Uber automates migration of 75,000 JUnit 4 test classes to JUnit 5

Uber engineers automated the migration of over 75,000 JUnit 4 test classes to JUnit 5.

Published 17sem1 sourceNotable

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The fact

This large-scale transition reduces technical debt and modernizes the testing infrastructure.

Automation enabled the migration without manual intervention on each class.

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Auto-synthesis from 1 media source · identified on April 27, 2026