export default function createCleanupBag() {
  // TODO: return { add, dispose, size }
  throw new Error('Not implemented');
}

import createCleanupBag from './createCleanupBag';

describe('createCleanupBag', () => {
  test('disposes remaining cleanups', () => {
    const bag = createCleanupBag();
    const calls = [];
    const offA = bag.add(() => calls.push('a'));
    bag.add(() => calls.push('b'));
    offA();

    bag.dispose();

    expect(calls).toEqual(['b']);
    expect(bag.size()).toBe(0);
  });

  test('dispose is idempotent', () => {
    const bag = createCleanupBag();
    let count = 0;
    bag.add(() => count++);
    bag.dispose();
    bag.dispose();
    expect(count).toBe(1);
  });

  test('add after dispose runs immediately', () => {
    const bag = createCleanupBag();
    let ran = 0;
    bag.dispose();
    bag.add(() => ran++);
    expect(ran).toBe(1);
    expect(bag.size()).toBe(0);
  });
});