Developer recommends test gate to prevent silent bugs in discount code refactoring

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A software developer proposes using five recorded test rows as a 'refactor gate' when modifying discount calculation code. This approach aims to prevent unintended changes to financial totals that could otherwise pass undetected through standard tests. The method isolates arithmetic logic from environment reads, dictionary mutations, and print statements during code cleanup. It specifically guards against silent shifts in calculations caused by integer floor division and other formula changes. The proposal emphasizes separating bug fixes from refactoring to maintain clear code review boundaries.

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