Checkout Flow Test Cases — Template with 70+ Scenarios

2026-07-17 · By Avinash Kamble, reviewed by Priyanka G.

Checkout is where money lives. It's also where the most subtle bugs hide — tax rounding, race conditions, PSP retries. Use this template as a baseline for any e-commerce release.

1. Cart mutations (add/update/remove).
2. Address forms (locale-aware).
3. Shipping method selection.
4. Discount codes (stacking, expiry, one-per-customer).
5. Tax calculation (state/VAT, digital vs physical).
6. Payment (card, wallet, BNPL, 3DS).
7. Order confirmation & email.
8. Failure modes (declined, timeout, retry).
9. Edge cases (0-value order, out-of-stock during checkout).

0.01 unit price × 100 qty
99.99 subtotal × 20% VAT
Multiple discounts stacked
Currency: JPY (no decimals), KWD (3 decimals)
Rounding: half-up vs banker's

3DS challenge success / failure
Card decline (insufficient funds)
Card expired
PSP timeout → retry idempotency
Duplicate submit (double-click)
Refund flow

The AI Test Case Generator ships a "Checkout" preset with all 70+ scenarios ready to export.