use strict;
use warnings;

use Test::More;

use DateTime;
use DateTime::Duration;

undef $ENV{PERL_DATETIME_DEFAULT_TZ};

{
    my $dt = DateTime->new( year => 2008, month => 2, day => 28 );
    my $du = DateTime::Duration->new( years => 1 );

    my $p;

    $p = $dt->set( year => 1882 );
    is( DateTime->compare( $p, $dt ), 0, 'set returns self' );

    $p = $dt->set_time_zone('Australia/Sydney');
    is( DateTime->compare( $p, $dt ), 0, 'set_time_zone returns self' );

    $p = $dt->add_duration($du);
    is( DateTime->compare( $p, $dt ), 0, 'add_duration returns self' );

    $p = $dt->add( years => 2 );
    is( DateTime->compare( $p, $dt ), 0, 'add returns self' );

    $p = $dt->subtract_duration($du);
    is( DateTime->compare( $p, $dt ), 0, 'subtract_duration returns self' );

    $p = $dt->subtract( years => 3 );
    is( DateTime->compare( $p, $dt ), 0, 'subtract returns self' );

    $p = $dt->truncate( to => 'day' );
    is( DateTime->compare( $p, $dt ), 0, 'truncate returns self' );

}

done_testing();