Full example

example_spec.rb

describe BeersOnTheWall do
  Given(:beer_count){ 50 }
  describe "setting up the wall" do
    context "when we are too drunk to count" do
       Given(:beers){ BeersOnTheWall.new }
       Then{ expect(beers.count).to eql 100}
    end
    context "when we aint even been drinking yet" do
      Given(:beers){ BeersOnTheWall.new(beer_count) }
      Then{ expect(beers.count).to eql beer_count}
    end
  end
  describe "taking one down" do
    Given(:beers_on_the_wall){ BeersOnTheWall.new(beer_count) }
    When{ beers_on_the_wall.take_one_down }
    Then{ expect(beers_on_the_wall.count).to eql (beer_count - 1) }
  end