I noticed this was taking an argument but not dealing with it. In
general the functions were undocumented, so I added some terse usage.
Also, the intent of the test-case was to expand the values before
using them as the message; make sure this happens by using a temp
variable.
Change-Id: Ib317ad1e9dd2a5d2232b9c64541fe4a601a2b8da