test: add unit test for Explorer Service

[mortalYoung]

简介

• 新增测试用例
• 优化了 service

主要变更

• 修改了一下顺序，现在 interface 的顺序是按照 panel 的增删改查到 action 的 增删改查，然后是 reset 和 事件订阅
• 添加了一些判断在 add 和 remove 接口
• 优化 updatePanel 的接口的逻辑，本来需要传 panels 数组全部的值，显然不合理
• src/services/workbench/__tests__/explorerService.test.ts -> src/services/__tests__/explorerService.test.ts

[codecov]

Codecov Report

Merging #378 (fa54d0f) into main (0ca5622) will increase coverage by 2.63%.
The diff coverage is 96.15%.

@@            Coverage Diff             @@
##             main     #378      +/-   ##
==========================================
+ Coverage   65.91%   68.55%   +2.63%     
==========================================
  Files         176      176              
  Lines        4774     4796      +22     
  Branches     1030     1033       +3     
==========================================
+ Hits         3147     3288     +141     
+ Misses       1608     1490     -118     
+ Partials       19       18       -1     

Impacted Files	Coverage Δ
src/components/collapse/index.tsx	47.14% <ø> (ø)
src/model/workbench/explorer/explorer.tsx	92.30% <ø> (ø)
...c/services/workbench/explorer/folderTreeService.ts	16.03% <0.00%> (+0.58%)	⬆️
src/services/helper.ts	100.00% <100.00%> (+9.83%)	⬆️
src/services/workbench/explorer/explorerService.ts	100.00% <100.00%> (+68.29%)	⬆️
src/services/keybinding.ts	84.61% <0.00%> (+3.84%)	⬆️
src/common/dom.ts	74.57% <0.00%> (+8.47%)	⬆️
src/components/scrollable/index.tsx	100.00% <0.00%> (+13.33%)	⬆️
... and 4 more

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[mortalYoung]

• 补充 helper 的测试用例

[wewoor]

+1