use warnings;
use strict;

# UUT
use Scalar::Util qw/looks_like_number/;
sub verify_number {
	my ($arg) = @_;
	die "not a number" if !defined $arg;
	looks_like_number($arg) or die "not a number";
	return;
}

# wrap the funcs
my @funcs = qw/ verify_number /;
for my $f (@funcs) {
	my $orig = \&{$f};
	my $wrapped = sub { eval { $orig->(@_); 1 } };
	{ no strict 'refs'; *{$f.'_nf'} = $wrapped }
}

use Test::More tests => 4;

# helper
sub exception (&)
	{ eval { shift->(); 1 } ? undef : ($@ || die "\$@ was false") }

ok  !exception { verify_number("3.14") };
like exception { verify_number("foo")  }, qr/\bnot a number\b/i;

ok  verify_number_nf("3.14");
ok !verify_number_nf("foo");