Verify pre-release

Add tests; separate `cli` and core logic #3

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Run time

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Job	Run time
Test code (ubuntu-latest, 3.8)	44s
Lint code (3.8)	1m 10s
Test code (ubuntu-latest, 3.12)	6m 31s
Lint code (3.9)	1m 4s
Test code (windows-latest, 3.8)	2m 19s
Lint code (3.10)	1m 6s
Test code (windows-latest, 3.12)	6m 45s
Lint code (3.11)	50s
Lint code (3.12)	6m 28s
	26m 57s