# RSpec's subject method, both implicitly and explicitly set, is useful for
# declaratively setting up the context of the object under test. If you provide a
# class for your describe block, subject will implicitly be set to a new instance
# of this class (with no arguments passed to the constructor). If you want
# something more complex done, such as setting arguments, you can use the
# explicit subject setter, which takes a block.
describe Person do
  context "born 19 years ago" do
    subject { Person.new(:birthdate => 19.years.ago }
    it { should be_eligible_to_vote }
    its(:age) { should == 19 }
    it "should be younger than a 20 year old" do
      twenty_year_old = Person.new(:birthday => 20.years.ago)
      subject.should be_younger_than(twenty_year_old)
    end
  end
end