Add some tests #20

Job	Run time
pytest / setup	5s
pytest / pytest (macos-latest, 3.8)	1m 16s
pytest / pytest (macos-latest, 3.9)	1m 12s
pytest / pytest (macos-latest, 3.10)	1m 7s
pytest / pytest (macos-latest, 3.11)	41s
pytest / pytest (macos-latest, 3.12)	35s
pytest / pytest (ubuntu-22.04, 3.8)	4m 9s
pytest / pytest (ubuntu-22.04, 3.9)	3m 50s
pytest / pytest (ubuntu-22.04, 3.10)	4m 1s
pytest / pytest (ubuntu-22.04, 3.11)	4m 30s
pytest / pytest (ubuntu-22.04, 3.12)	5m 39s
pytest / pytest (windows-latest, 3.8)	1m 37s
pytest / pytest (windows-latest, 3.9)	1m 38s
pytest / pytest (windows-latest, 3.10)	2m 26s
pytest / pytest (windows-latest, 3.11)	1m 35s
pytest / pytest (windows-latest, 3.12)	1m 48s
pytest / pytest (ubuntu-20.04, 3.6)	49s
	36m 58s

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