public function testFailedQuery()
{
$params = TestUtil::getControllerParams();
$driver = $this->getDriver();
$link = $driver->connect($params, $params['username'], $params['passwd']);
/* @var $link \mysqli */
$processid = $link->thread_id;
$link->kill($processid);
$expr = $this->getMock('\\Repo2\\QueryBuilder\\ExpressionInterface');
$expr->expects($this->once())->method('compile')->will($this->returnValue('SELECT 1'));
$driver->query($link, $expr);
}