chore: increase code coverage by adding more tests

[chrisvogt]

This PR increases the code coverage of the theme.js file by adding a snapshot test for the compiled theme object's value.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.76%. Comparing base (327b652) to head (88bef62).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #259      +/-   ##
==========================================
+ Coverage   91.07%   92.76%   +1.69%     
==========================================
  Files          67       67              
  Lines         650      650              
  Branches      182      182              
==========================================
+ Hits          592      603      +11     
+ Misses         51       42       -9     
+ Partials        7        5       -2     

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[chrisvogt]

Manual verification via the deploy preview looks good. I'm going to merge this,