If you want to check how your campaigns will look like, you can send a test before the final mailing to make sure it is perfect.
Consider that for this you should have previously created a test segment containing your email and the emails of the rest of the team that want to receive tests.
In campaigns, once you have finished the 5 basic steps, you will see in the review and send step a button to send test.
Just click on this button and you will see that you will be given the option to select the segment to which you want to send the test.
You can also send a test from the email template without creating the campaign.
Please note that the links will not be functional: