public async Task TryCreateReservationWithInvalidRoom() { var time = DateTime.Now; var newEndDate = new DateTime(time.Year, time.Month, time.Day); newEndDate = newEndDate.AddDays(1).AddHours(9).AddMinutes(30); if (time.DayOfWeek == DayOfWeek.Sunday) { time.AddDays(1); } Assert.AreEqual(-4, await _booking.CreateReservation(null, newEndDate, 1, dummyUser)); }