Add a test for verboseName
Add a test for verboseName

Before touching the internals of reference representation, make sure
the expected values of verboseName are known so that we don't
break any users by touching the internals.

Signed-off-by: Miloslav Trmač <9c008e38982a5397deb855345fb164f0558459ae@redhat.com>

containers/image,containers/image