public function testRegistryReadOnce()
{
// read once must remove the key after reading once
$this->rm->RegistryWrite(0, 'once_key', 'name_bln', 'bln', true);
$r = $this->rm->RegistryReadOnce(0, 'once_key', 'name_bln', 'bln');
$this->assertEquals($r, true);
//$r = $this->rm->RegistryRead(0, 'once_key', 'name_bln', 'bln'); // key must be gone
$r = $this->rm->RegistryKeyExists(0, 'once_key', 'name_bln', 'bln');
$this->assertEquals($r, false);
}