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Add a Vitest unit test suite (cart totals, invoice tax grouping, bundle contents)

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No test infrastructure existed in this repo yet. Covers the pure logic
most likely to silently produce wrong numbers on a live order: discount/
shipping math, per-rate invoice grouping, and bundle-contents string
building. Extracted describeBundleContents() out of the checkout route
into its own module so it's importable from a test (route.ts files only
allow HTTP-method exports).
This commit is contained in:
Marco
2026-07-22 11:40:31 +00:00
parent 91f6fef6ea
commit 51fee198f4
9 changed files with 1101 additions and 26 deletions
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app/api/checkout/route.ts
+2 -16
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@@ -4,25 +4,11 @@ import { getShippingMethods, getPaymentMethods, getCompanySettings } from "../..
import { validateDiscountCode, redeemDiscountCode } from "../../lib/discountServer";
import { createOrder } from "../../lib/orderServer";
import { getSessionCustomer, registerCustomer, setSessionCookie, type CustomerSummary } from "../../lib/customerAuth";
import { fetchProductsBySlug, type RawProduct } from "../../lib/productsServer";
import { fetchProductsBySlug } from "../../lib/productsServer";
import { describeBundleContents } from "../../lib/bundleContents";
import { sendCriticalAlert } from "../../lib/alertAdmin";
import { sendOrderConfirmationEmail } from "../../lib/orderEmail";
// A bundle's `bundleItems` is only ever resolved once, right here, into a
// plain readable string — the order line stores this snapshot
// (`items[].bundleContents`), not a structured sub-list, so a later change
// to the bundle's own composition can never rewrite what a past order
// actually contained. `product.bundleItems[].product` is a relationship
// resolved by fetchProductsBySlug's depth:2 fetch — {id, name} objects
// when populated, a bare id if depth somehow didn't reach it (skipped).
function describeBundleContents(product: RawProduct): string | null {
if (!product.bundleItems || product.bundleItems.length === 0) return null;
return product.bundleItems
.map((line) => (typeof line.product === "object" ? `${line.quantity}× ${line.product.name}` : null))
.filter((s): s is string => Boolean(s))
.join(", ");
}
type CheckoutBody = {
cart: CartItem[];
shippingMethodId: number;