Running a unit test

I am not sure what I am missing but, whenever I run a unit test class the IDE / Ruby doesn't execute my test methods.

I have both classes in the base project directory together. Here is the test class....



require 'test_class.rb'
require 'test/unit'

class TestWordsSmith

  def test_empty_string
    freq = WordFrequency.new
    assert_equal([], freq.words_from_string(""))
  end

end

I know it is running through it but the results show no tests are run....
-------------------------------------------------------------

Loaded suite /home/carl/RubymineProjects/ExampleProject/test_words_smith
Started

Finished in 0.000189 seconds.

0 tests, 0 assertions, 0 failures, 0 errors

Process finished with exit code 0