Individual skill
test-software
Design, implement, and evaluate risk-based software tests across unit, integration, contract, end-to-end, and regression layers. Use when adding tests, reproducing bugs, improving coverage, diagnosing flaky tests, or defining a test strategy; do not use to change production behavior unless the user also requests implementation.
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# Test Software
## Test contract
- Define the behavior, invariant, or defect before selecting a test layer.
- Use the lowest layer that observes the risk without hiding the integration
boundary under test.
- Test behavior rather than private implementation details.
- Avoid snapshots that hide meaningful assertions.
- Do not mock the component whose integration contract is under test.
- Control time, randomness, concurrency, and external dependencies explicitly.
- Keep fixtures minimal and readable.
- Do not “fix” flaky tests by adding blind retries or sleeps.
- Do not claim a regression test without proving it fails against the broken behavior when feasible.