require 'spec_helper' describe Suppliers::OrderSerializer, type: :serializer do it "works" do user = create :user order = create :order, user: user order.product_orders # preload empty result = nil expect{ result = JSONAPI::Serializer.serialize order, serializer: described_class, include: %w[user user.order] }.not_to perform_any_queries result[:included].size.should eq 4 end end