Add spec for proc methods with optional arguments

Author: Erol

spec/lib/object_serializer_class_methods_spec.rb

@@ -235,14 +235,15 @@
       before do
         movie.release_year = 2008
         MovieSerializer.attribute :released_in_year, &:release_year
+        MovieSerializer.attribute :name, &:local_name
       end
 
       after do
         MovieSerializer.attributes_to_serialize.delete(:released_in_year)
       end
 
       it 'returns correct hash when serializable_hash is called' do
-        expect(serializable_hash[:data][:attributes][:name]).to eq movie.name
+        expect(serializable_hash[:data][:attributes][:name]).to eq "english #{movie.name}"
         expect(serializable_hash[:data][:attributes][:released_in_year]).to eq movie.release_year
       end
     end

spec/shared/contexts/movie_context.rb

@@ -54,6 +54,10 @@ def cache_key
         "#{id}"
       end
 
+      def local_name(locale = :english)
+        "#{locale} #{name}"
+      end
+
       def url
         "http://movies.com/#{id}"
       end