Controller integration test

[piceri]

This change adds integration testing to the controller using https://pkg.go.dev/sigs.k8s.io/controller-runtime/pkg/envtest

The integration test:

• has a setup function that uses envtest to setup a mock controller environment that can be called by each test
• Test deployment lifecycle by creating a deployment, scaling up, scaling down, then deleting a deployment
• Tests deployment with init containers
• Tests running controller to only watch one namespace
• Tests running controller with excluded namespaces

[Copilot]

Pull request overview

Adds an envtest-based integration test suite for the Kubernetes controller to validate end-to-end behavior (pod lifecycle → deployment record posting) in a realistic API server environment, plus minimal plumbing to make the controller’s poster mockable.

Changes:

• Introduces internal/controller/controller_integration_test.go with envtest setup and multiple controller integration scenarios (deployment lifecycle, init containers, namespace filtering).
• Refactors the controller’s apiClient field behind a small interface to enable test-time mocking.
• Updates make test and GitHub Actions workflow to install/use setup-envtest and set KUBEBUILDER_ASSETS for envtest.

Reviewed changes

Copilot reviewed 5 out of 6 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
internal/controller/controller_integration_test.go	New envtest integration tests and helper utilities for controller verification.
internal/controller/controller.go	Makes the deployment record poster mockable via an interface.
go.mod	Adds controller-runtime (envtest) and testify dependencies.
go.sum	Updates sums for newly added/updated dependencies.
Makefile	Runs tests with KUBEBUILDER_ASSETS populated via setup-envtest.
.github/workflows/build.yml	Installs setup-envtest in CI before running make test.

Comments suppressed due to low confidence (1)

internal/controller/controller_integration_test.go:108

• cache.WaitForCacheSync(ctx.Done(), ...) does not have its own timeout; with a non-cancelled ctx this can block forever and hang the test suite. Consider using a context.WithTimeout (or a time-bounded channel) specifically for cache sync and fail the test if it doesn’t sync in time.

	go func() {
		_ = ctrl.Run(ctx, 1)
	}()
	if !cache.WaitForCacheSync(ctx.Done(), ctrl.podInformer.HasSynced) {
		t.Fatal("timed out waiting for informer cache to sync")
	}

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