Adds coverage on invoices section/table

spec/system/admin/order_spec.rb

@@ -1016,15 +1016,69 @@ describe '
         let!(:order1) {
           create(:order_with_totals_and_distribution, user: user, distributor:,
                                                       order_cycle: order_cycle, state: 'complete',
-                                                      payment_state: 'balance_due')
+                                                      payment_state: 'balance_due',
+                                                      customer_id: customer.id)
         }
-        before do
-          visit spree.edit_admin_order_path(order1)
+
+        context "editing the order" do
+          before do
+            visit spree.edit_admin_order_path(order1)
+          end
+
+          it "displays the invoice tab" do
+            expect(page).to have_content "Complete".upcase
+            expect(page).to have_content "Invoices".upcase
+          end
         end
 
-        it "displays the invoice tab" do
-          expect(page).to have_content "Complete".upcase
-          expect(page).to have_content "Invoices".upcase
+        context "visiting the invoices tab" do
+          let!(:table_header) {
+            [
+              "Date/Time",
+              "Invoice Number",
+              "Amount",
+              "Status",
+              "File",
+            ].join(" ").upcase
+          }
+
+          let(:table_contents) {
+            [
+              Invoice.first.created_at.strftime('%B %d, %Y 12:00 AM').to_s,
+              "1",
+              "0.0",
+              "Active",
+              "Download"
+            ].join(" ")
+          }
+          let(:download_href) {
+            "#{spree.print_admin_order_path(order1)}?invoice_id=#{Invoice.last.id}"
+          }
+
+          before do
+            visit spree.admin_order_invoices_path(order1)
+          end
+
+          it "displays the invoices table" do
+            # with no invoices, only the table header is displayed
+            expect(page).to have_css "table.index"
+            expect(page).to have_content "#{customer.first_name} #{customer.last_name} -"
+            expect(page.find("table").text).to have_content(table_header)
+
+            # the New invoice button should be visible
+            expect(page).to have_link "New Invoice"
+            click_link 'New Invoice'
+
+            # and disappear after clicking
+            expect(page).to have_no_link "New Invoice"
+
+            # creating an invoice, displays a second row
+            expect(page.find("table").text).to have_content(table_contents)
+
+            # with a valid invoice download link
+            expect(page).to have_link("Download",
+                                      href: download_href)
+          end
         end
       end