public function testDistanceBitStr()
{
$node_a = new Node();
$node_a->setIdHexStr('11111111-1111-4111-8111-111111111100');
$node_b = new Node();
$node_b->setIdHexStr('11111111-1111-4111-8111-111111111100');
$node_c = new Node();
$node_c->setIdHexStr('11111111-1111-4111-8111-111111111102');
$node_d = new Node();
$node_d->setIdHexStr('11111111-1111-4111-8111-111111111104');
$zeros = str_repeat('0', 120);
$this->assertEquals($zeros . '00000000', $node_a->distanceBitStr($node_b));
$this->assertEquals($zeros . '00000010', $node_a->distanceBitStr($node_c));
$this->assertEquals($zeros . '00000110', $node_c->distanceBitStr($node_d));
}
