test: command line interface

[lars-reimann]

Closes #1.

Summary of Changes

Test the command line interface with pytest.

[lars-reimann]

🦙 MegaLinter status: ✅ SUCCESS

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ PYTHON	black	3	0	0	0.7s
✅ PYTHON	flake8	3		0	0.39s
✅ PYTHON	isort	3	0	0	0.3s
✅ PYTHON	mypy	3		0	2.13s
✅ PYTHON	pylint	3		0	1.74s
✅ REPOSITORY	git_diff	yes		no	0.04s

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[codecov]

Codecov Report

Merging #63 (bc73aea) into main (defcc93) will increase coverage by 12.69%.
The diff coverage is n/a.

❗ Current head bc73aea differs from pull request most recent head 3ee04ae. Consider uploading reports for the commit 3ee04ae to get more accurate results

@@             Coverage Diff             @@
##             main      #63       +/-   ##
===========================================
+ Coverage   75.77%   88.46%   +12.69%     
===========================================
  Files          81       81               
  Lines        3719     3719               
===========================================
+ Hits         2818     3290      +472     
+ Misses        901      429      -472     

see 24 files with indirect coverage changes

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