Unit tests

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Job	Run time
macOS-latest (devel)	55m 27s
macOS-latest (release)	1h 4m 25s
windows-latest (devel)	1h 50m 26s
windows-latest (release)	1h 43m 15s
windows-latest (oldrel)	2h 24m 22s
ubuntu-20.04 (devel)	1h 37m 37s
ubuntu-20.04 (release)	1h 53m 22s
ubuntu-20.04 (oldrel)	1h 24m 34s
ubuntu-20.04 (3.6)	1h 55m 28s
	14h 48m 56s