feat(test): qa_fill-tank

[xapg6acc]

No description provided.

[mateacademy-ai-mentor]

Review Summary

Your tests for fillTank clearly cover all the core business rules: correct handling of the optional amount parameter, proper mutation of only customer.money and customer.vehicle.fuelRemains, and returning undefined as required. You thoroughly verify behavior around tank capacity and customer money limits, including cases where requested fuel exceeds capacity and where money is the limiting factor [CHECKLIST ITEM #5, #6]. The rounding rules are well tested: poured volume is rounded down to one decimal, and the total price is rounded to the nearest hundredth, with edge cases included [CHECKLIST ITEM #7, #9]. You also correctly enforce the minimum 2L pour requirement, including scenarios where rounding or limits would drop the effective amount below 2L [CHECKLIST ITEM #8]. Jest assertions are used appropriately and the test structure is clear and readable [CHECKLIST ITEM #10, #13]. As a small, optional improvement, you could add a boundary test where the customer has exactly enough money for the maximum possible pour, or where the requested amount exactly matches remaining tank capacity, but these are not required for this task. Your solution is approved; you’ve met the functional and testing requirements well.

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