tests

tests #420

Job	Run time
Tests (8.1, ubuntu-latest, prefer-lowest)	34s
Tests (8.1, ubuntu-latest, prefer-stable)	49s
Tests (8.1, macos-latest, prefer-lowest)	1m 12s
Tests (8.1, macos-latest, prefer-stable)	1m 7s
Tests (8.1, windows-latest, prefer-lowest)	31s
Tests (8.1, windows-latest, prefer-stable)	37s
Tests (8.2, ubuntu-latest, prefer-lowest)	23s
Tests (8.2, ubuntu-latest, prefer-stable)	14s
Tests (8.2, macos-latest, prefer-lowest)	1m 12s
Tests (8.2, macos-latest, prefer-stable)	1m 10s
Tests (8.2, windows-latest, prefer-lowest)	31s
Tests (8.2, windows-latest, prefer-stable)	33s
Tests (8.3, ubuntu-latest, prefer-lowest)	11s
Tests (8.3, ubuntu-latest, prefer-stable)	17s
Tests (8.3, macos-latest, prefer-lowest)	1m 12s
Tests (8.3, macos-latest, prefer-stable)	1m 15s
Tests (8.3, windows-latest, prefer-lowest)	32s
Tests (8.3, windows-latest, prefer-stable)	31s
	12m 51s

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