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use Test::More;
use strict; use warnings FATAL => 'all';
use List::Objects::WithUtils 'array';
my $first = array( qw/ a b c d e / );
my $second = array( qw/ c d x y / );
my $third = [ qw/ a b c d e f g / ];
my $intersects = $first->intersection($second, $third);
ok $intersects->count == 2, '2 items in intersection'
or diag explain $intersects;
is_deeply
[ $intersects->sort->all ],
[ qw/ c d / ],
'intersection looks ok'
or diag explain $intersects;
$intersects = $first->intersection($second);
ok $intersects->count == 2, '2 items in intersection';
is_deeply
[ $intersects->sort->all ],
[ qw/ c d / ],
'intersection (one array) looks ok';
ok $first->intersection( [ 1, 2, 3 ] )->is_empty,
'empty intersection ok';
my $dupes = array( qw/ z z c d / );
$intersects = $dupes->intersection($first);
is_deeply
[ $intersects->sort->all ],
[ qw/ c d / ],
'intersection (dupes in one array) ok';
ok array->intersection(array)->is_empty,
'empty array(s) intersection ok';
done_testing
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