Name: qa.testing.strategy
Author: NXT-ANH

Imported from NXT-ANH/my-project (.claude/skills/qa.testing.strategy/SKILL.md). Install upstream with npx skills add NXT-ANH/my-project --skill qa.testing.strategy. Copyright stays with the author (MIT).

QA — Testing strategy

Skill id: qa.testing.strategy

QA is not just writing tests; it's creating a "safety net" that allows for rapid, confident change.

Strategy Layers

Happy Path: Verify the most common successful flow (Integration priority).
Defensive (Edge Cases): Test nulls, empty strings, and malformed inputs.
Negative (Error Handling): Ensure the system fails gracefully with correct error codes.
Integrity (DB/API): Verify that side effects (DB writes, external calls) actually happen.

Iron Law — Test the Invisible

Never assume a side effect occurred just because a function returned true. You MUST verify the persistent state (e.g., query the DB, check the mock call count).

Excuse vs. Reality

Excuse	Reality
"I'm testing the logic, no need to check the DB."	The logic might be right, but the integration (the most common source of bugs) remains unproven.
"Integration tests are too slow for TDD."	Slow tests signal bad architecture. Modularize the system so slices can be tested independently.

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qa.testing.strategy

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