The test script

use Test::More tests => 3;
ok(1, "Before");

BEGIN {
        package M;
        use TE;
        package main;
}
use TE;
use M;

exits_ok( sub {f()}, -2, "exits");
ok(1, "After");
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The M.pm module

package M;
use strict;
require Exporter;
use vars qw(@ISA @EXPORT);
@ISA = qw(Exporter);
@EXPORT = qw(f);

sub f {
        exit(-1);
}


1;
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The TE (short for Test::Exit ?) module

package TE;
use strict;
require Exporter;
use vars qw(@ISA @EXPORT);
@ISA = qw(Exporter);
@EXPORT = qw(exit exits_ok);

use Test::Builder;
my $Test = Test::Builder->new();


sub exit {
   my ($arg) = @_;
   $arg = '' if not defined $arg;
   die "EXIT$arg\n";
}

sub exits_ok (&$;$$) {
    my ($coderef, $expecting, $description) = @_;
    $expecting     = '' if not defined $expecting;
    $description ||= "exit $expecting";
    my $result;
    eval {&$coderef};
    my $ex = $@;
    $Test->ok($ex and $ex eq "EXIT$expecting\n", $description);
    if ($ex) {
        if ($ex =~ /^EXIT(.*)/) {
           if ($1 ne $expecting) {
              $Test->diag("Received '$1' expected '$expecting'");
           }
        } else {
           $Test->diag("died before reaching an exit statement");
        }
    }
}

1;
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