Earlier JUnit libraries relied on Inheritance and specific design patterns to integrate the unit tests into runnable test suites. Modern JUnit relies on Java Annotations - which simplify test structure and enable more flexible structuring of tests classes.

One way of becoming familiar with TDD is to explore some simple examples of various strategies that might be employed in some simple examples. Here we look at useful examples from the Pragmatic series - which laid out much of the early exploration of TDD.

We try to apply some of these practices to the Pacemaker app we are building the labs. In general many of the tests are straightforward, however there are some subtleties in the serializer tests.

• Create a new project to host a version of pacemaker implemented in Xtend
• Build the project + its unit tests
• Explore the generated Java sources