Spec worked, links didn't :)

app/serializers/api/order_serializer.rb

@@ -23,8 +23,7 @@ class Api::OrderSerializer < ActiveModel::Serializer
     object.state ? object.state.humanize : nil # Or a call to t() here?
   end
 
-  delegate :order_url, to: Spree::Core::Engine.routes_url_helpers
   def path
-    order_url(object.number, only_path: true)
+    Spree::Core::Engine.routes_url_helpers.order_url(object.number, only_path: true)
   end
 end

spec/features/consumer/account_spec.rb

@@ -36,7 +36,8 @@ feature %q{
 
   it "reveals table of orders for distributors when clicked" do
     expand_active_table_node distributor1.name
-    expect(page).to have_content "Order " + d1o1.number.to_s
+    expect(page).to have_link "Order " + d1o1.number, href:"/orders/#{d1o1.number}"
+
     expand_active_table_node distributor2.name
     expect(page).not_to have_content "Order " + d1o1.number.to_s
   end