test: add UT for blobfuse-proxy/main.go

[Zhupku]

This pull request to pkg/blobfuse-proxy introduces a mechanism to mock the gRPC server runner for testing purposes. The most important changes include adding a new variable to hold the gRPC server runner function, updating the main function to use this new variable, and creating a test to mock the gRPC server runner.

Changes to enable mocking the gRPC server runner:

• pkg/blobfuse-proxy/main.go: Added a new variable grpcServerRunner to hold the gRPC server runner function and updated the main function to use this variable instead of calling server.RunGRPCServer directly. [1] [2]

Tests for the new mocking mechanism:

• pkg/blobfuse-proxy/main_test.go: Added a new test file to mock the gRPC server runner and test the main function.<!-- Thanks for sending a pull request! Here are some tips for you:

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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

Special notes for your reviewer:

Release note:

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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[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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• OWNERS [andyzhangx]

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