What I'd like is a way to check that the command will run properly. Waiting for one minute to test is not productive at all. And no, testing in your shell won't do, since cron runs in a particular environment.
Have you tried any of these answers?
http://stackoverflow.com/questions/2135478/how-to-simulate-t...
env - HOME=$HOME LOGNAME=$LOGNAME sh -c 'command line'
Home, shell and logname are the only 3 variables guaranteed to be set.You could simply find something else to do for a minute, like rechecking that the other pieces of the system are setup correctly as well.