#!/usr/bin/env perl

use strict;
use warnings;
use Rex::Test::Spec;

describe "CFEngine tests", sub
{
   context process( 'cf-exed' ), sub
   {
      like its( 'command' ), qr|\A(/var/cfengine/bin/)?cf-execd\Z|;
   };
};

done_testing;

Run it:
$ ./cfengine_test.pl 
Error loading Rex::Test::Spec::process. at /home/neil/perl5/perlbrew/perls/p