined);
Daniel@0:         expect(testedStateHistory.get("compoundChangeDetector")).toEqual(undefined);
Daniel@0:     });
Daniel@0:     
Daniel@0:     it("is promptly created with attributes", function() {
Daniel@0:         var testedStateHistory = new App.ContextModule.StateHistory({
Daniel@0:             maxStackSize: 40,
Daniel@0:             currentSerializedState: 42,
Daniel@0:             compoundChangeDetector: function() {}
Daniel@0:         });
Daniel@0:         
Daniel@0:         expect(testedStateHistory).not.toBe(null);
Daniel@0:         expect(testedStateHistory.get("maxStackSize")).toEqual(40);
Daniel@0:         expect(testedStateHistory.get("currentSerializedState")).toEqual(42);
Daniel@0:         expect(typeof testedStateHistory.get("compoundChangeDetector")).toEqual("function");
Daniel@0:     });
Daniel@0: 
Daniel@0:     it("undoes and redoes", function() {
Daniel@0:         var testedStateHistory = new App.ContextModule.StateHistory({
Daniel@0:             currentSerializedState: {"a": 42},
Daniel@0:         });
Daniel@0:         expect(testedStateHistory.canUndo()).toBe(false);
Daniel@0:         expect(testedStateHistory.canRedo()).toBe(false);
Daniel@0: 
Daniel@0:         testedStateHistory.set("currentSerializedState", {"a": 42});
Daniel@0:         expect(testedStateHistory.get("currentSerializedState")).toEqual({"a": 42});
Daniel@0:         expect(testedStateHistory.canUndo()).toBe(false);
Daniel@0:         expect(testedStateHistory.canRedo()).toBe(false);
Daniel@0:         expect(function() {
Daniel@0:             testedStateHistory.undo();
Daniel@0:         }).toThrow();
Daniel@0:         expect(function() {
Daniel@0:             testedStateHistory.redo();
Daniel@0:         }).toThrow();
Daniel@0:         
Daniel@0:         testedStateHistory.set("currentSerializedState", {"a": 43, "b": 44});
Daniel@0:         expect(testedStateHistory.get("currentSerializedState")).toEqual({"a": 43, "b": 44});
Daniel@0:         expect(testedStateHistory.canUndo()).toBe(true);
Daniel@0:         expect(testedStateHistory.canRedo()).toBe(false);
Daniel@0:         
Daniel@0:         // The same object does not create a new state in the undo stack
Daniel@0:         testedStateHistory.set("currentSerializedState", {"a": 42});
Daniel@0:         expect(testedStateHistory.get("currentSerializedState")).toEqual({"a": 42});
Daniel@0:         expect(testedStateHistory.canUndo()).toBe(true);
Daniel@0:         expect(testedStateHistory.canRedo()).toBe(false);
Daniel@0:         
Daniel@0:         testedStateHistory.undo();
Daniel@0:         expect(testedStateHistory.get("currentSerializedState")).toEqual({"a": 43, "b": 44});
Daniel@0:         expect(testedStateHistory.canUndo()).toBe(true);
Daniel@0:         expect(testedStateHistory.canRedo()).toBe(true);
Daniel@0: 
Daniel@0:         testedStateHistory.undo();
Daniel@0:         expect(testedStateHistory.get("currentSerializedState")).toEqual({"a": 42});
Daniel@0:         expect(testedStateHistory.canUndo()).toBe(false);
Daniel@0:         expect(testedStateHistory.canRedo()).toBe(true);
Daniel@0:         
Daniel@0:         expect(function() {
Daniel@0:             testedStateHistory.undo();
Daniel@0:         }).toThrow();
Daniel@0:         
Daniel@0:         testedStateHistory.redo();
Daniel@0:         expect(testedStateHistory.get("currentSerializedState")).toEqual({"a": 43, "b": 44});
Daniel@0:         expect(testedStateHistory.canUndo()).toBe(true);
