The card below is the “product under test”. Use guided mode to see the bug list upfront, or blind mode to find them yourself first.
Techniques: API testing, Error guessing
Order #NZ-2094 — Summary
| Item | Qty | Unit price | Line total |
|---|---|---|---|
| Merino scarf | 2 | $45.00 | $85.00 |
| Wool blanket | 1 | $120.00 | $120.00 |
| Kiwi plush toy | 3 | $18.00 | $54.00 |
| Subtotal | $259.00 |
| Discount (10%) | -$30.00 |
| Shipping | $12.50 |
| Total | $244.35 |
Payment method: Visa ending 4242 • Status: Paid
Your findings
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Write down every bug you find. Be specific — where it is, what’s wrong, what it should be.
Planted bugs (5)
- The scarf line shows qty 2 × $45.00 = $85.00. The correct calculation is $90.00 — a $5 undercharge.
- $85 + $120 + $54 = $259, which matches the shown subtotal. But since the scarf line total is wrong ($85 instead of $90), the subtotal has silently inherited the error — it should be $264.00.
- The 10% discount is calculated as $30.00. 10% of the incorrect $259 subtotal = $25.90. Neither $30.00 nor $25.90 is consistent — the discount calculation is separately wrong.
- Working backwards: $259 - $30 + $12.50 = $241.50, not $244.35. The total doesn't match the shown components regardless of which values you use.
- NZ e-commerce orders should show GST (15%) as a line item. Its absence could be a compliance issue or a sign it's included but not disclosed.
Data integrity: verify every calculation manually. Sum line totals → compare to subtotal. Apply discount → compare. Add shipping → compare to total. One wrong number can cascade.