Testing issues of unimacro

[quintijn]

When I run pytest on the whole tests directory, errors occur, that stay away when one module is run a a time.

I think the @cache in conftest.py is too rough, and should be changed into a fixture with scope="module".

`@cache #only needs to be called once
def unimacro_source_dir() ->Path:
return Path(importlib.util.find_spec("unimacro").submodule_search_locations[0])

@cache
def unimacro_sample_ini_dir() ->Path:
return unimacro_source_dir()/"sample_ini"
`

Doug could you have a look into this?