ruby on rails - Check if attribute contains 2 letters in RSpec -

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what right way test if field contains 2 letter string rspec ? following old example guess worked in rails 2. creates new address instance, sets invalid value on it, , trigger valid? on instance , checks if errors report wrong.

  'requires state of length 2'       subject = address.new       subject.state = 'cal'       should_not be_valid       subject.errors.on(:state).should_not be_nil     end

now, rails 3 doesn't have errors.on, tried 

subject.errors[:state].should_not be_nil

but problem here errors[:attribute] empty array instead of nil.

you can still 

subject.errors[:state].should_not be_empty

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