You are right that sharing Buttons can be added easily.
Owners of the tests require mainly that the test participants receive a link, a link to its outcome. He can therefore save only a link, and important information is not lost him. I’d put him there and instructions on how to proceed, and links to other sites, which are only for the participants of the test.
He also can send the link via email to their friends with their own commentary. This is much better than sending a recommendation from a web form.
For you, this means that a larger amount of prospects to learn about your product that will grow exponentially.
If you look at online psychological tests
https://www.quora.com/What-is-the-most-accurate-free-online-Myers-Briggs-test
so they all have the result in the form of a hard link, where the outcome is stored or sent via email subscriber outcome in the form of html email or in the notes as a pdf.