use strict;
use warnings;
use lib 't/lib';
use Std;
{
  my $a = [];
  check_test(
    sub {
      cmp_deeply($a."", $a);
    },
    {
      actual_ok => 0,
      diag => <<EOM,
Compared reftype(\$data)
   got : undef
expect : 'ARRAY'
EOM
    },
    "stringified ref not eq"
  );
  check_test(
    sub {
      cmp_deeply(undef, "");
    },
    {
      actual_ok => 0,
      diag => <<EOM,
Compared \$data
   got : undef
expect : ''
EOM
    },
    "undef ne ''"
  );
  check_test(
    sub {
      cmp_deeply([$a."", ["b"]], [shallow($a), ["b"]]);
    },
    {
      actual_ok => 0,
      diag => <<EOM,
Compared \$data->[0]
   got : '$a'
expect : $a
EOM
    },
    "shallow not eq"
  );
  check_test(
    sub {
      cmp_deeply([$a, ["b"]], [shallow($a), ["a"]]);
    },
    {
      actual_ok => 0,
      diag => <<EOM,
Compared \$data->[1][0]
   got : 'b'
expect : 'a'
EOM
    },
    "deep after shallow not eq"
  );
}