Add first test of raising error on python side

[znicholls]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 91.48936% with 4 lines in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (result-type@02b5392). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
src/example_fgen_basic/get_square_root.py	88.23%	1 Missing and 1 partial ⚠️
src/example_fgen_basic/result/result_dp.py	92.85%	2 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff               @@
##             result-type      #34   +/-   ##
==============================================
  Coverage               ?   96.52%           
==============================================
  Files                  ?       10           
  Lines                  ?      115           
  Branches               ?        4           
==============================================
  Hits                   ?      111           
  Misses                 ?        3           
  Partials               ?        1           

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