As a followup of the informations I wrote in https://moodle.org/mod/forum/discuss.php?d=215159#p1299150
I notify you that the master branch of https://github.com/kordan/moodle-mod_surveypro has been renamed to MOODLE_31_STABLE on May 2 and all the behat tests of surveypro were successfully executed against it. They ALL passed using moodle core M31.
Current surveypro master already works fine in M32 BUT NOT WITH BOOST. All the behat tests run fine but only with --suite=clean. I am working to make them successfull with boost too.
If you use to update your surveypro copy pulling from master, be warned that from now on it will require moodle 3.2.
If you are using surveypro in M30 or M31, git pull from MOODLE_31_STABLE.