tltr; Make less tests with higher coverage. Write that are more valuable than the time they take to run. Use tests as requirements not as documentation. What is TDD The core idea of TDD is to first write down your requirements as tests and then implement them. If all tests passed, then you can assume that you implemented a correct soluction. Video: Ian Cooper - TDD, Where did it all go wrong Daniel Terhorst-North about the creation of BDD "Behaviour Driven Development" will often be used to ...