Testing Principles

Use when choosing, adding, reviewing, or reporting tests, fixtures, snapshots, manual smoke checks, or verification evidence.

Read

The core below is the required contract. When writing or meaningfully reviewing test code, also open common/skills/scenario-driven-testing/SKILL.md. Open references/current-guidance.md only for an unresolved in-scope question:

• ## Match Test To Boundary for which evidence fits a changed boundary.
• ## Stack Discovery For Tests for an unfamiliar test stack or UI state/form-factor coverage.
• ## Test File Organization for placement, splits, migrations, size budget.
• ### Optional Python unittest verification for the verify --test-pattern tests gate.
• ## Common Rationalizations, ## Red Flags when weighing whether evidence is enough.

Must