Add more tests & fix linting

[jowilf]

No description provided.

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (21a4bcd) 100.00% compared to head (880d893) 100.00%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #109   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           26        27    +1     
  Lines         1853      1882   +29     
=========================================
+ Hits          1853      1882   +29     

Files Changed	Coverage Δ
sqlalchemy_file/processors.py	100.00% <ø> (ø)
sqlalchemy_file/file.py	100.00% <100.00%> (ø)
sqlalchemy_file/storage.py	100.00% <100.00%> (ø)
sqlalchemy_file/validators.py	100.00% <100.00%> (ø)
tests/test_file.py	100.00% <100.00%> (ø)
tests/test_single_field.py	100.00% <100.00%> (ø)
tests/test_storage_manager.py	100.00% <100.00%> (ø)

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