improve ut coverage

[andyzhangx]

Is your feature request related to a problem?/Why is this needed

Describe the solution you'd like in detail

e.g. write a unit test for newNFSSnapshot func

csi-driver-nfs/pkg/nfs/controllerserver.go

Line 562 in 862cb03

func newNFSSnapshot(name string, params map[string]string, vol *nfsVolume) (*nfsSnapshot, error) {

https://coveralls.io/github/kubernetes-csi/csi-driver-nfs?branch=master

Describe alternatives you've considered

Additional context

[wozniakjan]

just providing some additional information about the current coverage for newNFSSnapshot() which is at 66%. While there is some coverage, especially the params section needs some extra love

csi-driver-nfs/pkg/nfs/controllerserver.go

Lines 565 to 574 in 862cb03

	for k, v := range params {
	switch strings.ToLower(k) {
	case paramServer:
	server = v
	case paramShare:
	baseDir = v
	default:
	return nil, status.Errorf(codes.InvalidArgument, fmt.Sprintf("invalid parameter %q in snapshot storage class", k))
	}
	}

to get more granular stats, the following code snippet can be used. Opening the cover.html in a browser gives a nice line-by-line view.

$ go test -covermode=count -coverpkg=./... -coverprofile cover.out -v ./pkg/nfs/...
$ go tool cover -html cover.out -o cover.html
$ go tool cover -func=cover.out | grep newNFSSnapshot
github.com/kubernetes-csi/csi-driver-nfs/pkg/nfs/controllerserver.go:562:       newNFSSnapshot                          66.7%

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/lifecycle stale

[k8s-triage-robot]

The Kubernetes project currently lacks enough active contributors to adequately respond to all issues.

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• After 90d of inactivity, lifecycle/stale is applied
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/lifecycle rotten

[k8s-triage-robot]

The Kubernetes project currently lacks enough contributors to adequately respond to all issues.

This bot triages un-triaged issues according to the following rules:

• After 90d of inactivity, lifecycle/stale is applied
• After 30d of inactivity since lifecycle/stale was applied, lifecycle/rotten is applied
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/lifecycle stale

[k8s-triage-robot]

The Kubernetes project currently lacks enough active contributors to adequately respond to all issues.

This bot triages un-triaged issues according to the following rules:

• After 90d of inactivity, lifecycle/stale is applied
• After 30d of inactivity since lifecycle/stale was applied, lifecycle/rotten is applied
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/lifecycle rotten

[k8s-triage-robot]

The Kubernetes project currently lacks enough active contributors to adequately respond to all issues and PRs.

This bot triages issues according to the following rules:

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/close not-planned

[k8s-ci-robot]

@k8s-triage-robot: Closing this issue, marking it as "Not Planned".

In response to this:

The Kubernetes project currently lacks enough active contributors to adequately respond to all issues and PRs.

This bot triages issues according to the following rules:

• After 90d of inactivity, lifecycle/stale is applied
• After 30d of inactivity since lifecycle/stale was applied, lifecycle/rotten is applied
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/close not-planned

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[k8s-triage-robot]

The Kubernetes project currently lacks enough contributors to adequately respond to all issues.

This bot triages un-triaged issues according to the following rules:

• After 90d of inactivity, lifecycle/stale is applied
• After 30d of inactivity since lifecycle/stale was applied, lifecycle/rotten is applied
• After 30d of inactivity since lifecycle/rotten was applied, the issue is closed

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/lifecycle stale