| 1 | // strip-reorder.mjs's drop rule: where a dragged slide lands, as the |
| 2 | // `after` a move_slide wants, and when a drop changes nothing. |
| 3 | import test from 'node:test' |
| 4 | import assert from 'node:assert/strict' |
| 5 | import { dropTarget, dropOp } from './strip-reorder.mjs' |
| 6 | |
| 7 | const ids = ['a', 'b', 'c', 'd'] |
| 8 | |
| 9 | test('dropTarget: before puts it ahead of the item, after behind it, null means first', () => { |
| 10 | assert.equal(dropTarget(ids, 'c', 'a', 'before'), null) |
| 11 | assert.equal(dropTarget(ids, 'c', 'a', 'after'), 'a') |
| 12 | assert.equal(dropTarget(ids, 'a', 'd', 'after'), 'd') |
| 13 | assert.equal(dropTarget(ids, 'a', 'd', 'before'), 'c') |
| 14 | assert.equal(dropTarget(ids, 'd', 'b', 'before'), 'a') |
| 15 | }) |
| 16 | |
| 17 | test('a drop that leaves the order as it is is no move', () => { |
| 18 | assert.equal(dropTarget(ids, 'a', 'a', 'before'), undefined) |
| 19 | assert.equal(dropTarget(ids, 'b', 'a', 'after'), undefined) |
| 20 | assert.equal(dropTarget(ids, 'b', 'c', 'before'), undefined) |
| 21 | assert.equal(dropTarget(ids, 'a', 'b', 'before'), undefined) |
| 22 | assert.equal(dropTarget(ids, 'a', 'zz', 'before'), undefined) |
| 23 | assert.equal(dropOp(ids, 'b', 'a', 'after'), null) |
| 24 | }) |
| 25 | |
| 26 | test('dropOp is the move_slide', () => { |
| 27 | assert.deepEqual(dropOp(ids, 'c', 'a', 'before'), { op: 'move_slide', id: 'c' }) |
| 28 | assert.deepEqual(dropOp(ids, 'a', 'c', 'after'), { op: 'move_slide', id: 'a', after: 'c' }) |
| 29 | }) |
| 30 | |
amadan