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Invariant example
describe "taking one down" do
Given(:beers_on_the_wall){ }
Invariant{(beers_on_the_wall.count == "no more bottles of beers on the wall").should == (beers_on_the_wall.beers == 0)}
When{ beers_on_the_wall.take_one_down }
context "while we still have beers" do
Then{ expect(beers_on_the_wall.count).to eql (beer_count - 1) }
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