lib/rspec/expectations/fail_with.rb in rspec-expectations-3.1.2 vs lib/rspec/expectations/fail_with.rb in rspec-expectations-3.2.0

@@ -22,11 +22,10 @@
         unless message
           raise ArgumentError, "Failure message is nil. Does your matcher define the " \
                                "appropriate failure_message[_when_negated] method to return a string?"
         end
 
-        diff = differ.diff(actual, expected)
-        message = "#{message}\nDiff:#{diff}" unless diff.empty?
+        message = ::RSpec::Matchers::ExpectedsForMultipleDiffs.from(expected).message_with_diff(message, differ, actual)
 
         raise RSpec::Expectations::ExpectationNotMetError, message
       end
     end
   end