If an optional filter expression is provided, it only returns the node
if it matches the given expression.
/**
* @test
*/
public function prevWillReturnFirstNodeAndSecondNodeInLevelForSecondAndThirdNodeInLevel()
{
$context = array($this->secondNodeInLevel, $this->thirdNodeInLevel);
$q = new FlowQuery($context);
$operation = new PrevOperation();
$operation->evaluate($q, array());
$output = $q->getContext();
$this->assertEquals(array($this->firstNodeInLevel, $this->secondNodeInLevel), $output);
}
