tests

Fix tests #506

Job	Run time
Tests (8.1, ubuntu-latest, prefer-lowest)	14s
Tests (8.1, ubuntu-latest, prefer-stable)	15s
Tests (8.1, macos-latest, prefer-lowest)	1m 24s
Tests (8.1, macos-latest, prefer-stable)	1m 21s
Tests (8.1, windows-latest, prefer-lowest)	42s
Tests (8.1, windows-latest, prefer-stable)	38s
Tests (8.2, ubuntu-latest, prefer-lowest)	15s
Tests (8.2, ubuntu-latest, prefer-stable)	13s
Tests (8.2, macos-latest, prefer-lowest)	1m 22s
Tests (8.2, macos-latest, prefer-stable)	1m 19s
Tests (8.2, windows-latest, prefer-lowest)	47s
Tests (8.2, windows-latest, prefer-stable)	35s
Tests (8.3, ubuntu-latest, prefer-lowest)	13s
Tests (8.3, ubuntu-latest, prefer-stable)	26s
Tests (8.3, macos-latest, prefer-lowest)	1m 31s
Tests (8.3, macos-latest, prefer-stable)	1m 23s
Tests (8.3, windows-latest, prefer-lowest)	43s
Tests (8.3, windows-latest, prefer-stable)	33s
	13m 54s

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