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Catch bugs on the pull request before they reach production.

Cofactor runs your regression suite in the pipeline you already have. If something breaks, the pull request shows the failing step and a video before anyone merges it.

Why bugs are found late.

The full suite runs after merge

It’s too slow or too flaky to block a merge, so it runs overnight. By the time anyone looks, the bug is already in main.

Someone else has to fix it

By the time a bug is found, the person who wrote the change has moved on. Someone else has to work out what caused it.

Customers find the rest

Anything the suite misses before release gets found by your users.

issues.northwind.io/ENG-2214
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ENG-2214TodoBug

Expired promo code leaves the order total unchanged

What happened

Applying an expired promo code at checkout shows the success banner and leaves the order total unchanged, so the cart and the total disagree. The customer can place the order at the undiscounted price while the page says the code was applied.

Steps to reproduce
  1. Sign in as a returning customer with a saved card.
  2. Add any item to the cart and open checkout.
  3. Apply promo code SPRING24, expired 2026-06-30.
  4. Read the banner, then read the order total.
EvidenceRun video · 0:42TraceNetwork log
Prompt for your coding agentCopy
Fix ENG-2214 in the storefront checkout.

When a promo code has expired, applyPromo() returns { ok: false, reason: 'expired' },
but PromoBanner still renders the success state and OrderSummary does not recalculate
the total. The cart and the total disagree.

Reproduce from the recorded trace: cofactor test-suite steps checkout-promo 8f21c4
Make the banner reflect the rejection and keep the total authoritative.

Cofactor re-runs the Checkout suite on your PR and comments the result.
StatusTodo
PriorityHigh
Assignee
Priya Raman
Labels
regressioncheckoutbilling
ProjectCheckout hardening
Filed by
Cofactor
from CF-3391 · 8h ago
Todo

Expired promo code leaves the order total unchanged

ENG-2214 Checkout hardening
PriorityHigh
AssigneePriya Raman
Run video · 0:42TraceNetwork log

What changes.

You hear about a bug while the change is still fresh in someone’s mind.

One command in your pipeline

Add one command and an API token to whichever CI you use. It returns an exit code you can block merges on.

The pull request tells you what broke

Cofactor leaves one comment on the pull request and keeps it up to date. It shows the failing step and a video of it.

The fix is ready to start

Every bug is filed in Jira, Linear or Azure DevOps with a prompt your coding agent can pick up.

As an engineering leader, you're constantly weighing coverage against velocity. Cofactor is one of the few tools that's genuinely given us both. It's been a force multiplier for the team.
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Where to start.

Catch it before it merges.

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