Ensuring the stability of a major release like Airflow 3 required extensive testing across multiple dimensions. In this session, we will dive into the testing strategies and validation techniques used to guarantee a smooth rollout. From unit and integration tests to real-world DAG validations, this talk will cover the challenges faced, key learnings, and best practices for testing Airflow. Whether you’re a contributor, QA engineer, or Airflow user preparing for migration, this session will offer valuable takeaways to improve your own testing approach.