Is there anyway of adding verification to a form, such as an 'I am not a robot' test?

Yes, you are able to add a reCAPTCHA field to your form. We have four options to prevent SPAM submissions.

First one of these options is our CAPTCHA field which is located under the basic form elements. Please check our user guide: How to Add a Captcha Field

The second one is Google ReCAPTCHA widget.

The third one is Drawing CAPTCHA widget.

And as the last one is Unique Submissions on a Form. You can also add more striction to your form by Unique Submissions feature.

I hope one of these four alternatives meets your needs.