Name boundary cases when creating an order.

Boundary test cases when creating an order may include:

• Creating an order with the minimum allowable number of items (e.g., 1 unit).
• Creating an order with the maximum allowable number of items (limit testing).
• An order with empty or incorrect data (e.g., empty customer name, invalid phone format).
• An order missing required fields.
• An order with very long strings in fields (name, address).
• An order with non-standard characters or injections in fields.
• Attempting to create an order with an unavailable product or zero stock.
• An order with negative quantity or price.
• Creating an order outside of working hours or with an expired promotion.

Testing such cases helps identify data processing errors and system robustness.