Its a good idea to keep your test cases seperate from your production code:
myproject lib/ workomatic.rb test/ test_workomatic.rb
When you have your project setup in this way add the following line to the top of your test cases:
$:.unshift File.join(File.dirname(__FILE__), "..", "lib") require workomatic.rb
Now when you run this test case the workomatic.rb file and all supporting files in the lib folder will be picked up.