What does Genesis 44:21 mean?

Judah is making a plea to the Egyptian governor (Genesis 44:14–17). He speaks on behalf of his father Jacob, and his youngest brother Benjamin (Genesis 44:18–20). He reminds the vizier that he had demanded the brothers bring Benjamin to him so that he could look at him (Genesis 42:15). So far, he has not recognized that the man to whom he begs is his own brother, Joseph (Genesis 42:7–8), sold as a slave twenty years prior (Genesis 42:21–23).

At the time Joseph demanded to see Benjamin, Judah and his brothers thought this purpose was to prove they were not spies. Joseph's true motive in demanding to see Benjamin, however, was simply that he longed to set eyes on his brother again. He is also testing to see if his older brothers have changed since their despicable actions long ago (Genesis 37:24–28).