evanflow-tdd
EvanFlow: TDD
Vocabulary
See evanflow meta-skill. Key terms: vertical slice, behavior through public interface, deep module.
Core Principle
Tests verify behavior through public interfaces, not implementation details. Code can change entirely; tests shouldn't break unless behavior changes.
Good test: "user can perform action X within their weekly rate limit" — describes capability.
Bad test: "calls createX() with status 'QUEUED' then queues a job" — describes mechanics. Renames break it.
Anti-Pattern: Horizontal Slices
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