Fix label for other adjustments and add spec correspodingly

app/views/spree/order_mailer/_order_summary.html.haml

@@ -45,6 +45,8 @@
         %td{align: "right", colspan: "3"}
           - if adjustment.originator_type == "Voucher"
             = t(:email_order_summary_voucher_label, code: adjustment.label)
+          - else
+            = "#{adjustment.label}:"
         %td{align: "right"}
           = adjustment.display_amount
     %tr

spec/mailers/order_mailer_spec.rb

@@ -257,4 +257,30 @@ RSpec.describe Spree::OrderMailer do
       end
     end
   end
+
+  context "display adjustments" do
+    let(:order) { create(:order_with_totals_and_distribution, :completed) }
+    let(:voucher) { create(:voucher, enterprise: order.distributor) }
+
+    before do
+      voucher.create_adjustment(voucher.code, order)
+      OrderManagement::Order::Updater.new(order).update_voucher
+    end
+
+    let!(:confirmation_email_for_customer) { Spree::OrderMailer.confirm_email_for_customer(order) }
+    let!(:confirmation_email_for_shop) { Spree::OrderMailer.confirm_email_for_shop(order) }
+    let!(:cancellation_email) { Spree::OrderMailer.cancel_email(order) }
+
+    it "includes Voucher text with label" do
+      expect(confirmation_email_for_customer.body).to include("Voucher (#{voucher.code}):")
+      expect(confirmation_email_for_shop.body).to include("Voucher (#{voucher.code}):")
+      expect(cancellation_email.body).to include("Voucher (#{voucher.code}):")
+    end
+
+    it "includes Shipping label" do
+      expect(confirmation_email_for_customer.body).to include("Shipping:")
+      expect(confirmation_email_for_shop.body).to include("Shipping:")
+      expect(cancellation_email.body).to include("Shipping:")
+    end
+  end
 end