houseplan-card/test/command-stack.test.mjs

import test from 'node:test';
import assert from 'node:assert/strict';
import { CommandStack } from '../test-build/command-stack.js';

test('keeps fifty named commands and drops the oldest', () => {
  const stack = new CommandStack(50);
  for (let i = 0; i < 55; i++) stack.push({ name: `step ${i}`, before: i, after: i + 1 });
  assert.equal(stack.size, 50);
  assert.equal(stack.undoName, 'step 54');
  for (let i = 54; i >= 5; i--) assert.equal(stack.undo()?.name, `step ${i}`);
  assert.equal(stack.canUndo, false);
});

test('undo and redo preserve names and a new branch clears redo', () => {
  const stack = new CommandStack(50);
  stack.push({ name: 'Resize room', before: { x: 0 }, after: { x: 1 } });
  stack.push({ name: 'Add opening', before: { x: 1 }, after: { x: 2 } });
  assert.equal(stack.undo()?.name, 'Add opening');
  assert.equal(stack.redoName, 'Add opening');
  assert.equal(stack.redo()?.name, 'Add opening');
  assert.equal(stack.undo()?.name, 'Add opening');
  stack.push({ name: 'Split room', before: { x: 1 }, after: { x: 3 } });
  assert.equal(stack.canRedo, false);
  assert.equal(stack.undoName, 'Split room');
});

test('the configured history cannot be weakened below thirty commands', () => {
  const stack = new CommandStack(1);
  for (let i = 0; i < 35; i++) stack.push({ name: String(i), before: i, after: i + 1 });
  assert.equal(stack.size, 30);
});

test('selective invalidation removes matching undo and redo without clearing neighbours', () => {
  const stack = new CommandStack(50);
  stack.push({ name: 'lamp', before: { deviceId: 'lamp' }, after: { deviceId: 'lamp' } });
  stack.push({ name: 'sensor', before: { deviceId: 'sensor' }, after: { deviceId: 'sensor' } });
  stack.push({ name: 'lock', before: { deviceId: 'lock' }, after: { deviceId: 'lock' } });
  assert.equal(stack.undo()?.name, 'lock');

  assert.equal(
    stack.removeWhere(({ before }) => before.deviceId === 'sensor'),
    1,
  );
  assert.equal(stack.undoName, 'lamp');
  assert.equal(stack.redoName, 'lock');
  assert.equal(stack.canUndo, true);
  assert.equal(stack.canRedo, true);

  assert.equal(stack.removeWhere(({ after }) => after.deviceId === 'lock'), 1);
  assert.equal(stack.canRedo, false);
  assert.equal(stack.undo()?.name, 'lamp');
});