gistfile1.txt

require 'test/unit'

module M
  def f
    CONSTANT + 1
  end
end

class C
  CONSTANT = 1
  include M
end

class D
  CONSTANT = 2
  include M
end


class TestIt < Test::Unit::TestCase
  def test_c
    assert_equal 2, C.new.f
  end

  def test_d
    assert_equal 3, D.new.f
  end
end