Tests

fix #676 and test GUI compat better along the way #1006

Job	Run time
Test Python (3, ubuntu-latest, @JuliaPkg)	19s
Test Python (3.9, ubuntu-latest, @JuliaPkg)	1m 40s
Test Python (3.9, macos-latest, @JuliaPkg)	2m 23s
Test Python (3, ubuntu-latest, julia)	1m 33s
Test Julia (1.9, macos-latest, @CondaPkg)	4m 59s
Test Python (3, windows-latest, @JuliaPkg)	3m 1s
Test Julia (1, macos-latest, @CondaPkg)	4m 24s
Test Julia (1, ubuntu-latest, @CondaPkg)	2m 40s
Test Julia (1, windows-latest, @CondaPkg)	5m 36s
Test Python (3.9, windows-latest, @JuliaPkg)	3m 7s
Test Python (3, macos-latest, @JuliaPkg)	1m 27s
Test Julia (1, ubuntu-latest, python)	4m 1s
Test Julia (1.9, windows-latest, @CondaPkg)	5m 3s
Test Julia (1.9, ubuntu-latest, @CondaPkg)	2m 16s
	42m 29s

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