Add checks for window global assignments in loadJsdom

[kitsonk]

Type: bug

The following has been addressed in the PR:

• There is a related issue
• All code matches the style guide
• Unit or Functional tests are included in the PR

Description:

This is just to help ensure that loadJsdom load the DOM in a way that is likely to be the most widely supported by code.

[codecov]

Codecov Report

Merging #11 into master will decrease coverage by 1.6%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #11      +/-   ##
==========================================
- Coverage   98.57%   96.96%   -1.61%     
==========================================
  Files           8        8              
  Lines         560      560              
  Branches      126      126              
==========================================
- Hits          552      543       -9     
- Misses          4        9       +5     
- Partials        4        8       +4

Impacted Files	Coverage Δ
src/support/assertRender.ts	91.42% <0%> (-8.58%)	⬇️
src/harness.ts	95.5% <0%> (-3%)	⬇️

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[kitsonk]

Tests for #10 which really isn't an issue.

codecov is crazy... this won't reduce the coverage of the by merging, because none of the functional code is being touched... 😢