Fix fixture discovery to use definition order instead of alphabetical #14169
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Fixtures are now discovered in their definition order (as they appear in source code) rather than alphabetical order. This change resolves issues where fixtures with the same name at different scopes would be processed in unexpected order due to dir() sorting. The fix changes parsefactories() to use __dict__ iteration (which preserves insertion order in Python 3.7+) instead of dir() which sorts. This makes fixture behavior predictable based on source code order. Fixes pytest-dev#11281 Related to pytest-dev#12952
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Summary
Fixes #11281
This PR changes fixture discovery to preserve definition order instead of using alphabetical sorting from
dir().Problem
Previously,
parsefactories()useddir()to iterate over object attributes, which sorts names alphabetically. This caused unexpected behavior when fixtures with the same name were defined at different scopes (e.g., module vs class level), because the order of discovery depended on alphabetical sorting rather than source code order.Solution
Changed
parsefactories()to use__dict__iteration (similar to howPyCollector.collect()works), which preserves insertion/definition order in Python 3.7+. This ensures fixtures are processed in the order they appear in source code, making behavior predictable and intuitive.Changes
FixtureManager.parsefactories()to iterate__dict__instead ofdir()PyCollector)Test plan
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