Code coverage

We did not use code coverage tools throughout this exercise. The reason is that we wanted you to be focused on the Red-Green-Refactor model. You wrote a test, saw it fail, wrote the implementation code, saw that all the tests were executed successfully, refactored the code whenever you saw an opportunity to make it better, and then you repeated the process. Did our tests cover all cases? That's something that code coverage tools such as JaCoCo can answer. Should you use those tools? Probably, only in the beginning. Let me clarify that. When you are starting with TDD, you will probably miss some tests or implement more than what the tests defined. In those cases, using code coverage is a good way to learn from your own mistakes. Later on, the more experienced you become with TDD, the less of a need you'll have for such tools. You'll write tests and...