test(extra): add test code about extra

[kyungilpark]

#131

[codecov-io]

Codecov Report

Merging #141 into master will increase coverage by 0.78%.
The diff coverage is n/a.

@@            Coverage Diff            @@
##           master    #141      +/-   ##
=========================================
+ Coverage    6.67%   7.45%   +0.78%     
=========================================
  Files          68      68              
  Lines        9067    9062       -5     
  Branches     2014    2009       -5     
=========================================
+ Hits          605     676      +71     
+ Misses       6586    6523      -63     
+ Partials     1876    1863      -13

Impacted Files	Coverage Δ
workspace/src/extra/husky_SE2B_Lang_en_US.js	100% <ø> (ø)	⬆️
workspace/src/extra/husky_SE2B_Lang_ko_KR.js	100% <ø> (ø)	⬆️
workspace/src/extra/husky_SE2B_Lang_zh_CN.js	100% <ø> (ø)	⬆️
workspace/src/extra/husky_SE2B_Lang_ja_JP.js	100% <ø> (ø)	⬆️
workspace/src/extra/husky_SE2B_Lang_zh_TW.js	100% <ø> (ø)	⬆️
workspace/src/extra/hp_SE_ToolbarToggler.js	100% <0%> (+90%)	⬆️
workspace/src/extra/hp_SE2B_CSSLoader.js	96.15% <0%> (+92.3%)	⬆️
workspace/src/extra/hp_SE_OuterIFrameControl.js	100% <0%> (+97.72%)	⬆️

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