Add helper to view spec to make it work in rails 5

spec/views/spree/shared/_order_details.html.haml_spec.rb

@@ -1,10 +1,12 @@
 # frozen_string_literal: true
 
 require "spec_helper"
-
+require 'checkout_helper'
 describe "spree/shared/_order_details.html.haml" do
   include AuthenticationHelper
   helper Spree::BaseHelper
+  helper CheckoutHelper
+  helper OrderHelper
 
   let(:order) { create(:completed_order_with_fees) }
 
@@ -12,7 +14,7 @@ describe "spree/shared/_order_details.html.haml" do
     assign(:order, order)
     allow(view).to receive_messages(
       order: order,
-      current_order: order,
+      current_order: order
     )
   end