test the invoice number on the printed version

spec/system/admin/invoice_print_spec.rb

@@ -22,6 +22,7 @@
 
   let(:order) do
     create(:order_with_totals_and_distribution, user:, distributor:,
+                                                completed_at: 1.day.ago,
                                                 order_cycle:, state: 'complete',
                                                 payment_state: 'balance_due')
   end
@@ -462,12 +463,44 @@
   end
   context "when invoice feature is enabled" do
     before do
-      Flipper.enable(:invoice)
+      Flipper.enable(:invoices)
     end
     it_behaves_like "contains right Payment Description at Checkout information"
     it_behaves_like "Check display on each invoice: legacy and alternative", false
     it_behaves_like "Check display on each invoice: legacy and alternative", true
     it_behaves_like "order with tax"
+
+    context "Order doesn't have previous invoices" do
+      it "should display the invoice number" do
+        login_as_admin
+        visit spree.print_admin_order_path(order, params: {})
+
+        convert_pdf_to_page
+        expect(page).to have_content "#{order.distributor_id}-#{order.invoices.first.number}"
+      end
+    end
+
+    context "Order has previous invoices" do
+      before do
+        OrderInvoiceGenerator.new(order).generate_or_update_latest_invoice
+        first_line_item = order.line_items.first
+        order.line_items.first.update(quantity: first_line_item.quantity + 1)
+      end
+
+      it "should display the invoice number along with the latest invoice number" do
+        login_as_admin
+        visit spree.print_admin_order_path(order, params: {})
+
+        expect(order.invoices.count).to eq(2)
+
+        new_invoice_number = "#{order.distributor_id}-#{order.invoices.first.number}"
+        canceled_invoice_number = "#{order.distributor_id}-#{order.invoices.last.number}"
+
+        convert_pdf_to_page
+        expect(page).to have_content "#{new_invoice_number} cancels and replaces invoice #{
+          canceled_invoice_number}"
+      end
+    end
   end
 end