Improve test-coverage on blobplugin

[TobyTheHutt]

What type of PR is this?

/kind test

What this PR does / why we need it:

Tests the serveMetrics function in the blobplugin.

Which issue(s) this PR fixes:

Fixes #

Requirements:

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

Special notes for your reviewer:

Release note:

none

[k8s-ci-robot]

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[k8s-ci-robot]

Hi @TobyTheHutt. Thanks for your PR.

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[andyzhangx]

/ok-to-test

[Copilot]

Pull Request Overview

This PR adds unit test coverage for the serveMetrics function in the blobplugin package to improve test coverage.

• Adds a comprehensive test for the serveMetrics function that validates HTTP server startup, metrics endpoint availability, and graceful shutdown
• Includes proper error handling, timeout mechanisms, and resource cleanup in the test implementation

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[Copilot]

This comment is duplicated on lines 156 and 161. Remove the duplicate comment to avoid redundancy.

Suggested change

// Validate response body is non-empty

[andyzhangx]

/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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Needs approval from an approver in each of these files:

• OWNERS [andyzhangx]

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