Worked on the fastapi/fastapi repository to deliver cross-version Pydantic snapshot test compatibility, addressing the challenge of maintaining reliable tests during migrations between Pydantic v1 and v2. Developed a pydantic_snapshot utility and integrated inline-snapshot-based tests, ensuring consistent snapshot results regardless of the Pydantic version in use. This approach reduced regression risk and aligned the test suite with evolving inline-snapshot support. The work was implemented using Python, leveraging FastAPI and Pydantic, with a strong emphasis on testing practices. No major bugs were fixed during this period, and the primary focus remained on enhancing test infrastructure for long-term maintainability.