test: enrich ut for WithWriteTimeout in server/option.go

[justlorain]

What type of PR is this?

test: Adding missing tests or correcting existing tests

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.

补充 server/option.go 中 WithWriteTimeout 的单元测试

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

en: enrich ut for WithWriteTimeout in server/option.go
zh(optional): 补充 server/option.go 中 WithWriteTimeout 的单元测试

Which issue(s) this PR fixes:

null

[li-jin-gou]

LGTM

[codecov]

Codecov Report

Base: 67.16% // Head: 67.19% // Increases project coverage by +0.03% 🎉

Coverage data is based on head (2549d4f) compared to base (8e3084b).
Patch has no changes to coverable lines.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #366      +/-   ##
===========================================
+ Coverage    67.16%   67.19%   +0.03%     
===========================================
  Files           89       89              
  Lines         8578     8578              
===========================================
+ Hits          5761     5764       +3     
+ Misses        2456     2454       -2     
+ Partials       361      360       -1     

Impacted Files	Coverage Δ
pkg/common/compress/compress.go	79.04% <0.00%> (-4.77%)	⬇️
pkg/app/server/option.go	96.74% <0.00%> (+3.25%)	⬆️
pkg/common/timer/timer.go	80.95% <0.00%> (+19.04%)	⬆️

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