test: add unit tests for fillTank#322
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Review Summary
Your solution is approved. The test file correctly implements all 6 required test cases covering the full range of functionality including default full tank behavior, max capacity limits, money constraints, floor rounding to the nearest tenth for fuel amounts, cancellation for amounts below 2 liters, and proper rounding to the nearest hundredth for pricing. All expected values have been mathematically verified and are correct. The test structure is clean and well-organized, using proper Jest syntax throughout. Great work on ensuring comprehensive coverage of edge cases like running out of money mid-refuel and handling amounts that would result in cancellation.
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