public function testExtractOnMixedKeys()
{
$mixedKeys = array('User' => array(0 => array('id' => 4, 'name' => 'Neo'), 1 => array('id' => 5, 'name' => 'Morpheus'), 'stringKey' => array()));
$expected = array('Neo', 'Morpheus');
$result = Set::extract($mixedKeys, '/User/name');
$this->assertEqual($expected, $result);
}