Added failing test for binding a custom DateTime type

[glen-84]

Summary of the changes (Less than 80 chars)

• Added failing test for binding a custom DateTime type.

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• The test location is temporary – not sure where to put it yet.
• This only happens once you add filtering (or probably sorting, etc.).

Relates to #7402.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.87%. Comparing base (8444c21) to head (bd963d9).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7502      +/-   ##
==========================================
+ Coverage   77.86%   77.87%   +0.01%     
==========================================
  Files        2826     2826              
  Lines      141958   141958              
==========================================
+ Hits       110540   110555      +15     
+ Misses      31418    31403      -15     

Flag	Coverage Δ
unittests	77.87% <ø> (+0.01%)	⬆️

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