k8s-controller-testing

Envtest provides a real API server for Kubernetes controller testing, allowing you to exercise reconciliation loops and admission behavior. It supports standard Go tests to verify expected lifecycle handling and status conditions end-to-end.

CEL validation testing ensures CRD constraints are enforced by the API server. By running envtest, you can verify that your custom resource definitions reject invalid configurations and admit valid ones during controller integration tests.

Goroutine leak detection prevents resource leaks in long-running controllers. By integrating goleak checks into your standard Go tests, you can identify unreleased goroutines across unit, integration, and data-plane scenarios during test cleanup.

Yes, you can test async finalizers and status conditions. Envtest environments support verifying expected lifecycle handling, ensuring your controller correctly manages finalizer deletion and updates status conditions during asynchronous reconciliation.

Envtest works seamlessly with standard Go tests for Kubernetes controller workflows. It provides structured testing strategies for end-to-end reconciliation, allowing you to organize tests, manage cleanup, and detect leaks without requiring a full cluster.