Class Attribute setter returns set value

Signed-off-by: Nwycats <wycats@gmail.com>

activesupport/lib/active_support/core_ext/class/attribute.rb

@@ -72,6 +72,7 @@ def self.#{name}=(val)
             remove_possible_method(:#{name})
             define_method(:#{name}) { val }
           end
+          val
         end
 
         def #{name}

activesupport/test/core_ext/class/attribute_test.rb

@@ -65,4 +65,9 @@ def setup
     object.singleton_class.setting = 'foo'
     assert_equal 'foo', object.setting
   end
+
+  test 'setter returns set value' do
+    val = @klass.send(:setting=, 1)
+    assert_equal 1, val
+  end
 end