Further spec greening

spec/serializers/suppliers/order_serializer_spec.rb

@@ -6,8 +6,8 @@ describe Suppliers::OrderSerializer, type: :serializer do
     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
+    expect{ result = described_class.serialize(order, include: %w[user]).deep_symbolize_keys }.not_to perform_any_queries
+    result[:included].size.should eq 1
   end
 
 end