Tests

fix #676 and test GUI compat better along the way #1010

Job	Run time
Test Python (3.9, ubuntu-latest, @JuliaPkg)	1m 30s
Test Python (3, windows-latest, @JuliaPkg)	3m 52s
Test Python (3, ubuntu-latest, @JuliaPkg)	1m 36s
Test Python (3, macos-latest, @JuliaPkg)	1m 42s
Test Python (3.9, macos-latest, @JuliaPkg)	1m 54s
Test Python (3.9, windows-latest, @JuliaPkg)	2m 48s
Test Julia (1, ubuntu-latest, @CondaPkg)	3m 25s
Test Julia (1, windows-latest, @CondaPkg)	6m 40s
Test Julia (1, macos-latest, @CondaPkg)	9m 1s
Test Python (3, ubuntu-latest, julia)	1m 28s
Test Julia (1.9, ubuntu-latest, @CondaPkg)	2m 35s
Test Julia (1, ubuntu-latest, python)	3m 7s
Test Julia (1.9, windows-latest, @CondaPkg)	7m 14s
Test Julia (1.9, macos-latest, @CondaPkg)	6m 3s
	52m 55s

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