Serializers now inherit attributes

test/serializers/attributes_test.rb

@@ -6,6 +6,11 @@ module ActiveModel
       def setup
         @profile = Profile.new({ name: 'Name 1', description: 'Description 1', comments: 'Comments 1' })
         @profile_serializer = ProfileSerializer.new(@profile)
+        @comment = Comment.new(id: 1, body: "ZOMG!!", date: "2015")
+        @serializer_klass = Class.new(CommentSerializer)
+        @serializer_klass_with_new_attributes = Class.new(CommentSerializer) do
+          attributes :date, :likes
+        end
       end
 
       def test_attributes_definition
@@ -23,6 +28,27 @@ module ActiveModel
                      @profile_serializer.attributes(fields: [:name, :description], required_fields: [:name]))
 
       end
+
+      def test_attributes_inheritance_definition
+        assert_equal([:id, :body], @serializer_klass._attributes)
+      end
+
+      def test_attributes_inheritance
+        serializer = @serializer_klass.new(@comment)
+        assert_equal({id: 1, body: "ZOMG!!"},
+                     serializer.attributes)
+      end
+
+      def test_attribute_inheritance_with_new_attribute_definition
+        assert_equal([:id, :body, :date, :likes], @serializer_klass_with_new_attributes._attributes)
+        assert_equal([:id, :body], CommentSerializer._attributes)
+      end
+
+      def test_attribute_inheritance_with_new_attribute
+        serializer = @serializer_klass_with_new_attributes.new(@comment)
+        assert_equal({id: 1, body: "ZOMG!!", date: "2015", likes: nil},
+                     serializer.attributes)
+      end
     end
   end
 end