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- describe('UndoManager Suite', function () {
- let undoManager, items;
- function addItem(item) {
- items.push(item);
- }
- function removeItem() {
- items.pop();
- }
- function addItemToUndo(item, groupId) {
- undoManager.add({
- groupId,
- undo: function () {
- removeItem();
- },
- redo: function () {
- addItem(item);
- },
- });
- }
- beforeEach(function () {
- // Always start with a clean slate
- items = [];
- undoManager = new window.UndoManager();
- });
- it('Create the undo manager', function () {
- undoManager = new UndoManager();
- expect(undoManager).not.toBe(null);
- expect(undoManager.getCommands().length).toBe(0);
- expect(undoManager.getIndex()).toBe(-1);
- });
- it('Adding a command', function () {
- let item = 'A';
- addItem(item);
- addItemToUndo(item);
- expect(undoManager.getCommands().length).toBe(1);
- expect(undoManager.getIndex()).toBe(0);
- expect(undoManager.hasUndo()).toBe(true);
- expect(undoManager.hasRedo()).toBe(false);
- });
- it('Adding a callback', function () {
- let callbackCalled = 0;
- addItemToUndo('A');
- undoManager.setCallback(function () {
- callbackCalled++;
- });
- undoManager.undo();
- undoManager.redo();
- expect(callbackCalled).toBe(2);
- undoManager.setCallback(undefined);
- undoManager.undo();
- undoManager.redo();
- expect(callbackCalled).toBe(2);
- });
- it('Calling redo', function () {
- let item1 = 'A',
- item2 = 'B';
- addItem(item1);
- addItemToUndo(item1);
- addItem(item2);
- addItemToUndo(item2);
- undoManager.undo();
- undoManager.redo();
- expect(items.length).toBe(2);
- expect(undoManager.hasUndo()).toBe(true);
- expect(undoManager.getCommands().length).toBe(2);
- expect(undoManager.getIndex()).toBe(1);
- });
- it('Calling redo that is not a function', function () {
- let item1 = 'A',
- item2 = 'B';
- addItem(item1);
- undoManager.add({
- undo: function () {
- removeItem();
- },
- redo: undefined,
- });
- addItem(item2);
- undoManager.add({
- undo: function () {
- removeItem();
- },
- redo: undefined,
- });
- undoManager.undo();
- undoManager.redo();
- expect(items.length).toBe(1);
- expect(undoManager.hasUndo()).toBe(true);
- expect(undoManager.getCommands().length).toBe(2);
- expect(undoManager.getIndex()).toBe(1);
- });
- it('Calling undo without redo', function () {
- addItem('A');
- addItem('B');
- undoManager.add({
- undo: function () {
- removeItem();
- },
- redo: undefined,
- });
- undoManager.undo();
- undoManager.undo();
- expect(items.length).toBe(1);
- expect(undoManager.hasUndo()).toBe(false);
- expect(undoManager.getCommands().length).toBe(1);
- expect(undoManager.getIndex()).toBe(-1);
- });
- it('Calling clear', function () {
- addItemToUndo('A');
- addItemToUndo('B');
- undoManager.clear();
- expect(undoManager.getCommands().length).toBe(0);
- expect(undoManager.getIndex()).toBe(-1);
- expect(undoManager.hasUndo()).toBe(false);
- expect(undoManager.hasRedo()).toBe(false);
- });
- it('Calling undo with limit set', function () {
- undoManager.setLimit(5);
- addItem('1');
- addItemToUndo('1');
- addItem('2');
- addItemToUndo('2');
- addItem('3');
- addItemToUndo('3');
- addItem('4');
- addItemToUndo('4');
- addItem('5');
- addItemToUndo('5');
- addItem('6');
- addItemToUndo('6');
- addItem('7');
- addItemToUndo('7');
- undoManager.undo();
- undoManager.undo();
- undoManager.undo();
- undoManager.undo();
- undoManager.undo();
- expect(undoManager.hasUndo()).toBe(false);
- expect(undoManager.hasRedo()).toBe(true);
- expect(undoManager.getCommands().length).toBe(5);
- });
- it('Calling undo with limit set to 1', function () {
- undoManager.setLimit(1);
- let item1 = 'A',
- item2 = 'B',
- item3 = 'C';
- addItem(item1);
- addItemToUndo(item1);
- addItem(item2);
- addItemToUndo(item2);
- addItem(item3);
- addItemToUndo(item3);
- undoManager.undo();
- undoManager.undo();
- undoManager.undo();
- expect(undoManager.hasUndo()).toBe(false);
- expect(undoManager.hasRedo()).toBe(true);
- expect(undoManager.getCommands().length).toBe(1);
- });
- it('Calling undo with limit set to 0', function () {
- undoManager.setLimit(0);
- let item1 = 'A',
- item2 = 'B',
- item3 = 'C';
- addItem(item1);
- addItemToUndo(item1);
- addItem(item2);
- addItemToUndo(item2);
- addItem(item3);
- addItemToUndo(item3);
- undoManager.undo();
- undoManager.undo();
- expect(undoManager.hasUndo()).toBe(true);
- expect(undoManager.hasRedo()).toBe(true);
- expect(undoManager.getCommands().length).toBe(3);
- });
- it('Calling undo/redo/clear with group ID', function () {
- let groupId;
- addItem('A');
- addItemToUndo('A');
- addItem('B');
- addItemToUndo('B');
- groupId = 'CDE';
- addItem('C');
- addItemToUndo('C', groupId);
- addItem('D');
- addItemToUndo('D', groupId);
- addItem('E');
- addItemToUndo('E', groupId);
- addItem('F');
- addItemToUndo('F');
- // Undo
- expect(items.length).toBe(6);
- undoManager.undo();
- expect(items.length).toBe(5);
- undoManager.undo();
- expect(items.length).toBe(2);
- expect(undoManager.getCommands(groupId).length).toBe(3);
- // Redo
- undoManager.redo();
- expect(items.length).toBe(5);
- undoManager.redo();
- expect(items.length).toBe(6);
- // Clear
- undoManager.clear();
- expect(undoManager.getCommands(groupId).length).toBe(0);
- });
- });
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