I don't know what they're about, but since Yoda said Anakin was a Jedi (powerful Jedi was he), he probably took the Trials and succeeded.
So, what are these trials about? I'm guessing an important part of the ritual consists in facing your fear and anger so that you learn how to resist the temptation of the Dark Side.
Luke failed his test in the Cave, and later on he passed it when he chose to spare Vader's life. Obi-Wan seemed to be extremely angry in EP1 during his duel with Darth Maul. Yoda said dark emotions might help in a fight but are likely to dominate you. Obi-Wan eventually managed to control his emotions and even though he DID kill Maul, he didn't do it in a cruel manner or having him defenseless, not even for the pleasure of it.
Any comments on this?