At least before the fall of the republic, it was apparently common for Jedi Padawans to be locked in a cave to face a trial against their deepest fear to get a Kyber Crystal to even make their lightsaber in the first place. If they failed to conquer their fear, they died.

Edit: apparently they don’t die per se, but are meant to believe they will and also if they fail, they might be stuck there. It’s weird and still not ethical