2. About
Following concept from https://laracasts.com/series/code-katas-in-php/episodes/2
This following is an except from a class presentation.
3. Test-Driven Development
1. Write a test case for some code that has yet to be implemented
2. Run the test case to verify it, which fails
3. Write only as much code as necessary to make the test pass
4. Run the test case