Time: 0:00
Test a custom input to verify an edge case (e.g. empty lists, negative numbers, duplicates).
This bug belongs to the logic errors pattern
The wrong operator, an inverted condition, a formula the right way round but backwards.
What went wrong: or is True if either condition is True. A full cart alone is enough to pass, even with no payment.
The fix: return cart_total > 0 and has_valid_payment
Remember: "both must be true" means and. "At least one" means or.
The pattern behind it: logic errors.
Paste this into any web page or blog post. Visitors fix the bug right there, in their browser.
<iframe src="https://trybughunt.com/embed/2396121a-491e-4a74-93f1-5d0ada68a3cb" title="Debugging challenge: Checkout works without a valid payment" width="100%" height="580" loading="lazy" style="border:1px solid #d4d4d8;border-radius:12px;max-width:760px"></iframe>
<p style="font-size:14px">Debugging challenge from <a href="https://trybughunt.com/challenges/2396121a-491e-4a74-93f1-5d0ada68a3cb">TryBugHunt</a></p>