Question Testing of shocks for warranty claim

[CHPMustang]

I and I'm sure a few other people would like to know if there's a mechanical or scientific way to test aftermarket shocks for failure like the valves are stuck or failed?

Is there a rig that the manufacturers have that may be used to validate warranties?

I spoke to a retailer for aftermarket shocks and they told me they just hold the shock and either retract or expand the shock by hand and they could tell what valve/s are stuck and/or failed

Anyone?

 

[big_rooster]

Think if i hand them my skyjacker steering stabilizer shocks they can tell whats wrong? Besides the great big dent in the side of it that i got rockcrawling today