Run tests

Fix shell-specific test assumptions (#959) #271

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Run time

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Job	Run time
yamllint	5s
pytest / setup	5s
pytest / pytest (macos-latest, 3.8)	1m 53s
pytest / pytest (macos-latest, 3.9)	1m 59s
pytest / pytest (macos-latest, 3.10)	1m 39s
pytest / pytest (macos-latest, 3.11)	1m 33s
pytest / pytest (macos-latest, 3.12)	1m 42s
pytest / pytest (ubuntu-latest, 3.8)	1m 32s
pytest / pytest (ubuntu-latest, 3.9)	1m 31s
pytest / pytest (ubuntu-latest, 3.10)	1m 29s
pytest / pytest (ubuntu-latest, 3.11)	1m 30s
pytest / pytest (ubuntu-latest, 3.12)	1m 50s
pytest / pytest (ubuntu-20.04, 3.6)	1m 44s
	18m 32s