Daniel@0:         expect(testedStateHistory.canRedo()).toBe(true);
Daniel@0: 
Daniel@0:         testedStateHistory.redo();
Daniel@0:         expect(testedStateHistory.get("currentSerializedState")).toEqual({"a": 42});
Daniel@0:         expect(testedStateHistory.canUndo()).toBe(true);
Daniel@0:         expect(testedStateHistory.canRedo()).toBe(false);
Daniel@0:         
Daniel@0:         testedStateHistory.undo();
Daniel@0:         expect(testedStateHistory.get("currentSerializedState")).toEqual({"a": 43, "b": 44});
Daniel@0:         
Daniel@0:         // In current implementation redo stack is wasted even
Daniel@0:         // if the new state is exactly the same as the first element there 
Daniel@0:         testedStateHistory.set("currentSerializedState", {"a": 42});
Daniel@0:         expect(testedStateHistory.get("currentSerializedState")).toEqual({"a": 42});
Daniel@0:         expect(testedStateHistory.canUndo()).toBe(true);
Daniel@0:         expect(testedStateHistory.canRedo()).toBe(false);
Daniel@0: 
Daniel@0:     });
Daniel@0:     it("resets", function() {
Daniel@0:         var testedStateHistory = new App.ContextModule.StateHistory({
Daniel@0:             currentSerializedState: {"a": 42},
Daniel@0:         });
Daniel@0:         testedStateHistory.set("currentSerializedState", {"a": 43, "b": 44});
Daniel@0:         testedStateHistory.set("currentSerializedState", {"a": 43, "b": 45});
Daniel@0:         
Daniel@0:         testedStateHistory.undo();
Daniel@0:         expect(testedStateHistory.canUndo()).toBe(true);
Daniel@0:         expect(testedStateHistory.canRedo()).toBe(true);
Daniel@0: 
Daniel@0:         testedStateHistory.reset();
Daniel@0:         
Daniel@0:         expect(testedStateHistory.canUndo()).toBe(false);
Daniel@0:         expect(testedStateHistory.canRedo()).toBe(false);
Daniel@0:         
Daniel@0:     });
Daniel@0: 
Daniel@0:     it("trims undo and redo stacks", function() {
Daniel@0:         var testedStateHistory = new App.ContextModule.StateHistory({
Daniel@0:             maxStackSize: 10,
Daniel@0:         });
Daniel@0:         for (var i = 20; i >= 0; --i) {
Daniel@0:             testedStateHistory.set("currentSerializedState", {"x": i});
Daniel@0:         }
Daniel@0:         for (var i = 1; i <= 10; i++) {
Daniel@0:             testedStateHistory.undo();
Daniel@0:             expect(testedStateHistory.get("currentSerializedState")).toEqual({"x": i});
Daniel@0:         }
Daniel@0:         expect(testedStateHistory.canUndo()).toBe(false);
Daniel@0:         expect(testedStateHistory.canRedo()).toBe(true);
Daniel@0:         expect(testedStateHistory.get("currentSerializedState")).toEqual({"x": 10});
Daniel@0: 
Daniel@0:         testedStateHistory.set("maxStackSize", 5);
Daniel@0:         for (var i = 9; i >= 5; --i) {
Daniel@0:             testedStateHistory.redo();
Daniel@0:             expect(testedStateHistory.get("currentSerializedState")).toEqual({"x": i});
Daniel@0:         }
Daniel@0: 
Daniel@0:         expect(testedStateHistory.canUndo()).toBe(true);
Daniel@0:         expect(testedStateHistory.canRedo()).toBe(false);
Daniel@0: 
Daniel@0:         testedStateHistory.set("maxStackSize", 1);
Daniel@0:         testedStateHistory.undo();
Daniel@0:         expect(testedStateHistory.canUndo()).toBe(false);
Daniel@0:         testedStateHistory.redo();
Daniel@0:         expect(testedStateHistory.canRedo()).toBe(false);
