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PytestCollectionWarning cannot collect test class pytest 8.0 fix: abstract classes, staticmethod parametrize, multiple inheritance, empty Test classes. Migration guide, code examples, pytestmark.skipif(inspect.isabstract). Keywords: 'PytestCollectionWarning pytest 8', 'cannot collect test class pytest', 'pytest 8 collection changes', 'fix pytest abstract test class warning'.
Mar 15, 2026