Solution

[BadOfficer]

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[mateacademy-ai-mentor]

Review Summary

Your solution is approved because the fillTank implementation correctly follows all specified rules: it fills to full when amount is omitted, never exceeds the free tank capacity, respects the customer’s available money, discards fuel fractions beyond the tenth of a liter, enforces the 2 L minimum pour, and rounds the charged price to the nearest cent, with tests covering each of these behaviors. The code is clear and well-structured, with small helper functions for rounding that make the logic easy to follow and maintain. To strengthen your test suite further, you could add an explicit expectation that fillTank returns undefined, since the requirement says the function should not return a value. Another valuable improvement would be a test that snapshots the customer object before calling fillTank and then asserts that only money and vehicle.fuelRemains change, confirming there are no unintended side effects. You might also consider adding a test for a case where a specific amount is passed that is less than the tank’s free space and fully affordable, to demonstrate that partial explicit orders are handled as expected. Overall, the current implementation and tests meet the task’s functional requirements, and the suggested additions would just make your tests more comprehensive and robust.

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