public function testRetrieveRoot()
{
$this->assertTrue(method_exists('Table10Peer', 'retrieveRoot'), 'nested_set adds a retrieveRoot() method');
Table10Peer::doDeleteAll();
$t1 = new Table10();
$t1->setLeftValue(1);
$t1->setRightValue(2);
$t1->setScopeValue(2);
$t1->save();
$this->assertNull(Table10Peer::retrieveRoot(1), 'retrieveRoot() returns null as long as no root node is defined in the required scope');
$t2 = new Table10();
$t2->setLeftValue(1);
$t2->setRightValue(2);
$t2->setScopeValue(1);
$t2->save();
$this->assertEquals(Table10Peer::retrieveRoot(1), $t2, 'retrieveRoot() retrieves the root node in the required scope');
}