Daniel@0:         
Daniel@0:         testedStateHistory.set("maxStackSize", 3);
Daniel@0:         testedStateHistory.set("currentSerializedState", {"x": 100});
Daniel@0:         testedStateHistory.set("currentSerializedState", {"x": 200});
Daniel@0:         testedStateHistory.set("currentSerializedState", {"x": 300});
Daniel@0:         testedStateHistory.undo();
Daniel@0:         testedStateHistory.undo();
Daniel@0:         testedStateHistory.undo();
Daniel@0:         expect(testedStateHistory.canUndo()).toBe(false);
Daniel@0:     });
Daniel@0:     
Daniel@0:     it("triggers change:currentSerializedState when needed", function() {
Daniel@0:         var spyNames = [
Daniel@0:                 "change",
Daniel@0:                 "change:currentSerializedState",
Daniel@0:             ];
Daniel@0:         var spy = jasmine.createSpyObj("listener", spyNames);
Daniel@0:         var expectSpyCallCount = function() {
Daniel@0:             _.each(arguments, function(arg, i) {
Daniel@0:                 //console.log("___", i, "--->", spy[spyNames[i]].calls.count(), arg);
Daniel@0:                 expect(spy[spyNames[i]].calls.count()).toEqual(arg);
Daniel@0:             });
Daniel@0:             for (var i = arguments.length; i < spyNames.length; i++) {
Daniel@0:                 expect(spy[spyNames[i]].calls.count()).toEqual(0);
Daniel@0:             }
Daniel@0:         };
Daniel@0:         var resetSpyCallCount = function() {
Daniel@0:             _.each(spyNames, function(spyName) {
Daniel@0:                 spy[spyName].calls.reset();
Daniel@0:             });
Daniel@0:         };
Daniel@0:         var expectSpyCallCountAndReset = function() {
Daniel@0:             expectSpyCallCount.apply(null, arguments);
Daniel@0:             resetSpyCallCount();
Daniel@0:         };
Daniel@0:         
Daniel@0:         var testedStateHistory = new App.ContextModule.StateHistory({
Daniel@0:             maxStackSize: 10,
Daniel@0:         });
Daniel@0: 
Daniel@0:         _.each(spyNames, function(spyName) {
Daniel@0:             testedStateHistory.on(spyName, spy[spyName]);
Daniel@0:         });
Daniel@0:         
Daniel@0:         testedStateHistory.set("currentSerializedState", {"test": true});
Daniel@0:         expectSpyCallCountAndReset(1, 1);
Daniel@0: 
Daniel@0:         testedStateHistory.set("currentSerializedState", {"test": true});
Daniel@0:         expectSpyCallCountAndReset(0, 0);
Daniel@0:         
Daniel@0:         testedStateHistory.set("currentSerializedState", {"test": false});
Daniel@0:         expectSpyCallCountAndReset(1, 1);
Daniel@0:         
Daniel@0:         testedStateHistory.undo();
Daniel@0:         testedStateHistory.undo();
Daniel@0:         expectSpyCallCountAndReset(2, 2);
Daniel@0: 
Daniel@0:         testedStateHistory.redo();
Daniel@0:         testedStateHistory.redo();
Daniel@0:         expectSpyCallCountAndReset(2, 2);
Daniel@0:         
Daniel@0:         testedStateHistory.undo();
Daniel@0:         expectSpyCallCountAndReset(1, 1);
Daniel@0:         
Daniel@0:         testedStateHistory.set("currentSerializedState", {"test": true});
Daniel@0:         expectSpyCallCountAndReset(0, 0);
Daniel@0:         
Daniel@0:         testedStateHistory.reset();
Daniel@0:         expectSpyCallCountAndReset(1, 0);
Daniel@0:         testedStateHistory.reset();
Daniel@0:         expectSpyCallCountAndReset(0, 0);
Daniel@0: 
Daniel@0:     });
Daniel@0: });