import { createDefer } from '../../src/create-defer'; describe('createDefer', () => { it('should resolve with given value', async () => { const defer = createDefer(); defer.resolve(42); const result = await defer.promise(); expect(result).toBe(42); }); it('should reject with given reason', async () => { const defer = createDefer(); defer.reject('error'); await expect(defer.promise()).rejects.toEqual('error'); }); });