Writing the first unit test

TDD is a very powerful technique to write efficient, modular, and safe programs. It is very simple, and there are only three rules to play this game:

  1. You are not allowed to write any production code unless it is to make a failing unit test pass.
  2. You are not allowed to write any more of a unit test than is sufficient to fail, and compilation failures are failures.
  3. You are not allowed to write any more production code than is sufficient to pass the one failing unit test.
See the full article from Uncle Bob here: http://butunclebob.com/ArticleS.UncleBob.TheThreeRulesOfTdd.

There are multiple testing frameworks in Scala, but we chose ScalaTest (http://www.scalatest.org/) for its simplicity.

In order to add the ScalaTest ...

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