public void ShouldGetAJourneyTime()
        {
            IPort portBuenosAires = _portRepository.GetPort("Buenos Aires");
            IPort portNy          = _portRepository.GetPort("New York");
            IPort portLiverpool   = _portRepository.GetPort("Liverpool");
            IPort portCasablanca  = _portRepository.GetPort("Casablanca");
            IPort portCapetown    = _portRepository.GetPort("Cape Town");

            var journey        = new Journey <IPort>(_routeRepository).WithPort(portBuenosAires).WithPort(portNy).WithPort(portLiverpool);
            var journey2       = new Journey <IPort>(_routeRepository).WithPort(portBuenosAires).WithPort(portCasablanca).WithPort(portLiverpool);
            var journey3       = new Journey <IPort>(_routeRepository).WithPort(portBuenosAires).WithPort(portCapetown).WithPort(portNy).WithPort(portLiverpool).WithPort(portCasablanca);
            var invalidjourney = new Journey <IPort>(_routeRepository).WithPort(portBuenosAires).WithPort(portCapetown).WithPort(portCasablanca);


            Assert.That(journey.GetTime(), Is.EqualTo(10));
            Assert.That(journey2.GetTime(), Is.EqualTo(8));
            Assert.That(journey3.GetTime(), Is.EqualTo(19));
            Assert.That(invalidjourney.GetTime(), Is.EqualTo(0));
        }