Add unit test for func JoinSuffixes

[hs0210]

Signed-off-by: Hu Shuai hus.fnst@cn.fujitsu.com

[k8s-ci-robot]

Hi @hs0210. Thanks for your PR.

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[hakman]

/ok-to-test

[rifelpet]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: hs0210, rifelpet

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