Test driven development with by Sarah Dayan

Testing a component can be counter-intuitive. It requires a mental shift to wrap your head around the differences between testing components and testing plain scripts, knowing what to test and understanding the line between unit and end-to-end tests. TDD makes everything easier. Instead of writing tests by examining all bits and pieces of a finished project, and trying to guess what you should cover, you’re doing the opposite. You’re starting from actual specs, a list of things that the component should do