This class provides a simple but essential heartbeat cheack
on the VIES service as it's known to have availability issues.
/**
* @covers DragonBe\Vies\HeartBeat::isAlive
* @covers DragonBe\Vies\HeartBeat::connect
*/
public function testVerifyServicesIsDown()
{
$host = '127.0.0.1';
$port = -1;
HeartBeat::$testingEnabled = true;
HeartBeat::$testingServiceIsUp = false;
$hb = new HeartBeat($host, $port);
$result = $hb->isAlive();
$this->assertFalse($result);
}