| import { SourceHistory } from '$lib/utils'; |
| import { describe, expect, it } from 'vitest'; |
|
|
| describe('SourceHistory', () => { |
| it('coalesces pushes inside the group window into one undo step', () => { |
| const h = new SourceHistory(100, 800); |
|
|
| h.push({ caret: 0, value: '' }, 1000); |
| h.push({ caret: 1, value: 'a' }, 1200); |
| h.push({ caret: 2, value: 'ab' }, 1500); |
|
|
| expect(h.undo({ caret: 3, value: 'abc' })).toEqual({ caret: 0, value: '' }); |
| expect(h.undo({ caret: 0, value: '' })).toBeNull(); |
| }); |
|
|
| it('starts a new group once the window has passed', () => { |
| const h = new SourceHistory(100, 800); |
|
|
| h.push({ caret: 0, value: '' }, 1000); |
| h.push({ caret: 3, value: 'abc' }, 2000); |
|
|
| expect(h.undo({ caret: 6, value: 'abcdef' })).toEqual({ caret: 3, value: 'abc' }); |
| expect(h.undo({ caret: 3, value: 'abc' })).toEqual({ caret: 0, value: '' }); |
| }); |
|
|
| it('newGroup forces a separate entry even inside the window', () => { |
| const h = new SourceHistory(100, 800); |
|
|
| h.push({ caret: 0, value: '' }, 1000); |
| h.push({ caret: 3, value: 'abc' }, 1100, true); |
|
|
| expect(h.undo({ caret: 4, value: 'abc\n' })).toEqual({ caret: 3, value: 'abc' }); |
| expect(h.undo({ caret: 3, value: 'abc' })).toEqual({ caret: 0, value: '' }); |
| }); |
|
|
| it('redo round-trips and a fresh push clears the redo stack', () => { |
| const h = new SourceHistory(100, 800); |
|
|
| h.push({ caret: 0, value: '' }, 1000); |
|
|
| const undone = h.undo({ caret: 3, value: 'abc' }); |
|
|
| expect(undone).toEqual({ caret: 0, value: '' }); |
| expect(h.redo({ caret: 0, value: '' })).toEqual({ caret: 3, value: 'abc' }); |
|
|
| h.undo({ caret: 3, value: 'abc' }); |
| h.push({ caret: 0, value: '' }, 5000); |
| expect(h.redo({ caret: 1, value: 'x' })).toBeNull(); |
| }); |
|
|
| it('starts a new group on the first edit after an undo', () => { |
| const h = new SourceHistory(100, 800); |
|
|
| h.push({ caret: 0, value: '' }, 1000); |
| h.undo({ caret: 3, value: 'abc' }); |
|
|
| h.push({ caret: 0, value: '' }, 1200); |
| expect(h.undo({ caret: 1, value: 'x' })).toEqual({ caret: 0, value: '' }); |
| }); |
|
|
| it('evicts the oldest entry past the limit', () => { |
| const h = new SourceHistory(2, 800); |
|
|
| h.push({ caret: 0, value: 'one' }, 1000); |
| h.push({ caret: 0, value: 'two' }, 2000); |
| h.push({ caret: 0, value: 'three' }, 3000); |
|
|
| expect(h.undo({ caret: 0, value: 'cur' })).toEqual({ caret: 0, value: 'three' }); |
| expect(h.undo({ caret: 0, value: 'three' })).toEqual({ caret: 0, value: 'two' }); |
| expect(h.undo({ caret: 0, value: 'two' })).toBeNull(); |
| }); |
| }); |
|
|
