Worked on the pytest-dev/pytest repository to deliver a targeted deprecation of using self in class-scoped fixtures defined as instance methods on base classes. Addressed issues with fixture scope semantics by implementing runtime warnings and updating documentation to guide users toward adopting @classmethod, ensuring fixture attributes remain accessible across all test methods. The approach included comprehensive migration guidance to reduce unexpected test behavior and improve long-term maintainability. Leveraged Python and test automation skills to align the fixture model with project goals, closing two longstanding issues and enhancing both developer experience and test reliability through clearer, more predictable fixture usage patterns.