Test Driven JavaScript Development- P16:This book is about programming JavaScript for the real world, using the techniques
and workflow suggested by Test-Driven Development. It is about gaining confidence
in your code through test coverage, and gaining the ability to fearlessly refactor and
organically evolve your code base. It is about writing modular and testable code. It
is about writing JavaScript that works in a wide variety of environments and that
doesn’t get in your user’s way.