The dashboard lit up red after midnight. Integration tests had passed all day. Chaos testing broke them in under five minutes.
Integration testing tells you if your services work together under normal conditions. Chaos testing shows you if they still work when the world tilts. That moment when network latency spikes, a database node crashes, or an API times out—chaos testing exposes the weak links you thought you didn’t have.
Most teams stop at integration. They run a CI pipeline, prove the code works, and ship. But integration tests are like checking if a car runs on a sunny day. Chaos testing is driving it up a mountain in a storm. When you combine them, you get something stronger: proof that your entire system can survive the unexpected while still delivering the expected.
The real magic is not just testing happy paths or breakpoints in isolation. It’s stacking integration testing and chaos testing together, targeting both functionality and resilience in one sequence. Start with service-to-service requests, schemas, and payload flows. Then layer in unpredictable events—packet loss, container restarts, stale caches—while those same integration scenarios run in real time.