Merge pull request #26707 from jcoleman/add_attribute_names_cache_busting_spec

Add test validating that Model.attribute_names cache is busted

activerecord/test/cases/attributes_test.rb

@@ -108,12 +108,14 @@ class CustomPropertiesTest < ActiveRecord::TestCase
 
       assert_equal 6, klass.attribute_types.length
       assert_equal 6, klass.column_defaults.length
+      assert_equal 6, klass.attribute_names.length
       assert_not klass.attribute_types.include?("wibble")
 
       klass.attribute :wibble, Type::Value.new
 
       assert_equal 7, klass.attribute_types.length
       assert_equal 7, klass.column_defaults.length
+      assert_equal 7, klass.attribute_names.length
       assert_includes klass.attribute_types, "wibble"
     end