You are looking at a very old, but free version of the course. If you are interesed the most recent version, check it out on the Perl Maven site.

6.22. Multiply - fixed

Example 6-15. examples/intro/t25_calc.t

use strict;
use warnings;

use Test::More tests => 1;

is `./mycalc "2 * 2"`, 4, '2*2';


$ perl t25_calc.t 
ok 1 - 2*2

If you are interested in on-site trainings by the author, please contact me directly.