leveraging Subject in RSpec - 1

address_spec.rb

describe Address do
  describe "#validations" do
    it "must have a city" do
      a = Address.new
      a.should_not be_valid
      a.errors_on(:city).should_not be_nil
    end

    it "must have a state" do
      a = Address.new
      a.should_not be_valid
      a.errors_on(:state).should_not be_nil
    end
        
    it "must have a country" do 
      a = Address.new
      a.should_not be_valid
      a.errors_on(:country).should_not be_nil
    end
  end
end