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use Test::More;
use strict; use warnings FATAL => 'all';
use Lowu;
ok []->sort->is_empty, 'boxed empty array sort ok';
my $arr = [4, 2, 3, 1];
my $sorted = $arr->sort(sub { $_[0] <=> $_[1] });
is_deeply
[ $sorted->all ],
[ 1, 2, 3, 4 ],
'boxed sort ok';
my $warned;
$SIG{__WARN__} = sub { $warned = shift };
$sorted = $arr->sort(sub { $a <=> $b });
is_deeply
[ $sorted->all ],
[ 1, 2, 3, 4 ],
'boxed sort ok';
ok !$warned, 'using $a/$b produced no warnings'
or fail 'using $a/$b produced warning: '.$warned;
done_testing;
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