It's essential to test an automation flow, before you make it live for all of your customers to avoid errors and make sure everything runs smoothly.
For Chat Automation Flow
If it's a chat automation flow, you can add a keyword that only you know. Something like "Test-1234".
For eCom / Webhook Flow
If it's an ecommerce automation flow, then add a condition right after the trigger block, and in the condition check for your phone number. So only you will get the rest of the steps.
Make sure you're adding your phone number with the country-code and without the "+" sign in the condition.