An evil hack

gistfile1.rb

require 'test/unit'
class Funky
  def self.datehack(a=1, b=a+1)
    b
  end
  def self.evildatehack(a=b+1, b=1)
    a
  end
end

class ArgHack < Test::Unit::TestCase
  def test_date_hack
    assert_equal 2, Funky.datehack
    assert_equal 4, Funky.datehack(3)
  end
  def test_evildate_hack
    assert_raise  NameError do
      assert_equal 2, Funky.evildatehack
    end
  end

end