public void GivenListOfRidesGenerateInvoice()
        {
            Ride        ride1 = new Ride(1, 1);
            Ride        ride2 = new Ride(2, 1);
            Ride        ride3 = new Ride(1, 1);
            List <Ride> rides = new List <Ride>();

            rides.Add(ride1);
            rides.Add(ride2);
            rides.Add(ride3);
            Assert.AreEqual(43.0d, invoiceGenerator.returnTotalFareForMultipleRides(rides));
            Assert.AreEqual(14.333333333333334d, invoiceGenerator.averagePerRide);
            Assert.AreEqual(3, invoiceGenerator.numberOfRides);
        }