py.test also can generate "errors"

Here is e.g. corresponding summary:

    ===== 12 failed, 14 passed, 4 xfailed, 12 error in 19.58 seconds =====
12 jobs for feat/more_args in 0 seconds (queued for 1 second)
Status Job ID Name Coverage
  External
failed nxdtest.UnitTest-Master.Python3

00:01:11

running nxdtest.UnitTest-Master.Python3

21357:08:54

failed nxdtest.UnitTest-Master.Python3

00:01:51

failed nxdtest.UnitTest-Master.Python3

00:01:19

failed nxdtest.UnitTest-Master.Python3

00:00:58

failed nxdtest.UnitTest-Master.Python3

00:02:06

failed nxdtest.UnitTest-Master.Python3

00:01:23

failed nxdtest.UnitTest-Master.Python3

00:01:33

failed nxdtest.UnitTest-Master.Python3

00:02:26

failed nxdtest.UnitTest-Master.Python3

00:02:35

failed nxdtest.UnitTest-Master.Python3

00:01:54

failed nxdtest.UnitTest-Master.Python3

00:01:19