tests

tests #1847

Job	Run time
tests (ubuntu-latest, x64, 3.7, local)	31s
tests (ubuntu-latest, x64, 3.8, local)	26s
tests (ubuntu-latest, x64, 3.9, local)	27s
tests (ubuntu-latest, x64, 3.x, local)	38s
tests (windows-latest, x64, 3.7, local)	1m 10s
tests (windows-latest, x64, 3.8, local)	55s
tests (windows-latest, x64, 3.9, local)	1m 13s
tests (windows-latest, x64, 3.x, local)	1m 13s
tests (windows-latest, x86, 3.7, local)	1m 38s
tests (windows-latest, x86, 3.8, local)	1m 16s
tests (windows-latest, x86, 3.9, local)	1m 31s
tests (windows-latest, x86, 3.x, local)	1m 39s
tests (macos-latest, x64, 3.7, local)	50s
tests (macos-latest, x64, 3.8, local)	45s
tests (macos-latest, x64, 3.9, local)	1m 8s
tests (macos-latest, x64, 3.x, local)	1m 13s
	16m 33s

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