/**
  * @depends testConstruct
  */
 function testUserInfo()
 {
     $pdo = $this->getPDO();
     $backend = new Sabre_DAV_Auth_Backend_PDO($pdo);
     $this->assertNull($backend->getDigestHash('realm', 'blabla'));
     $expected = 'hash';
     $this->assertEquals($expected, $backend->getDigestHash('realm', 'user'));
 }