Update CheckoutHelper

app/helpers/checkout_helper.rb

@@ -7,7 +7,7 @@ module CheckoutHelper
     adjustments = order.adjustments.eligible
     exclude = opts[:exclude] || {}
 
-    adjustments = adjustments.to_a
+    adjustments = adjustments.to_a + order.shipment_adjustments.to_a
 
     # Remove empty tax adjustments and (optionally) shipping fees
     adjustments.reject! { |a| a.originator_type == 'Spree::TaxRate' && a.amount == 0 }

spec/helpers/checkout_helper_spec.rb

@@ -41,14 +41,14 @@ describe CheckoutHelper, type: :helper do
 
     before do
       # Sanity check initial adjustments state
-      expect(order.adjustments.shipping.count).to eq 1
+      expect(order.shipment_adjustments.count).to eq 1
       expect(order.adjustments.enterprise_fee.count).to eq 1
     end
 
     it "collects adjustments on the order" do
       adjustments = helper.checkout_adjustments_for(order)
 
-      shipping_adjustment = order.adjustments.shipping.first
+      shipping_adjustment = order.shipment_adjustments.first
       expect(adjustments).to include shipping_adjustment
 
       admin_fee_summary = adjustments.last