1. Check that whether the machine works when empty. If yes report an error. 2. Check that whether the machine works, if user enters a higher value coin. 3. Check that whether the machine works, if user enters a lower value coin. 4. Check that whether the machine works, if user enters a foreign currency coin. 5. Check that whether the machine works, if user enters a fake coin. 6. Check that whether the machine works, if user presses both half cup button and full cup button at once. 7. Check that whether the machine works, if user presses all buttons at once. 8. Check that whether the machine works, if user places the machine upside down. 9. Check that whether the machine works, if user place it horizontally. 10. Check that whether the machine stops working, if user stops working if user tries to open the cover while pouring coffee. 11. Check that whether the machine works, if user pulls out the cord after inserting the command, and then plug it again. 12. Check that whether a user can open the compartment with a fake key. 13. Check that whether the machine works with the competitor's ingredient. 14. Check that whether the machine is FIS and ISI approved. 15. Check that whether the machine can give shock, if touched with bare hands and feets on the floor.