chore: add test case of [Settings]

[tangcent]

No description provided.

[codecov-commenter]

Codecov Report

Merging #443 (74c1c4a) into master (7ae5f58) will increase coverage by 0.497%.
The diff coverage is n/a.

@@               Coverage Diff               @@
##              master      #443       +/-   ##
===============================================
+ Coverage     32.677%   33.174%   +0.497%     
- Complexity      1153      1157        +4     
===============================================
  Files            196       196               
  Lines          11072     11072               
  Branches        2530      2530               
===============================================
+ Hits            3618      3673       +55     
+ Misses          6577      6488       -89     
- Partials         877       911       +34     

Flag	Coverage Δ	Complexity Δ
unittests	33.174% <ø> (+0.497%)	1157.000 <ø> (+4.000)

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Impacted Files	Coverage Δ	Complexity Δ
...lin/com/itangcent/idea/plugin/settings/Settings.kt	70.588% <0.000%> (+46.218%)	32.000% <0.000%> (+4.000%)

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