gistfile1.txt

class Duck
  def drink fluid
     bill.scoop(fluid)
  end
end

class Lion
  def drink fluid
     tongue.lap(fluid)
  end
end

class ZooKeeper
   def water animal
      animal.drink(WATER)
   end
end

#this doesn't help if I change the drink method 'interface'
describe Zookeeper, 'water' do
  it 'ensures animal is hydrated' do
    animal = fire_double("Animal") 
    animal.should_receive(:drink).with(WATER)
    Zookeeper.new.water(animal)
  end
end

#So instead I do this??? blech!
describe Zookeeper, 'water' do

  it 'ensures duck is hydrated' do
    animal = fire_double("Duck") 
    animal.should_receive(:drink).with(WATER)
    Zookeeper.new.water(animal)
  end

  it 'ensures lion is hydrated' do
    animal = fire_double("Lion") 
    animal.should_receive(:drink).with(WATER)
    Zookeeper.new.water(animal)
  end

end

# I find myself returning to the position that I will write integration tests to tell me when I 
# have incompatible assumptions about 'interfaces', not unit tests