I had investigate and if I look at the unit tests result page, I can see that some unit tests are not green but yellow and blinking like if they are still running. But depending on the build, it's not always the same tests.
on 15 Mar, 2017 03:39 PM
I'm having the same/similar issue.
My build was successful and the log states no failed or skipped tests but when going to the Tests tab on the AppVeyor website some are marked yellow.
Also, no duration is shown for those tests.