Tests: Add unit tests and update travis with root

The commit adds tests for nodeserver and
safe mounter

The commit also updates .tarvis.yaml
to run the tests with root permission.

This is necessary as some operations in
the unit tests require root priviledges
e.g. mounting.

Signed-off-by: Animesh Kumar <animuz111@gmail.com>

.travis.yml

@@ -9,5 +9,5 @@ before_install:
   - GO111MODULE=off go get github.com/mattn/goveralls
 
 script:
-  - go test -covermode=count -coverprofile=profile.cov ./pkg/...
+  - sudo -E env "PATH=$PATH" go test -covermode=count -coverprofile=profile.cov ./pkg/...
   - $GOPATH/bin/goveralls -coverprofile=profile.cov -service=travis-ci

pkg/azurefile/nodeserver.go

@@ -228,13 +228,13 @@ func (d *Driver) NodeUnstageVolume(ctx context.Context, req *csi.NodeUnstageVolu
 
 	klog.V(2).Infof("NodeUnstageVolume: CleanupMountPoint %s", stagingTargetPath)
 	if err := CleanupSMBMountPoint(d.mounter, stagingTargetPath, false); err != nil {
-		return nil, status.Errorf(codes.Internal, "failed to unmount staing target %q: %v", stagingTargetPath, err)
+		return nil, status.Errorf(codes.Internal, "failed to unmount staging target %q: %v", stagingTargetPath, err)
 	}
 
 	targetPath := filepath.Join(filepath.Dir(stagingTargetPath), proxyMount)
 	klog.V(2).Infof("NodeUnstageVolume: CleanupMountPoint %s", targetPath)
 	if err := CleanupMountPoint(d.mounter, targetPath, false); err != nil {
-		return nil, status.Errorf(codes.Internal, "failed to unmount staing target %q: %v", targetPath, err)
+		return nil, status.Errorf(codes.Internal, "failed to unmount staging target %q: %v", targetPath, err)
 	}
 	klog.V(2).Infof("NodeUnstageVolume: unmount %s successfully", stagingTargetPath)