One of the new students asked a question about testing and Shihan gave a detailed answer. He walked through all the expectations, history, vocabulary, techniques, optional techniques, bokken and jo katas, and randori.
By the time he had finished, the idea of testing for yonkyu seemed daunting. Shodan? Hard to imagine.
Since you can neither ask to test, nor refuse, all you can do is train. I tell myself that if it doesn't matter what color your belt is, then it doesn't matter if it's black.