diff --git a/activerecord/test/cases/connection_pool_test.rb b/activerecord/test/cases/connection_pool_test.rb
index 55e90fd17244646e45049be739d70d9fbcf0df18..a45ee281c78c7514de0fb8fc28749bb1c8b4b65d 100644
--- a/activerecord/test/cases/connection_pool_test.rb
+++ b/activerecord/test/cases/connection_pool_test.rb
@@ -333,14 +333,13 @@ def test_pool_sets_connection_visitor
 
       # make sure exceptions are thrown when establish_connection
       # is called with an anonymous class
-#      def test_anonymous_class_exception
-#        anonymous = Class.new(ActiveRecord::Base)
-#        handler = ActiveRecord::Base.connection_handler
-#
-#        assert_raises(RuntimeError) {
-#          handler.establish_connection anonymous, nil
-#        }
-#      end
+      def test_anonymous_class_exception
+        anonymous = Class.new(ActiveRecord::Base)
+
+        assert_raises(RuntimeError) do
+          anonymous.establish_connection
+        end
+      end
 
       def test_pool_sets_connection_schema_cache
         connection = pool.checkout