def test_invoice_voids_self_if_cart_is_invalid(self):
current_cart = TestingCartController.for_user(self.USER_1)
# Should be able to create an invoice after the product is added
current_cart.add_to_cart(self.PROD_1, 1)
invoice_1 = TestingInvoiceController.for_cart(current_cart.cart)
self.assertFalse(invoice_1.invoice.is_void)
# Adding item to cart should produce a new invoice
current_cart.add_to_cart(self.PROD_2, 1)
invoice_2 = TestingInvoiceController.for_cart(current_cart.cart)
self.assertNotEqual(invoice_1.invoice, invoice_2.invoice)
# Viewing invoice_1's invoice should show it as void
invoice_1_new = TestingInvoiceController(invoice_1.invoice)
self.assertTrue(invoice_1_new.invoice.is_void)
# Viewing invoice_2's invoice should *not* show it as void
invoice_2_new = TestingInvoiceController(invoice_2.invoice)
self.assertFalse(invoice_2_new.invoice.is_void)
