Imports of package testing

PathSynopsis
go.etcd.io/etcd/client/v3
k8s.io/apiserver/pkg/storage/etcd3/testserver
k8s.io/apiserver/pkg/storage/storagebackend
osPackage os provides a platform-independent interface to operating system functionality.
pathPackage path implements utility routines for manipulating slash-separated paths.
testingPackage testing provides support for automated testing of Go packages.