It's okay if someone does some trading test as long as he'll do everything to get back the sold Bitcoins.
you are going to mislead newbies who are just getting started with bitcoin investment with this your statement above, because I don't see any reason why you will be saying that it's okay for someone to test trading if he/ she will do everything to get back the sold bitcoin, it is a very wrong advice and a misleading advice that you are giving to newbies who are just getting started with bitcoin investment, what you should be advising them is to stick to accumulating bitcoin to enable them accumulate a good portion of bitcoin to hold for long term 4 to 10 years or more and not advising them to test trading, because I don't know what they are testing trading for, unless you want them to get distracted with their bitcoin accusations journey.
How it can be misleading when everyone who aspires to become a good trader when I've just said that they can do their tests?
I agree about telling them to accumulate but you'll never know how hard headed the most of them and think that they can do it with trading.
But let them experience the brutality of the market and so they'll only stick to accumulation if they insist of trying to do some trades and tests.