public function testDefault()
{
$t = new Table9();
$t->setTreeLeft('123');
$this->assertEquals($t->getLeftValue(), '123', 'nested_set adds a getLeftValue() method');
$t->setTreeRight('456');
$this->assertEquals($t->getRightValue(), '456', 'nested_set adds a getRightValue() method');
$t->setLevel('789');
$this->assertEquals($t->getLevel(), '789', 'nested_set adds a getLevel() method');
}