public function testHasNextSibling()
{
Table9Peer::doDeleteAll();
$t0 = new Table9();
$t1 = new Table9();
$t1->setTitle('t1')->setLeftValue(1)->setRightValue(6)->save();
$t2 = new Table9();
$t2->setTitle('t2')->setLeftValue(2)->setRightValue(3)->save();
$t3 = new Table9();
$t3->setTitle('t3')->setLeftValue(4)->setRightValue(5)->save();
$this->assertFalse($t0->hasNextSibling(), 'empty node has no next sibling');
$this->assertFalse($t1->hasNextSibling(), 'root node has no next sibling');
$this->assertTrue($t2->hasNextSibling(), 'not last sibling has a next sibling');
$this->assertFalse($t3->hasNextSibling(), 'last sibling has no next sibling');
}
