Add new test cases.

[openshift-ci[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: xuezhaojun

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files: - ~~[OWNERS](https://github.com/open-cluster-management-io/cluster-proxy/blob/main/OWNERS)~~ [xuezhaojun] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 23.54%. Comparing base (9fba329) to head (5ed0002).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #204 +/- ## ======================================= Coverage 23.54% 23.54% ======================================= Files 9 9 Lines 1015 1015 ======================================= Hits 239 239 Misses 758 758 Partials 18 18 ``` | [Flag](https://app.codecov.io/gh/open-cluster-management-io/cluster-proxy/pull/204/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=open-cluster-management-io) | Coverage Δ | | |---|---|---| | [unit](https://app.codecov.io/gh/open-cluster-management-io/cluster-proxy/pull/204/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=open-cluster-management-io) | `23.54% <ø> (ø)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=open-cluster-management-io#carryforward-flags-in-the-pull-request-comment) to find out more.

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.