Add 'Voucher:' before voucher code on edit cart page. Add spec correspondigly

spec/views/spree/orders/edit.html.haml_spec.rb

@@ -31,4 +31,28 @@ RSpec.describe "spree/orders/edit.html.haml" do
       expect(rendered).to have_selector(".unit-price")
     end
   end
+
+  describe "display adjustments" do
+    let(:voucher) { create(:voucher, enterprise: order.distributor) }
+
+    before do
+      voucher.create_adjustment(voucher.code, order)
+      OrderManagement::Order::Updater.new(order).update_voucher
+      render
+    end
+
+    it "includes Voucher text with label" do
+      expect(rendered).to include("Voucher: #{voucher.code}")
+    end
+
+    # shipping fee is derived from 'completed_order_with_fees' factory, it applies when using shipping method such as Home Delivery.
+    it "includes Shipping label" do
+      expect(rendered).to include("Shipping")
+    end
+
+    # transaction fee is derived from 'completed_order_with_fees' factory, it applies when using payment methods such as Check & Stripe.
+    it "includes Transaction fee label" do
+      expect(rendered).to include("Transaction fee")
+    end
+  end
 end