WIP: test pythongen forward reference bug.

[cmungall]

When this PR is merged, it fixes #1168

[codecov-commenter]

Codecov Report

Merging #1169 (2948a85) into main (58550cc) will increase coverage by 0.27%.
The diff coverage is 87.64%.

@@            Coverage Diff             @@
##             main    #1169      +/-   ##
==========================================
+ Coverage   78.16%   78.43%   +0.27%     
==========================================
  Files          74       74              
  Lines        8465     8599     +134     
  Branches     2027     2116      +89     
==========================================
+ Hits         6617     6745     +128     
- Misses       1453     1454       +1     
- Partials      395      400       +5     

Impacted Files	Coverage Δ
...tors/sqlalchemy/sqlalchemy_declarative_template.py	100.00% <ø> (ø)
linkml/generators/jsonschemagen.py	87.84% <86.74%> (-4.12%)	⬇️
linkml/utils/generator.py	86.11% <100.00%> (+1.10%)	⬆️
linkml/utils/converter.py	51.45% <0.00%> (-0.51%)	⬇️
linkml/generators/prefixmapgen.py	73.11% <0.00%> (ø)
linkml/generators/oocodegen.py	93.28% <0.00%> (+0.05%)	⬆️
linkml/generators/sqlddlgen.py	83.45% <0.00%> (+0.05%)	⬆️
linkml/generators/docgen.py	86.35% <0.00%> (+0.10%)	⬆️
linkml/generators/csvgen.py	98.07% <0.00%> (+0.11%)	⬆️
... and 9 more

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[sierra-moxon]

closing this PR as it is a yaml example file and a test with no asserts -- I think this is because this was already fixed in another PR and this is redundant. please of course reopen if I got this wrong.