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Uber Migrates 75,000+ Test Classes from Junit 4 to Junit 5 Using Automated Code Transformation
Our take
Uber's engineering team has successfully migrated over 75,000 test classes from JUnit 4 to JUnit 5, leveraging automated code transformation through OpenRewrite and their internal orchestration tools. This significant upgrade enhances their testing infrastructure by enabling dual execution on the JUnit Platform with Bazel, ensuring seamless integration and validation via continuous integration (CI). The migration not only modernizes their testing process but also maintains accuracy across their extensive monorepo, demonstrating Uber's commitment to innovation and efficiency in software development. By Leela Kumili.
Uber engineers migrated over 75,000 test classes from JUnit 4 to JUnit 5 using automated code transformation with OpenRewrite and internal orchestration. By enabling the JUnit Platform for dual execution with Bazel and validating changes through CI, the team modernized testing infrastructure while maintaining correctness at monorepo scale.
By Leela KumiliRead on the original site
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