public function testRegistryWriteUser0MatchingVale()
 {
     // if user-key-value equals user-0-value, the user-key-value must be deleted on write
     $this->rm->registryWrite(0, 'key', 'name_int', 'int', self::_int);
     // user-0-value
     $this->rm->registryWrite(1, 'key', 'name_int', 'int', self::_int + 1);
     // user-key-value
     $r = $this->rm->registryRead(1, 'key', 'name_int', 'int');
     $this->assertEquals($r, self::_int + 1);
     $this->rm->registryWrite(1, 'key', 'name_int', 'int', self::_int);
     // this must delete the user-key-value
     //$r = $this->rm->registryRead(1, 'key', 'name_int', 'int');
     $r = $this->rm->registryExists(1, 'key', 'name_int', 'int');
     //$this->assertEquals($r, self::_int);
     $this->assertEquals($r, false);
     $this->rm->registryDelete(0, 'key', 'name_int', 'int');
 }