Failing test method

        [TestMethod]
        public async void Book_Simple_Reservation_Successfully()
        {
            var teeTime = new DateTime(DateTime.Now.Year, DateTime.Now.Month, DateTime.Now.Day, 8, 0, 0).AddDays(1);

            var request = new BookReservationRequest
            {
                CourseId = 1,
                TeeTime = teeTime,
                NumberOfPlayers = 2,
                Email = "email@domain.com",
                FirstName = "First",
                LastName = "Last",
                PhoneNumber = "123-455-2412",
                RatePerPlayer = 123,
                PostPayAmountPerPlayer = 123
            };

            var response = await this.bookingMessageHandler.BookReservation(request, this.GetInvokeContext());

            Assert.AreEqual(123, response.ReservationId);
            Assert.AreEqual(Math.Abs("666".GetHashCode()).ToString(), response.ConfirmationNumber);
        }