Toju/toju-app/src/app/domains/attachment/domain/logic/attachment-autodownload-concurrency.rules.spec.ts

import { runTasksWithBoundedConcurrency } from './attachment-autodownload-concurrency.rules';

describe('attachment-autodownload-concurrency.rules', () => {
  it('runs tasks with bounded concurrency', async () => {
    let active = 0;
    let maxActive = 0;

    const tasks = Array.from({ length: 6 }, (_, index) => async () => {
      active += 1;
      maxActive = Math.max(maxActive, active);
      await new Promise((resolve) => setTimeout(resolve, 5));
      active -= 1;

      return index;
    });
    const results = await runTasksWithBoundedConcurrency(tasks, 2);

    expect(results).toEqual([
      0,
      1,
      2,
      3,
      4,
      5
    ]);

    expect(maxActive).toBeLessThanOrEqual(2);
  });
});