Merge pull request #23990 from kamipo/remove_duplicated_test_prefix

Remove duplicated `test_` prefix [ci skip]

activerecord/test/cases/associations/belongs_to_associations_test.rb

@@ -726,7 +726,7 @@ def test_cant_save_readonly_association
     assert companies(:first_client).readonly_firm.readonly?
   end
 
-  def test_test_polymorphic_assignment_foreign_key_type_string
+  def test_polymorphic_assignment_foreign_key_type_string
     comment = Comment.first
     comment.author   = Author.first
     comment.resource = Member.first

activesupport/test/core_ext/module_test.rb

@@ -333,7 +333,7 @@ def test_local_constants
     end
   end
 
-  def test_test_local_constants_is_deprecated
+  def test_local_constants_is_deprecated
     assert_deprecated { Ab.local_constants.sort.map(&:to_s) }
   end
 end