What does Exodus 16:4 mean?

Then the Lord told Moses, 'I’m going to send bread down from the sky for you. The people can go out each day and gather just enough for that day. I’m doing this to see if they’ll actually listen to me and follow my instructions.' Exodus 16:4 - Modern Text Bible

(God responds to their complaints with a promise to provide food, but also uses this as a test to see if they’ll trust and obey him.)