public function testSystemWriteDat()
 {
     $r = $this->rm->systemWrite('key', 'name_dat', 'dat', strtotime(self::_dat));
     $this->assertTrue($r, 'systemWrite not successful');
     $r = $this->rm->systemRead('key', 'name_dat', 'dat');
     $this->assertEquals(strtotime(self::_dat), $r);
 }