Lefthook, Crystalball, and git magic for smooth development experience

From this step-by-step tutorial, you will learn how to setup Lefthook git hooks manager, Crystalball test selection library, and also how to automatically install missing gems and migrate your database when you're switching to a feature branch and back to the master.Every project should have a CI installed. But CI builds sometimes can queue up, you need to wait for the notification. And anyway, is there a method to reduce the time for "implement-test-fix" cycle, save keystrokes and mouse clicks, but don't let broken code to get into the project repository? Yes, it exists long ago and is well-known: git hooks. Plain executable scripts in your local .git/hooks/ directory. But it is so bothersome to set them up, to update them. and to sync with your collaborators because you can't commit them to the repository itself.