Steps to reproduce:

1. Open URL: https://www.demoblaze.com/index.html

2. Pick one device and click on the name of the device.

3. Click on the “Add to cart” button in the new window.

4. At the top of the page, click on the “Cart” button.

5. Click on the “Place Order” button in the new window.

6. Fill in all the data in the pop-up and put the invalid credit card number (123).

7. At the pop-up bottom right, click on the “Purchase” button.

Expected results:

• You should get a notification that the credit card number is invalid and you can’t purchase the product.

Actual results:

• You can purchase the product. In the end, you get a notification with all data about the payment and with a “Thank you” message.