add more g3proxy CI testcase

[codecov-commenter]

Codecov Report

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

Project coverage is 50.26%. Comparing base (956f675) to head (237b2c4).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #386 +/- ## ========================================== + Coverage 49.80% 50.26% +0.45% ========================================== Files 1092 1092 Lines 98850 98850 ========================================== + Hits 49236 49684 +448 + Misses 49614 49166 -448 ``` | [Flag](https://app.codecov.io/gh/bytedance/g3/pull/386/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=bytedance) | Coverage Δ | | |---|---|---| | [g3proxy](https://app.codecov.io/gh/bytedance/g3/pull/386/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=bytedance) | `50.26% <ø> (+0.45%)` | :arrow_up: | | [lib](https://app.codecov.io/gh/bytedance/g3/pull/386/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=bytedance) | `25.37% <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=bytedance#carryforward-flags-in-the-pull-request-comment) to find out more.

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