adds integration test for reservations for user with invoicing disabled

test/integration/reservations/create_as_admin_test.rb

@@ -7,6 +7,45 @@ module Reservations
       login_as(@admin, scope: :user)
     end
 
+    test "user without subscription and with invoicing disabled reserves a machine with success" do
+      @user_without_subscription.update!(invoicing_disabled: true)
+      machine = Machine.find(6)
+      availability = machine.availabilities.first
+
+      reservations_count = Reservation.count
+      invoice_count = Invoice.count
+      invoice_items_count = InvoiceItem.count
+      users_credit_count = UsersCredit.count
+
+      post reservations_path, { reservation: {
+          user_id: @user_without_subscription.id,
+          reservable_id: machine.id,
+          reservable_type: machine.class.name,
+          slots_attributes: [
+            { start_at: availability.start_at.to_s(:iso8601),
+              end_at: (availability.start_at + 1.hour).to_s(:iso8601),
+              availability_id: availability.id
+            }
+          ]
+        }}.to_json, default_headers
+
+      # general assertions
+      assert_equal 201, response.status
+      assert_equal reservations_count + 1, Reservation.count
+      assert_equal invoice_count, Invoice.count
+      assert_equal invoice_items_count, InvoiceItem.count
+      assert_equal users_credit_count, UsersCredit.count
+
+      # reservation assertions
+      reservation = Reservation.last
+
+      refute reservation.invoice
+      assert reservation.stp_invoice_id.blank?
+
+      # notification
+      assert_not_empty Notification.where(attached_object: reservation)
+    end
+
     test "user without subscription reserves a machine with success" do
       machine = Machine.find(6)
       availability = machine.availabilities.first