Testing a PFD is not something that you will be doing on a daily basis. In fact, experts only recommend that you check the working and condition of it once every year. And if you are getting a jacket from a theme park or a swimming pool that is well maintained, the chances are that it is already tested for safety. The easiest way to look for damages is a visual inspection. Look for any visible signs of disintegration or the presence of holes in the jacket. Also, check if the jacket has a proper fit when you wear it.