Tests

Parallel Coverage in CI #220

Job	Run time
test-py3 (ubuntu-latest, 3.7, py37)	49s
test-py3 (ubuntu-latest, 3.8, py38)	27s
test-py3 (ubuntu-latest, 3.9, py39)	51s
test-py3 (ubuntu-latest, 3.10, py310)	35s
test-py3 (ubuntu-latest, 3.11, py311)	33s
test-py3 (ubuntu-latest, 3.12, py312)	35s
test-py3 (ubuntu-latest, pypy3.10, pypy310)	1m 15s
test-py3 (windows-latest, 3.7, py37)	53s
test-py3 (windows-latest, 3.8, py38)	1m 8s
test-py3 (windows-latest, 3.9, py39)	1m 12s
test-py3 (windows-latest, 3.10, py310)	1m 22s
test-py3 (windows-latest, 3.11, py311)	1m 14s
test-py3 (windows-latest, 3.12, py312)	1m 25s
test-py3 (windows-latest, pypy3.10, pypy310)	2m 6s
coverage	7s
	14m 32s

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