2.1.2. Integrating Automated Testing into CI/CD Pipelines

What's the cost of shipping a bug to production? For a retail platform during peak hours, a single untested code change can cascade into lost revenue, customer trust erosion, and emergency rollbacks that consume your entire ops team for hours. Automated testing is the guardrail that prevents this — it validates every code change before it reaches production, catching defects when they're cheap to fix rather than expensive to remediate.

This section covers how to embed testing at every pipeline stage — unit tests for code logic, integration tests for service interactions, performance tests for scalability validation, and security scans for vulnerability detection. The exam heavily tests your ability to design testing strategies that balance thoroughness with pipeline speed.

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