[WIP]improve ut coverage

[ABNER-1]

Ⅰ. Describe what this PR does

Ⅱ. Does this pull request fix one issue?

Ⅲ. Describe how to verify it

Ⅳ. Special notes for reviews

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[ABNER-1]

Powered by Claude Code; fixes coming soon.

[kruise-bot]

@ABNER-1: PR needs rebase.

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