use DBM::Deep;
use Data::Dumper;
use Test::More no_plan => 1;

package Foo;

sub new { my $c = shift; bless { @_ }, $c }

package Bar;

sub new { my $c = shift; bless { @_ }, $c }

package main;

my $dbh = DBM::Deep->new( 'db.db' );

my $foo = Foo->new(
    bar => Bar->new( x => 1 ),
);

my $expected = Dumper( $foo );

$dbh->import( foo => $foo );

my $foo2 = $dbh->export( 'foo' );

my $actual = Dumper( $foo2 );

is( $actual, $expected );