Add unevaluatedProperties test

[justin-tay]

Closes #967

This adds a test case to verify that the issue raised has already been fixed.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (1f60740) 78.63% compared to head (2741fe6) 78.65%.

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Additional details and impacted files

@@             Coverage Diff              @@
##             master     #968      +/-   ##
============================================
+ Coverage     78.63%   78.65%   +0.01%     
- Complexity     1809     1810       +1     
============================================
  Files           161      161              
  Lines          5893     5893              
  Branches       1116     1116              
============================================
+ Hits           4634     4635       +1     
  Misses          833      833              
+ Partials        426      425       -1     

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