When Michael Pineda’s shoulder went out last spring, the Yankees had Freddy Garcia — and eventually Andy Pettitte — to fill the void. When Brett Gardner kept having setbacks, Raul Ibanez was available to play left field. When Alex Rodriguez broke his hand, Eric Chavez was a ready replacement. “I don’t think you really know how good your depth is until you get tested,” Joe Girardi said. “And then, once you go through what we went through last year, we found out it was pretty good.