issue 6693: partially fail restore if CSI snapshot is involved but CSI feature is not ready

Signed-off-by: Lyndon-Li <lyonghui@vmware.com>

pkg/plugin/clientmgmt/manager_test.go

@@ -61,6 +61,10 @@ func (r *mockRegistry) Get(kind common.PluginKind, name string) (framework.Plugi
 	return id, args.Error(1)
 }
 
+func (r *mockRegistry) Find(kind common.PluginKind, name string) bool {
+	return false
+}
+
 func TestNewManager(t *testing.T) {
 	logger := test.NewLogger()
 	logLevel := logrus.InfoLevel