cluster-api-provider-azure
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Add unit tests for kubebuilder validation annotations
/kind feature
Describe the solution you'd like
Right now, the following code: https://github.com/kubernetes-sigs/cluster-api-provider-azure/blob/c5b5f632207a9a9595728d544bbd6655dc5e4193/api/v1beta1/azureimage_validation.go#L100-L116 could be completely removed, as there are kubebuilder type annotations already which enforce those rules: https://github.com/kubernetes-sigs/cluster-api-provider-azure/blob/c5b5f632207a9a9595728d544bbd6655dc5e4193/api/v1beta1/types.go#L332-L347 However, within existing test coverage, the webhooks are not really executed, so those annotations cannot be tested.
Perhaps similar approach should be used as in CAPA, where test cluster is being used to validate types, which properly use webhooks: https://github.com/kubernetes-sigs/cluster-api-provider-aws/blob/913ee944c83f94549f4ebd0afc618e0bf7053598/api/v1beta1/awscluster_webhook_test.go#L36-L261
The disadvantage of such though, is that for running those tests, extra binaries will be needed, as etcd and kube-apiserver will be running locally, which brings it's own set of issues (e.g. https://github.com/kubernetes-sigs/cluster-api/issues/4278)
Anything else you would like to add:
Found while working on #2277.
NOTE: To avoid making default developer experience more complex, webhook tests can be put behind a build tag like integration, so they are not run by default, but can always be run on CI for example.
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