do you think it would be a slap in the face to "follow procedure" or formality and have Naruto take a test? I think it is about confidence, and you do have a point to question the significance of titles. Following such formalities might make the acquisition of the title more significant. Naruto offering to buy Kakashi noodles could have been the clincher. Heading out to help sand, and gaaras impact on him could also be important. Anyway, if naruto does anything more extravant than something to do with food, it probably doesn't need to be in the anime. We'll see though.