I just noticed that in all four of the tests for the Choice Activity, MDLQA-6723,MDLQA-6724, MDLQA-6725, and MDLQA-6726, it appears that not a single one of the tests calls for anyone to actually View Responses of the Choice results. Clicking on View Response gives a Fatal Error, whether or not the Choice is set for anonymous or non-anonymous results. I get the Fatal Error on qa.moodle.net and both of my own Moodle 2.7+Beta sites.

From my site:
Fatal error: Call to undefined method mod_choice\event\report_viewed::set_page_detail() in /var/www/moodle27/moodle/mod/choice/report.php on line 53 Call Stack: 0.0001 233000 1.

() /var/www/moodle27/moodle/mod/choice/report.php:0

From qa.moodle.net
Fatal error: Call to undefined method mod_choice\event\report_viewed::set_page_detail() in /var/www/vhosts/qa.moodle.net/html/mod/choice/report.php on line 53