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CLEAN-CODE-PRINCIPLES4 MIN READ

Place the test at the right height

Classify tests by the test pyramid so refactoring feedback stays close to the behavior.

Sort each test by the level where it belongs. Focused unit or policy test Integration or service test End-to-end smoke Implementation-coupled test to avoid Given line items and currency, invoice totals round to the expected cents A cancelled subscription is not eligible for auto-renewal The invoice repository persists tax fields and reads them back A signed payment webhook creates one renewal event in the database A user can complete checkout and see the confirmation page A high-value enterprise renewal works through the full browser path A private helper named tmp2 is called exactly three times The service calls private method…

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