fix assertions

activesupport/test/descendants_tracker_test_cases.rb

@@ -43,7 +43,7 @@ module DescendantsTrackerTestCases
   protected
 
   def assert_equal_sets(expected, actual)
-    Set.new(expected) == Set.new(actual)
+    assert_equal Set.new(expected), Set.new(actual)
   end
 
   def mark_as_autoloaded(*klasses)
@@ -62,4 +62,4 @@ module DescendantsTrackerTestCases
     ActiveSupport::Dependencies.autoloaded_constants = old_autoloaded if defined? ActiveSupport::Dependencies
     ActiveSupport::DescendantsTracker.class_eval("@@direct_descendants").replace(old_descendants)
   end
-end
+end