No virtual modules & No scoped loops for unknown collectors. #747
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This PR changes the way package-scoped fixtures are registered. Pytest-asyncio no longer creates temporary Python modules (aka "virtual modules") with fixture definitions during collection time. Some setups seem to rely on a fixed list of collected files (see #729 (comment)).
This PR also limits the impact of pytest-asyncio's collection changes for scoped event loops. The plugin no longer tries to install scoped event loops in unknown collector types.