public function testCanBeGenerated()
 {
     $containerId = ContainerTrackingNumber::generate();
     $this->assertNotNull((string) $containerId);
 }
 public function registerContainer()
 {
     return ContainerTrackingNumber::generate();
 }
 public function testLocationCanBeRetrieved()
 {
     $trackingNumber = ContainerTrackingNumber::generate();
     $tracker = new ContainerTrackingReader();
     $this->assertInstanceOf(Location::class, $tracker->locateContainer($trackingNumber));
 }