Unit tests

`CI PR #9`: docs: Fix typos and spelling errors, add cspell #703

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Run time

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Job	Run time
test (3.11, ubuntu-22.04)	55s
pre-commit	39s
test (3.12, ubuntu-22.04)	1m 8s
test (3.13, ubuntu-22.04)	1m 23s
finish-coverage-upload	2s
	4m 7s