Helical LSD will act like an open diff off the ground (or when one wheel is unloaded), so wheels will turn opposite directions if one is spun with the car off the ground. However, if in gear and if one wheel is held/stopped, and the other is turned, there should be resistance to doing so. If its as easy to turn as when the other wheel is not stopped, then the LSD is not working.
Helical LSD's don't wear out though, i guess they could break or the gears could get damaged, but their function should not change over time like a Viscous or Mechanical / Clutch type LSD.
VLSD - in neutral both wheels unloaded both should turn the same way. One wheel held/stopped the other wheel should be difficult, to turn, but won't be super difficult to turn, should feel some resistance.
Mechanical - in neutral both wheels unloaded both should turn the same way. One wheel held/stopped the other wheel should be extremely difficult to move or maybe not be moved at all depending on the LSD function and preload.
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