Moses and Exodus 35

As the Israelites continued their trek from Egypt to Mt. Sinai, they found themselves in another predicament: They were hungry! Maybe today we would call it "hangry" because they were hungry AND angry! They blamed Moses (again) for all their troubles and claimed (for the third time since leaving Egypt) that they were going to die and thought about how much better life was as slaves (true?). God heard them and once again showed them that He was much greater than Pharaoh by providing them with manna and with quail. God told them that the manna was a "test" for them. What kind of test?