Add unit test

Signed-off-by: Xianglin Gao <xlgao@zju.edu.cn>

cmd/cri-containerd/cri_containerd.go

@@ -42,8 +42,8 @@ func main() {
 	if err != nil {
 		glog.Exitf("Failed to connect containerd endpoint %q: %v", o.ContainerdEndpoint, err)
 	}
-	glog.V(2).Infof("Run cri-containerd grpc server on socket %q", o.SocketPath)
 
+	glog.V(2).Infof("Run cri-containerd grpc server on socket %q", o.SocketPath)
 	service, err := server.NewCRIContainerdService(conn, o.RootDir, o.NetworkPluginBinDir, o.NetworkPluginConfDir)
 	if err != nil {
 		glog.Exitf("Failed to create CRI containerd service %+v: %v", o, err)