test: add test for pkg common test

[a631807682]

What type of PR is this?

test

Check the PR title.

• This PR title match the format: <type>(optional scope): <description>
• The description of this PR title is user-oriented and clear enough for others to understand.

(Optional) Translate the PR title into Chinese.

添加pkg/common/test单测

(Optional) More detail description for this PR(en: English/zh: Chinese).

en: Supplement unit test for pkg/common/test, coverage increased from 2.91% to 98.1%
zh(optional): 补充pkg/common/test的单元测试，覆盖率从2.91%提高到了98.1%

Which issue(s) this PR fixes:

related to #257

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: +1.77 🎉

Comparison is base (c98aec7) 72.49% compared to head (d4d2a26) 74.27%.

❗ Current head d4d2a26 differs from pull request most recent head 649da1d. Consider uploading reports for the commit 649da1d to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #669      +/-   ##
===========================================
+ Coverage    72.49%   74.27%   +1.77%     
===========================================
  Files           96       96              
  Lines         9392     9392              
===========================================
+ Hits          6809     6976     +167     
+ Misses        2154     1986     -168     
- Partials       429      430       +1     

see 4 files with indirect coverage changes

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[welkeyever]

Please add ut coverage changes in PR's description🙏

[welkeyever]

Also you may check other PRs for how to fill the What type of PR is this?.

[a631807682]

Also you may check other PRs for how to fill the What type of PR is this?.

I changed them, but I'm not sure if the coverage is correct.

[li-jin-gou]

Also you may check other PRs for how to fill the What type of PR is this?.

I changed them, but I'm not sure if the coverage is correct.

OK

[welkeyever]

Also you may check other PRs for how to fill the What type of PR is this?.

I changed them, but I'm not sure if the coverage is correct.

@a631807682 What type of PR is this? section only needs the type which is test in you case🙏

[welkeyever]

LGTM, thx~
Please check the PR description before merging.