Actually, the test was about Luke's patience and anger. He did not like what he saw in Luke, but he also knew that he had no choice. Events happened as the Force allowed them to. It is Luke and not Leia who came to Obi-wan to begin his journey. Yoda is concern because he doesn't want another Vader, but he also knows that the stakes are too high to not to. That is why he sighs and asks Ben if the boy will complete the training. Which he doesn't, which is why he points out that he is as reckless as he feared. And Obi-wan was filled with anger, in his youth. He did have a desire to be adventureous. Once upon a time, he craved the excitement that being a Jedi afforded him. Obi-wan himself was also reckless about other things. Such as taking on Anakin, whether the Council approved or not. He was reckless to believe that Anakin would turn out fine and would never betray them.