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4.4Key Takeaways
- A test suite that takes too long to run is a test suite that nobody runs — speed determines utility
- Implement tiered execution: smoke on every commit, PR-scoped tests on PRs, full regression nightly
- Use test tagging and impact-based selection to run only relevant tests
- Treat PR diffs, failure logs, and tickets as selection signals — run the smallest set of tests that covers the risk a change introduces
- CI integration needs three properties: speed (parallelize, cache, fail-fast), information (actionable artifacts), trust (flaky rate < 1%)
- Post test results directly to PRs — developers should not have to hunt for results