Update checkout helper summing and add test coverage

app/helpers/checkout_helper.rb

@@ -19,7 +19,7 @@ module CheckoutHelper
     adjustments.reject! { |a| a.originator_type == 'EnterpriseFee' && a.source_type != 'Spree::LineItem' }
     unless exclude.include? :admin_and_handling
       adjustments << Spree::Adjustment.new(
-        label: I18n.t(:orders_form_admin), amount: enterprise_fee_adjustments.sum(:amount)
+        label: I18n.t(:orders_form_admin), amount: enterprise_fee_adjustments.sum(&:amount)
       )
     end
 

spec/helpers/checkout_helper_spec.rb

@@ -31,4 +31,29 @@ describe CheckoutHelper, type: :helper do
     order.distributor.allow_guest_orders = false
     expect(helper.guest_checkout_allowed?).to be false
   end
+
+  describe "#checkout_adjustments_for" do
+    let(:order) { create(:order_with_totals_and_distribution) }
+    let(:enterprise_fee) { create(:enterprise_fee, amount: 123) }
+    let!(:fee_adjustment) {
+      create(:adjustment, originator: enterprise_fee, adjustable: order, source: order)
+    }
+
+    before do
+      # Sanity check initial adjustments state
+      expect(order.adjustments.shipping.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
+      expect(adjustments).to include shipping_adjustment
+
+      admin_fee_summary = adjustments.last
+      expect(admin_fee_summary.label).to eq I18n.t(:orders_form_admin)
+      expect(admin_fee_summary.amount).to eq 123
+    end
+  end
 end