Rename attribute with :key (0.8.x compatibility)

test/serializers/attribute_test.rb

@@ -0,0 +1,23 @@
+require 'test_helper'
+
+module ActiveModel
+  class Serializer
+    class AttributeTest < Minitest::Test
+      def setup
+        @blog = Blog.new({ id: 1, name: 'AMS Hints' })
+        @blog_serializer = AlternateBlogSerializer.new(@blog)
+      end
+
+      def test_attributes_definition
+        assert_equal([:id, :title],
+                     @blog_serializer.class._attributes)
+      end
+
+      def test_json_serializable_hash
+        adapter = ActiveModel::Serializer::Adapter::Json.new(@blog_serializer)
+        assert_equal({:id=>1, :title=>"AMS Hints"}, adapter.serializable_hash)
+      end
+    end
+  end
+end
+