Clear class ivar before testing

activerecord/test/cases/associations/belongs_to_associations_test.rb

@@ -605,6 +605,8 @@ def test_save_of_record_with_loaded_belongs_to
   end
 
   def test_dependent_delete_and_destroy_with_belongs_to
+    AuthorAddress.destroyed_author_address_ids.clear
+
     author_address = author_addresses(:david_address)
     author_address_extra = author_addresses(:david_address_extra)
     assert_equal [], AuthorAddress.destroyed_author_address_ids