[support request] add more tests to docker-proxy

[ZYecho]

What is your problem or scenario?

docker-proxy UT request

[ZYecho]

/help

[koordinator-bot[bot]]

@ZYecho: This request has been marked as needing help from a contributor.

Please ensure the request meets the requirements listed here.

If this request no longer meets these requirements, the label can be removed by commenting with the /remove-help command.

In response to this:

/help

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[jasonliu747]

/close

[koordinator-bot[bot]]

@jasonliu747: Closing this issue.

In response to this:

/close

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.