gistfile1.rbx

#!/usr/bin/env ruby
require "rubygems"
require "spec"

# aka Cheetah
class AcinonyxJubatus
  def speed_limit
    120
  end
end

module SlightlyUnresponsible
  def speed_limit
    :enforced_by_law_deep_inside
  end
end

# now lets try some biological engineering.
# Make a cheetah run like homo sapiens:
class AcinonyxJubatus
  include SlightlyUnresponsible
end

describe AcinonyxJubatus do
  before(:each) do
    @animal = AcinonyxJubatus.new
  end
  
  it 'cannot go faster than 120 km per hour' do
    @animal.speed_limit.should == 120
  end
end