Fix unit test to fail with proper final gRPC code

Plain "errors.New" is interpreted as transient error.

Author: jsafrane

pkg/volume/csi/BUILD

@@ -88,6 +88,8 @@ go_test(
         "//staging/src/k8s.io/component-base/featuregate/testing:go_default_library",
         "//vendor/github.com/container-storage-interface/spec/lib/go/csi:go_default_library",
         "//vendor/github.com/stretchr/testify/assert:go_default_library",
+        "//vendor/google.golang.org/grpc/codes:go_default_library",
+        "//vendor/google.golang.org/grpc/status:go_default_library",
         "//vendor/k8s.io/klog:go_default_library",
     ],
 )

pkg/volume/csi/csi_block_test.go

@@ -18,12 +18,14 @@ package csi
 
 import (
 	"context"
-	"errors"
 	"fmt"
 	"os"
 	"path/filepath"
 	"testing"
 
+	"google.golang.org/grpc/codes"
+	"google.golang.org/grpc/status"
+
 	api "k8s.io/api/core/v1"
 	"k8s.io/api/storage/v1beta1"
 	meta "k8s.io/apimachinery/pkg/apis/meta/v1"
@@ -299,7 +301,7 @@ func TestBlockMapperSetupDeviceError(t *testing.T) {
 
 	csiMapper.csiClient = setupClient(t, true)
 	fClient := csiMapper.csiClient.(*fakeCsiDriverClient)
-	fClient.nodeClient.SetNextError(errors.New("mock final error"))
+	fClient.nodeClient.SetNextError(status.Error(codes.InvalidArgument, "mock final error"))
 
 	attachID := getAttachmentName(csiMapper.volumeID, string(csiMapper.driverName), string(nodeName))
 	attachment := makeTestAttachment(attachID, nodeName, pvName)