Unit tests

`CI PR #9`: docs: Fix typos and spelling errors, add cspell #705

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Run time

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Job	Run time
test (3.11, ubuntu-22.04)	52s
pre-commit	1m 39s
test (3.12, ubuntu-22.04)	1m 2s
test (3.13, ubuntu-22.04)	1m 50s
finish-coverage-upload	3s
	5m 26s