#!/usr/bin/perl
use warnings;
use strict;

use Test::NoWarnings;
use Test::More tests => 2;

my $old = $SIG{__WARN__};
$SIG{__WARN__} = sub {
    my ($w) = @_;
    return if $w =~ /Eh/;

    warn $w;
    $old->(@_) if $old;
};

ok(1);

warn 'Eh';     # Will be ignored.
warn 'Error';  # Will be reported.