Add a fixture for running and asserting the results from the CLI #145

Job	Run time
check-for-changelog	11s
mypy	52s
imports-without-extras (ubuntu-latest, 3.10)	14s
docs	51s
imports-without-extras (ubuntu-latest, 3.11)	12s
pre-commit	24s
imports-without-extras (ubuntu-latest, 3.12)	12s
tests (ubuntu-latest, 3.10)	1m 31s
imports-without-extras (ubuntu-latest, 3.13)	13s
tests (ubuntu-latest, 3.11)	1m 25s
tests (ubuntu-latest, 3.12)	1m 15s
tests (ubuntu-latest, 3.13)	1m 25s
	8m 45s

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