1 files changed, 8 insertions, 4 deletions
diff --git a/activerecord/test/cases/attribute_methods/read_test.rb b/activerecord/test/cases/attribute_methods/read_test.rb
index 0df9ffc0c5..98c38535a6 100644
--- a/activerecord/test/cases/attribute_methods/read_test.rb
+++ b/activerecord/test/cases/attribute_methods/read_test.rb
@@ -1,14 +1,11 @@
 require "cases/helper"
 require 'active_support/core_ext/object/inclusion'
+require 'thread'
 
 module ActiveRecord
   module AttributeMethods
     class ReadTest < ActiveRecord::TestCase
       class FakeColumn < Struct.new(:name)
-        def type_cast_code(var)
-          var
-        end
-
         def type; :integer; end
       end
 
@@ -20,6 +17,13 @@ module ActiveRecord
 
           include ActiveRecord::AttributeMethods
 
+          def self.define_attribute_methods
+            # Created in the inherited/included hook for "proper" ARs
+            @attribute_methods_mutex ||= Mutex.new
+
+            super
+          end
+
           def self.column_names
             %w{ one two three }
           end