CODING-FUNDAMENTALS5 MIN READ
Add a Feature Red-Green-Refactor
Use the TDD loop to add a small behavior in controlled steps.
Feature pressure Coupon expiration sounds like one condition, but the module already mixes region, plan, and first-purchase rules. A small change inside dense rules can break a neighboring behavior. TDD loop Red -> Green -> Refactor Use the test to define one behavior, the code to satisfy it, and refactoring to improve structure after proof. Code first fast but broad A feature slice with a guardrail One failing test is a scope boundary. R Red G Green RF Refactor Step 1 No test currently covers expired coupons.
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