What is JotForm?
JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
At JotForm, we want to make sure that you’re getting the online form builder help that you need. Our friendly customer support team is available 24/7.
We believe that if one user has a question, there could be more users who may have the same question. This is why many of our support forum threads are public and available to be searched and viewed. If you’d like help immediately, feel free to search for a similar question, or submit your question or concern.
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If I understand your concern correctly you want a site or program that will automatically test your signup form. If so, I tried to research this in google, however I did not find any good site that will help you with this. I think you will need a custom programming code on your site to have this. You may also try to check this link.
Do let us know if you need further assistance.