CI: 添加测试用例

[codecov[bot]]

Codecov Report

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

Comparison is base (078c879) 75.21% compared to head (9202964) 81.28%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #97 +/- ## ========================================== + Coverage 75.21% 81.28% +6.07% ========================================== Files 11 11 Lines 1400 1400 ========================================== + Hits 1053 1138 +85 + Misses 347 262 -85 ``` | [Flag](https://app.codecov.io/gh/nonebot/adapter-feishu/pull/97/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=nonebot) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/nonebot/adapter-feishu/pull/97/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=nonebot) | `81.28% <ø> (+6.07%)` | :arrow_up: | 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=nonebot#carryforward-flags-in-the-pull-request-comment) to find out more.

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[github-actions[bot]]

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