Many Force Users (non-Sith and Sith alike) are wary of performing Force tests due to the risks of A/E. But there are a number on both sides (and those that prefer to think of themselves as being in the middle) that will do it. They just don't stand up, wave their arms, and shout "Look at me, I'm a Jedi, come get me!" So it can be very hard for a newcomer to the game to get tested. Once someone gets more established in the game, builds some contacts, builds some trust, etc, the chances of them finding someone to test them increase to a fairly decent level (for most people).
It should be noted that one of the more infamous cases of an arrest occuring during supposed testing was the arrest of a Sith. Or outcast Sith, or Dark Side user, or whatever term you want to apply to him.
This rumour about the Sith testing people and then A/Eing the Force sensitive people is one that I have heard before, but it's also one of those general rumours that never has a name attached to it. Most rumours you'll hear a name, or a faction. Something like "Oilios Katasterfor arrested a Sith during a Force test". So I am wary of the truth of this rumour. It may be propoganda, it may relate to a specific incident, or it may have been an idea someone threw around that didn't go anywhere.
As always, being careful who you trust is a definite must. For the person doing the testing AND the one being tested.
____________"May the Grace of Ara go with you, and His Vengeance be wrought upon your enemies."
Only fools and children dream of heroes.