We do also have memorial £5 coins here in the UK although I don't know if they are a test for anything, as there have been quite a few over the years. A common gift for people as they are quite large with nice designs on

Switzerland has been using the 5CHF coin for a long while now, and as an end user, my only issue with it is its size and weight, originating from the fact that the coins ranging from .50 to 5CHF are defined to linearly scale in weight.