@uppy/utils/lib/delay.test.js

Shared utility functions for Uppy Core and plugins maintained by the Uppy team.

import { describe, expect, it } from 'vitest';
import { AbortController } from './AbortController.js';
import delay from './delay.js';
describe('delay', () => {
    it('should wait for the specified time', async () => {
        const start = Date.now();
        await delay(100);
        // 100 is less of a rule, more of a guideline
        // according to CI
        expect(Date.now() - start).toBeGreaterThanOrEqual(90);
    });
    it('should reject if signal is already aborted', async () => {
        const signal = { aborted: true };
        const start = Date.now();
        await expect(delay(100, { signal })).rejects.toHaveProperty('name', 'AbortError');
        // should really be instant but using a very large range in case CI decides
        // to be super busy and block the event loop for a while.
        expect(Date.now() - start).toBeLessThan(50);
    });
    it('should reject when signal is aborted', async () => {
        const controller = new AbortController();
        const start = Date.now();
        const testDelay = delay(1000, { signal: controller.signal });
        await Promise.all([
            delay(50).then(() => controller.abort()),
            expect(testDelay).rejects.toHaveProperty('name', 'AbortError'),
        ]);
        // should have rejected before the timer is done
        const time = Date.now() - start;
        expect(time).toBeGreaterThanOrEqual(30);
        expect(time).toBeLessThan(900);
    });
});