fix test warnings

[aciccarello]

Type: refactor

The following has been addressed in the PR:

• [ ] There is a related issue
• [x] All code matches the style guide
• [ ] Unit tests are included in the PR
• [ ] For new widgets, an entry has been added to the .dojorc
• [ ] For new widgets, theme.variant() is added to the root domnode
• [ ] Any widget variant uses theme.compose like this
• [ ] WidgetProperties are exported

Description: Updates tests to not pass raw arrays. This removes warnings from unit tests and helps avoid mutation.

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dojo.widgets – ./

🔍 Inspect: https://vercel.com/dojo/dojo.widgets/DXgMiCgRnY2dYGjMeCaaqHiY4oPV
✅ Preview: https://dojowidgets-git-fork-aciccarello-fix-dnode-test-warnings-dojo1.vercel.app

widget-test-docs – ./

🔍 Inspect: https://vercel.com/dojo/widget-test-docs/4QLExmFyfxwDWi2y2LUqgQjGo6Gh
✅ Preview: https://widget-test-do-git-fork-aciccarello-fix-dnode-test-warni-607bd3.vercel.app

[codecov[bot]]

Codecov Report

Merging #1691 (cf2cc76) into master (ce182a0) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1691   +/-   ##
=======================================
  Coverage   89.96%   89.96%           
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  Files          94       94           
  Lines        5031     5031           
  Branches     1364     1364           
=======================================
  Hits         4526     4526           
  Misses        249      249           
  Partials      256      256           

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