Test::NoWarnings test 'no warnings' apparently inconsistant

[mandog]

I'm playing with  Test::NoWarnings.

When I test a sub from a module, that spits out warnings, Test::NoWarnings does not complain.

When I test a sub defined in the test file, test: 'no warnings' fails as i would expect.

What am I missing ?

See example code below

#!/usr/bin/perl -T  #  v5.8.8  (debian etch / ubuntu hardy)

use Test::More tests=>2;

# $VERSION .082 (ubuntu hardy)
# $VERSION eq .084 (cpan)
use Test::NoWarnings; 

use warnings;
use strict;

use lib qw| . |;
use foo;
# defined in foo.pm identical to get_match2
# does
# is(get_match(undef),undef,'undef gives undef');

# defined below, test 'no warnings' fails as I expect
is(get_match2(undef),undef,' match 2 undef gives undef');

sub get_match2 {
  my $match_me=shift;

  if ($match_me=~/(\d.+)/){
    return $1;
  } else{
    return undef;
  }
}

Contents of foo.pm

Package foo;
require Exporter;

our @ISA    = qw(Exporter);

our @EXPORT =
  qw(
      get_match
     );
sub get_match {
  my $match_me=shift;

  #
  if ($match_me=~/(.+)/){
    return $1;
  } else{
    return undef;
  }
}

1;

[pc88mxer]

It's not Test::NoWarnings fault. You'll get the warning if you use warnings in the file foo.pm.

[tachyon-II]

As noted you don't set warnings in your .pm, adding $^W++ in your .t test file will switch warnings on globally and thus make it behave as you desire.