Normal
Those "tearing" test lines (not anymore so much about the tearing since they wont fill the whole screen and people are quite educated to use AERO on Windows 7 or Exclusive DirectX on XP) are accurate. If they judder / stutter / tear it meas that there is some playback issue. Those lines are moved exactly the same amount between every single frame (not possible to have a bug in such calculation ). If the movement is not smooth then there is some issue - too bad that the lines itself cannot tell the source of the issue (it would be too easy ).