As far as I know, there is no holster test any longer. Not in the time I've been shooting, anyway.
The Hogue Powerspeed is a semi-auto holster with excellent retention, but we make a revolver adapter for it. The Hogue has a half-lock and a full-lock position. The half-lock is ideal for when you're on the line, ready to shoot, because you push it down with your thumb when you're drawing. It's pretty automatic.
I've tested an unloaded revolver in the Hogue with our adapter, upside-down (over a bed, just in case ) and have shaken it hard. I've never had a revolver come loose from it.
Our adapter will work for any revolver from a barrel length of 4" to 8 3/8", and for any caliber, including .22.
Here's a link to our post about it, and a link to our website products page. The holster modification kit is at the bottom of the page.