public void ScheduledYesterday_ReturnsFalse()
            {
                var shipment = new ShipmentBuilder()
                               .EstimatedArrivalDate(DateTime.Today.AddDays(-1))
                               .Build();

                Assert.That(shipment.IsScheduledForDeliveryToday(), Is.False);
            }
            public void ScheduledToday_ReturnsTrue()
            {
                var shipment = new ShipmentBuilder()
                               .EstimatedArrivalDate(DateTime.Today)
                               .Build();

                Assert.That(shipment.IsScheduledForDeliveryToday(), Is.True);
            }