Automatic merge from submit-queue (batch tested with PRs 56947, 56349, 57140, 53686, 57314). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.
Add tesecaces for testapi.go
**What this PR does / why we need it**:
improve function's test cover rate
**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes #
**Special notes for your reviewer**:
**Release note**:
```release-note
NONE
```
4c2a78efcb