Merge pull request coffeescript-cookbook#103 from rdubigny/master

Change folder name "tests" -> "test"

Author: peterhellberg

chapters/testing/testing_with_nodeunit.md

@@ -17,7 +17,7 @@ For example, we expect our calculator will be able to add and subtract and will
 
 {% highlight coffeescript %}
 
-# tests/calculator.test.coffee
+# test/calculator.test.coffee
 
 Calculator = require '../calculator'