Have you ever heard the phrase „It worked on my machine“ when debugging a production incident with microservices or custom controllers in Kubernetes? These situations are often caused by changes in the infrastructure, such as upgrades and changes to role-based access control (RBAC), or more likely, insufficient end-to-end (E2E) testing of application behaviour before deployment.

In this talk, we will briefly cover the basics of Kubernetes controllers. We will then look at writing E2E tests for controllers and microservices using the E2E framework from the Kubernetes community and the Go programming language with two concrete examples (NATS messaging and AWS Custom Controllers), and show how these tools can be incorporated into Continuous Integration (CI) pipelines such as GitHub Actions to detect changes and regressions in time for production deployment.

Whether you are a beginner or a seasoned Kubernetes expert, by the end of the talk, you will have a better understanding of how Kubernetes controllers work and how to write E2E tests. Don’t miss this opportunity to learn from a seasoned expert and network with other Kubernetes enthusiasts.