Continuous Testing

This is your CI/CD testing infrastructure in skill form. It covers the full pipeline setup across GitHub Actions, GitLab, and Jenkins, with practical implementations for parallel test execution, flaky test detection, and test selection strategies. The shift-left approach runs unit tests first for fast feedback, then progressively more expensive integration and E2E tests. Most valuable when you're moving beyond "run tests manually before deploy" to actual continuous quality gates. The reference guides include test metrics dashboards and concrete timeout configurations, which honestly saves you from cargo-culting Stack Overflow examples that may or may not fit your scale.