$ find
.
./features
./features/add_note.feature
./features/step_definitions
./features/step_definitions/add_note_step.rb
./notepad.rb
./Rakefile
./test
./test/test_notepad.rb
$ cat notepad.rb
$notes = []

def add note
	$notes << note
end

if __FILE__ == $0
	# ...
	puts "Hello, this line will not be executed during the tests."
	# ...
end
$ cat Rakefile
require 'rake/testtask'
require 'cucumber/rake/task'

Rake::TestTask.new do |t|
	t.libs << "test"
	t.test_files = FileList['test/test*.rb']
	t.verbose = true
end

Cucumber::Rake::Task.new(:cucumber) do |t|
	t.cucumber_opts = ["features"]
end
$ cat test/test_notepad.rb
require 'test/unit'
require_relative '../notepad.rb'

class TestNotepad < Test::Unit::TestCase
	def test_add
		add "Do stuff."
		assert_equal($notes.size, 1)
		assert_equal($notes.first, "Do stuff.")
	end
end
$ cat features/add_note.feature
Feature: Notepad
	Scenario: Add a note
		Given I add the note "Watch TV"
		Then I should see the note "Watch TV"
$ cat features/step_definitions/add_note_step.rb
require_relative "../../notepad.rb"

Given /^I add the note "(.*?)"$/ do |note|
	add note
end

Then /^I should see the note "(.*?)"$/ do |note|
	raise unless $notes.include? note
end