# File lib/email_spec/matchers.rb, line 206
      def failure_message
        if @expected_subject.is_a?(String)
          "expected the subject to be #{@expected_subject.inspect} but was #{@given_subject.inspect}"
        else
          "expected the subject to match #{@expected_subject.inspect}, but did not.  Actual subject was: #{@given_subject.inspect}"
        end
      end