You would just want to make sure you are checking the correct email account. The test email is sent from your connected email account within Uptics to your registered/login email address.
In case you have not received the email, you would want to look for the same in your spam box.
Using this feature, you have the ability to select a 'Contact' from your list that you would like to view the email as.
The purpose of this feature, choosing a contact does not actually send to the contact but allows you to view the email from the perspective of the contact record wherein you can see how the (tags, merge fields, variables, etc) come together before making any bulk sends.