public function testAccessLevelWithValueToAndFromStringShouldMatch()
 {
     $this->accessLevel->value = 'freebusy';
     $accessLevelXml = $this->accessLevel->saveXML();
     $newAccessLevel = new Extension\AccessLevel();
     $newAccessLevel->transferFromXML($accessLevelXml);
     $newAccessLevelXml = $newAccessLevel->saveXML();
     $this->assertTrue($accessLevelXml == $newAccessLevelXml);
     $this->assertEquals('freebusy', $newAccessLevel->value);
 }