Rule of thumb test (not with sport shocks though).
Push down on wing, it should rise and then dip slightly and settle. If you go in, have a cup of tea, watch Top Gear, come out and it's still impersonating Zebedee, then you gotta problem.
Note:
Might have slightly exaggerated the duration of time a kna**ered shock will bounce for. Just remember - push, rise, dip and settle.