# File lib/email_spec/matchers.rb, line 214
      def failure_message_when_negated
        if @expected_subject.is_a?(String)
          "expected the subject not to be #{@expected_subject.inspect} but was"
        else
          "expected the subject not to match #{@expected_subject.inspect} but #{@given_subject.inspect} does match it."
        end
      end