test: allow testing without Qt installed #332
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we use Qt for testing, both to check our support for running within a Qt event loop, and also because the pytest-qt
qtbotfixture is a convenient way to assert signals are emitted, even with psygnal.It's long been on my todo list to bring something like
qtbot.waitSignalsto psygnal, but until I do that, we'll need to use pytest-qt.This PR makes it possible to test stuff without Qt, just skipping those tests for now. which might be handy for #331