Testing

1. Install sbt
2. Run the test command in sbt

$ sbt test
[info] MonoidTests:
[info] - list monoid
[info] - option monoid
[info] - endo monoid
[info] - function monoid
[info] Passed: Total 4, Failed 0, Errors 0, Passed 4
[success] Total time: 1 s, completed Jan 5, 2014 5:26:33 PM