Mule 3 to Mule 4 Test-Driven Migration

When performing a Mule 3 to Mule 4 migration, we want to ensure that the new Mule 4 APIs return the same results as the previous Mule 3 APIs. We also want the performance to improve or, at least, remain the same. So, there is a significant need for tests and documentation after the migration. […]