import Payment from '../src/types/payment' let payment = new Payment("test-reference", "pay@abc.xyz"); test('Payment Type Instantiation', () => { expect(payment).toBeInstanceOf(Payment); }); test('Cart Instatiation on Payment Type', () =>{ expect(payment.items).toBeDefined(); }) test('If you can add items to the the cart', () => { let initialCartLength = payment.items.length(); payment.add("Test Item", 10, 1); let cartLength = payment.items.length(); expect(initialCartLength).toBeLessThan(cartLength); })