The `test/testdata/storage-class` directory contains the StorageClass YAMLs used for E2E.
The public cloud provider (including AWS, Azure and GCP) has two StorageClasses.
* The `provider-name`.yaml contains the default StorageClass for the provider. It uses the CSI provisioner.
* The `provider-name`-legacy.yaml contains the legacy StorageClass for the provider. It uses the in-tree volume plugin as the provisioner. By far, there is no E2E case using them.

The vSphere environment also has two StorageClass files.
* The vsphere-legacy.yaml is used for the TKGm environment.
* The vsphere.yaml is used for the VKS environment.

The ZFS StorageClasses only have the default one. There is no in-tree volume plugin used StorageClass used in E2E.

The kind StorageClass uses the local-path provisioner. Will consider adding the CSI provisioner when there is a need.