When you finish creating your email template, you can test it before uploading it to Veeva and sending it to an HCP. This article explains how you can test an email template by exporting it as an Html email.
After you create the email template and set up the required details, go to the export page and select the option Html email to receive it in your email.
Please note that if you want to test the tokens you need to upload your email to Veeva. Otherwise, you will only see the raw tokens.
Take a look at the following video to get to know the full process of testing an email template.