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use strict;
use warnings;
use Test::More;
use Parallel::ForkManager;
use BerkeleyDB;
use FindBin qw/$Bin/;
use Data::Dumper;
my $pm = new Parallel::ForkManager(4);
my $berkeleydb_temp_file = "$Bin/tmp.berkeleydb"; # temp file for BerkeleyDB
unlink($berkeleydb_temp_file) if -e $berkeleydb_temp_file;
my $db = tie my %data, 'BerkeleyDB::Hash',
-Filename => $berkeleydb_temp_file,
-Flags => DB_CREATE
or die "Cannot create file: $! $BerkeleyDB::Error\n";
foreach my $i (1 .. 1000) {
$pm->start and next; # do the fork
$data{$i} = $i * 2;
$pm->finish; # Terminates the child process
is(scalar(keys %data), 1000);