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# TestRole role:
package TestRole;
...
$c->add_something("123");
my @arr = $c->test_method();
print Dumper(\@arr) . "\n";

'TestRole' requires the method 'test_method' to be implemented by 'Con
+sumer'

    handles => {
        test_method => 'elements',
        add_something => 'push',
    },

sub add_something {
   my ($self, %args) = @_;
...
sub test_method {
   # add the 'elements' code here.
}