public void Reserve_RequiresValidIdentifier()
        {
            var spaceRepositoryTestDouble = new SpaceRepositoryTestDouble();
            var reservationService        = new ReservationService(spaceRepositoryTestDouble);

            Assert.Throws <ArgumentException>(() => reservationService.Reserve(0));
        }
        public void Reserve_WhenSpaceDoesNotExist_ReturnsFalse()
        {
            var spaceRepositoryTestDouble = new SpaceRepositoryTestDouble();
            var reservationService        = new ReservationService(spaceRepositoryTestDouble);
            var result = reservationService.Reserve(1);

            Assert.False(result);
        }