public async Task postNewShift()
        {
            shiftController.PostNewShift(new S(9, 4, DateTime.Now, new List <U>()
            {
                new U(1, "Dave"), new U(2, "Steve"), new U(3, "Lisa")
            }));

            var shift = await shiftController.GetShift(9);

            shift.Should().NotBeNull();
            shift.id.Should().Be(9);
            shift.GetType().Should().Be(typeof(S));
        }