test: add UT coverage for blob/nodeserver.go

[Zhupku]

What type of PR is this?

What this PR does / why we need it:

Which issue(s) this PR fixes:

Fixes #

Requirements:

• uses conventional commit messages
• includes documentation
• adds unit tests
• tested upgrade from previous version

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none

[k8s-ci-robot]

Hi @Zhupku. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[Zhupku]

Seems now dlv 1.24.2 still using go 1.23.4, which makes me unable to debug the test locally. Anybody knows the solution?

(base) azureuser@mengzezhu-devcsivm:~/code/blob-csi-driver$ ~/goroot/bin/dlv version --verbose
2025-05-07T12:52:21Z warn layer=dlv CGO_CFLAGS already set, Cgo code could be optimized.
Delve Debugger
Version: 1.24.2
Build: $Id: 3a8157f82a350d5780044f53221b53e4dcf1a201 $
Build Details: go1.23.4

[Zhupku]

Do you know why encounter License Compliance issue? @andyzhangx

[andyzhangx]

Do you know why encounter License Compliance issue? @andyzhangx

I have select ignore in FOSS website, not relate to this PR.

[andyzhangx]

/ok-to-test

[andyzhangx]

/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: andyzhangx, Zhupku

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[andyzhangx]

/retest