[codecraft] tests so people don't break your code

[Philip Durbin]

“the best way to make sure that someone else doesn’t break [your] code, is
to enforce its functionality in tests.”
https://twitter.com/brwngrldev/status/704303348762189825

Part of
https://medium.com/@willh/how-to-level-up-as-a-developer-87344584777c#.eeum1kuwn
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