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:

Inside test_workomatic.rb

  $:.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.