Unit tests

`CONTRIBUTING.md`: Fix typos and spelling errors #696

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Run time

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Job	Run time
test (3.11, ubuntu-22.04)	52s
test (3.12, ubuntu-22.04)	59s
test (3.13, ubuntu-22.04)	1m 20s
pre-commit	34s
finish-coverage-upload	2s
	3m 47s