【arklet】fix unit test bugs

[Lunarscave]

No description provided.

[codecov]

Codecov Report

Patch coverage: 46.15% and project coverage change: +0.64% 🎉

Comparison is base (77b7075) 46.19% compared to head (a832a20) 46.83%.
Report is 19 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #105      +/-   ##
============================================
+ Coverage     46.19%   46.83%   +0.64%     
- Complexity      160      164       +4     
============================================
  Files            45       45              
  Lines          1156     1153       -3     
  Branches         56       56              
============================================
+ Hits            534      540       +6     
+ Misses          597      587      -10     
- Partials         25       26       +1     

Files Changed	Coverage Δ
.../arklet/core/command/builtin/model/PluginInfo.java	0.00% <0.00%> (ø)
...ess/arklet/core/health/indicator/CpuIndicator.java	95.55% <ø> (ø)
...sofa/serverless/arklet/core/util/ConvertUtils.java	66.66% <ø> (+26.66%)	⬆️
...rverless/arklet/core/health/HealthServiceImpl.java	37.36% <40.00%> (-0.69%)	⬇️
...erless/arklet/core/health/indicator/Indicator.java	100.00% <100.00%> (ø)
...ess/arklet/core/health/indicator/JvmIndicator.java	100.00% <100.00%> (ø)

... and 4 files with indirect coverage changes

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