tests

Finalize #290

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Job	Run time
collateral (diffcov)	51s
test (3.8, ubuntu-latest)	39s
collateral (docs)	51s
test (3.8, macos-latest)	52s
test (3.8, windows-latest)	1m 20s
test (3.12, ubuntu-latest)	53s
test (3.12, macos-latest)	57s
test (3.12, windows-latest)	1m 21s
test (3.9, ubuntu-latest)	36s
test (3.10, ubuntu-latest)	35s
test (3.11, ubuntu-latest)	36s
test (pypy3.10, ubuntu-latest)	4m 34s
check	1s
release	0s
	14m 6s