# -*- mode: perl; -*-
use strict;
use warnings;
use Test::More tests => 2;
use Scalar::Util qw< refaddr >;
use Math::BigInt;
my ($x, $y);
note("bneg() as a class method");
$x = Math::BigInt -> bneg("2");
subtest '$x = Math::BigInt -> bneg("2");' => sub {
    plan tests => 2;
    is(ref($x), 'Math::BigInt', '$x is a Math::BigInt');
    cmp_ok($x, "==", -2, '$x == -2');
};
note("bneg() as an instance method");
$x = Math::BigInt -> new("2"); $y = $x -> bneg();
subtest '$x = Math::BigInt -> new("2"); $y = $x -> bneg();' => sub {
    plan tests => 4;
    is(ref($x), 'Math::BigInt', '$x is a Math::BigInt');
    is(ref($y), 'Math::BigInt', '$y is a Math::BigInt');
    cmp_ok($y, "==", -2, '$y == -2');
    is(refaddr($x), refaddr($y), '$x and $y are the same object');
};