For a proper test, do the following:
Enter the store, and ask the nearest person where the cereal is.
If they say, "in the cereal aisle," ask where it is. If they tell you the aisle number, ask if you have to count the aisles, or if they are pre-numbered.
Move on to the next person. Ask the same questions, only this time, when they tell you the aisle number, ask them to take you there.
After everyone tells you to f##k off, you'll eventually find someone to walk you to the aisle. When they do, immediately sit down in one of those wheelchair carts and ask them to push you to the aisle.
When you get to the aisle, you must of course ask the person to get a box of cereal down, and you must start reading the box. Then, when you are done, hand it back, saying "that won't work," and ask for the next cereal box. Keep this up until he/she throws the box at your head.
Continue with the next person willing to help you. Be patient, as this will take some time.
Once you have found the cereal you need, see if you can get the person to follow you home and pour your cereal for you. As an added bonus, see if they will feed you.
Assuming you make it this far, immediately spit it out in disgust, and exclaim "that tastes like s##t!", and start the process over by going back to the store.