2/2 test cases complete: 56 passes, 0 fails and 0 exceptions.
If you don't, there is probably a bug in the system. If the tests past, it is more likely to be a problem with your particular question.
You were right - I got the following error
Fail: question/type/numerical/simpletest/testquestiontype.php / ► / ►
Bad GroupTest [C:\MoodleWindowsInstaller-latest-18\moodle\moodle/question/type/numerical/simpletest/testquestiontype.php] with error [Creating default object from empty value]
Assuming this is causing my wildcard error, though I haven't the slightest idea what to do about it