Integration testing SRE focuses on proving that systems work as intended when all parts connect. Unit tests confirm small pieces, but integration tests confirm the bridges between them. They run across APIs, databases, message queues, and external services. Failures here reveal the kind of problems that crash production.
For Site Reliability Engineering, integration tests are not optional. They are part of the reliability pipeline. A service might work alone but break when dependent services change. Integration testing finds these problems before users do. It is the guardrail for release confidence.
Strong integration testing for SRE means building tests that mimic real production traffic. Test in staging with production-like data and scale. Cover authentication flows, event-driven operations, and failover routines. Measure latency, throughput, and error rates. If a test fails, trace the logs across all connected services. Fix the gap, then re-run until stable.