public function test_lock_key()
{
$this->mem->save(__METHOD__, 1);
$call = $this->mem->lock_key(__METHOD__, $l);
$this->assertTrue($call);
if ($call) {
$check = $this->mem->lock_key(__METHOD__, $l1);
$this->assertTrue(!$check)->addCommentary('key was not locked');
$this->mem->unlock_key($l);
}
}