2 files changed, 15 insertions, 0 deletions
diff --git a/activerecord/test/cases/scoping/named_scoping_test.rb b/activerecord/test/cases/scoping/named_scoping_test.rb
index ea71a5ce28..03f8a4f7c9 100644
--- a/activerecord/test/cases/scoping/named_scoping_test.rb
+++ b/activerecord/test/cases/scoping/named_scoping_test.rb
@@ -303,6 +303,13 @@ class NamedScopingTest < ActiveRecord::TestCase
     assert_equal "lifo", topic.author_name
   end
 
+  def test_deprecated_delegating_private_method
+    assert_deprecated do
+      scope = Topic.all.by_private_lifo
+      assert_not scope.instance_variable_get(:@delegate_to_klass)
+    end
+  end
+
   def test_reserved_scope_names
     klass = Class.new(ActiveRecord::Base) do
       self.table_name = "topics"
diff --git a/activerecord/test/models/topic.rb b/activerecord/test/models/topic.rb
index 8cd4dc352a..fa50eeb6a4 100644
--- a/activerecord/test/models/topic.rb
+++ b/activerecord/test/models/topic.rb
@@ -12,9 +12,17 @@ class Topic < ActiveRecord::Base
 
   scope :scope_with_lambda, lambda { all }
 
+  scope :by_private_lifo, -> { where(author_name: private_lifo) }
   scope :by_lifo, -> { where(author_name: "lifo") }
   scope :replied, -> { where "replies_count > 0" }
 
+  class << self
+    private
+      def private_lifo
+        "lifo"
+      end
+  end
+
   scope "approved_as_string", -> { where(approved: true) }
   scope :anonymous_extension, -> {} do
     def one