Coding Dojos are sessions were participants are invited to participate in a programming challenge. They get the opportunity to practice Extreme Programming techniques such as Test-Driven Development, Simple Design and Pair Programming. In this dojo, the audience will be asked to concentrate on adding features (while preserving existing functionalities) to a Java project that has not been written with testability in mind. In other words, we will work on legacy code. The Randori format will be used to let as many participants as possible do actual coding.