Choreographies have been considered a scalable and decentralized solution for composing web services. Despite the advantages, choreography de- velopment, including the testing activities, is not disciplined. This work aims at applying Test-Driven Development (TDD) on choreographies to promote a more productive development. To achieve that, we present Rehearsal, a framework that supports TDD of web service choreography by automating unit, integra- tion, and scalability testing.