Код-ревью: тесты, которые написал ИИ

import { applyPromo } from './promo';
import * as rules from './rules';

jest.mock('./rules');

describe('applyPromo', () => {
  it('applies promo', () => {
    (rules.discountFor as jest.Mock).mockReturnValue(10);
    const cart = { total: 100, items: [{ id: 1, price: 100 }] };
    const result = applyPromo(cart, 'SALE10');
    expect(result).toBeDefined();
  });

  it('calculates total', () => {
    const cart = { total: 200, items: [{ id: 1, price: 200 }] };
    const expected = applyPromo(cart, 'SALE10').total;
    expect(applyPromo(cart, 'SALE10').total).toBe(expected);
  });

  it('works', () => {
    const result = applyPromo({ total: 50, items: [] }, 'SALE10');
    expect(result.total).toBeTruthy();
  });
});