refactor unit test func

[googs1025]

What type of PR is this?

What this PR does / why we need it:

• more info: https://github.com/volcano-sh/volcano/issues/4265

Which issue(s) this PR fixes:

Fixes https://github.com/volcano-sh/volcano/issues/4265

Special notes for your reviewer:

Does this PR introduce a user-facing change?

None

[volcano-sh-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[volcano-sh-bot]

@googs1025: PR needs rebase.

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[JesseStutler]

It's a great work. Wish someone could inherit it!