test: improve hertz/pkg/routeut unit test coverage

[HzTTT]

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.
• Attach the PR updating the user documentation if the current PR requires user awareness at the usage level. User docs repo

(Optional) Translate the PR title into Chinese.

提高 Hertz/pkg/routeut 单元测试覆盖率

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

en:hertz/pkg/routeut unit test coverage increased from 78.49% to 85.1%
zh(optional):hertz/pkg/routeut 单元测试覆盖率从 78.49% 增加到 85.1%

(Optional) Which issue(s) this PR fixes:

Part of #257

(Optional) The PR that updates user documentation:

[CLAassistant]

All committers have signed the CLA.

[li-jin-gou]

@HzTTT 修复一下 CI

[li-jin-gou]

本地安装 gofumpt 执行 gofumpt -e -d -w -extra . 可以修复一下 CI

[HzTTT]

@li-jin-gou
ok

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (9c3f0b7) 81.81% compared to head (0c412a7) 82.52%.

❗ Current head 0c412a7 differs from pull request most recent head 3cb2f6f. Consider uploading reports for the commit 3cb2f6f to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #992      +/-   ##
===========================================
+ Coverage    81.81%   82.52%   +0.71%     
===========================================
  Files           98       98              
  Lines         9962     9962              
===========================================
+ Hits          8150     8221      +71     
+ Misses        1319     1244      -75     
- Partials       493      497       +4     

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[welkeyever]

LGTM, thx~