test: Menu component tests

[geido]

SUMMARY

Adds test cases for the Menu component while moving to react-testing-library

[codecov-io]

Codecov Report

Merging #13302 (68c6bd0) into master (29d6420) will decrease coverage by 18.67%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           master   #13302       +/-   ##
===========================================
- Coverage   77.20%   58.53%   -18.68%     
===========================================
  Files         872      480      -392     
  Lines       45101    16003    -29098     
  Branches     5435     4130     -1305     
===========================================
- Hits        34820     9367    -25453     
+ Misses      10158     6636     -3522     
+ Partials      123        0      -123     

Flag	Coverage Δ
cypress	58.53% <100.00%> (-0.01%)	⬇️
javascript	?
python	?

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...et-frontend/src/components/Menu/LanguagePicker.tsx	0.00% <ø> (-64.29%)	⬇️
superset-frontend/src/components/Menu/SubMenu.tsx	93.54% <ø> (-6.46%)	⬇️
superset-frontend/src/components/Menu/NewMenu.tsx	70.00% <100.00%> (-8.58%)	⬇️
...uperset-frontend/src/dashboard/util/dnd-reorder.js	0.00% <0.00%> (-100.00%)	⬇️
...rset-frontend/src/dashboard/util/getEmptyLayout.js	0.00% <0.00%> (-100.00%)	⬇️
...dashboard/components/resizable/ResizableHandle.jsx	0.00% <0.00%> (-100.00%)	⬇️
...tersConfigModal/Footer/CancelConfirmationAlert.tsx	0.00% <0.00%> (-100.00%)	⬇️
...ConfigModal/FiltersConfigForm/FilterScope/state.ts	0.00% <0.00%> (-100.00%)	⬇️
...odal/FiltersConfigForm/FilterScope/ScopingTree.tsx	6.25% <0.00%> (-93.75%)	⬇️
.../src/dashboard/util/getFilterScopeFromNodesTree.js	0.00% <0.00%> (-93.48%)	⬇️
... and 738 more

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[pkdotson]

LGTM!

[rusackas]

LGTM!