Fix path dependency in convert_to_path test

[RHammond2]

Fix Minor Test Issue in convert_to_path

This PR addresses an error that's raised in type_dec_unit_test.py:test_convert_to_path when run from within the "tests" folder, as opposed to from the "floris" directory. As a result of #739, convert_to_path attempts to validate three separate path relationships to return a path that exists, or fails, so the updated unit test now reflects that usage, and checks for a FileExistsError in floris/tests/tests/ regardless of where pytest is invoked.

Related issue

N/A

Impacted areas of the software

• type_dec_unit_test.py:test_convert_to_path: Updated the third subtest to reflect the updated logic of convert_to_path

Additional supporting information

N/A

Test results, if applicable

All tests pass, regardless of where pytest is run from.

[rafmudaf]

@RHammond2 I expanded the test here a little and noticed that the convert_to_path function doesn't find files since the if-statements use is_dir(). If you change that to exists(), then it will support searching for both directories and files.

[RHammond2]

Thanks for the update, @rafmudaf, I think that makes a lot of sense. I intended to have the method to find paths, but I don't see any issue with expanding it to files too. I assume that'd actually make it a bit more useful as a utility function. I'll make that change on my end and double check on the tests.