public void DeletePeriod()
{
Period toDelete = repo.GetUniq(p => p.Title == "Remaining");
Assert.IsNotNull(repo.GetUniq(p => p.Title == "Remaining"));
repo.Delete(toDelete);
repo.Save();
Assert.IsNull(repo.GetUniq(p => p.Title == "Remaining"));
Assert.IsNull(ctx.PricePerPersonSet.FirstOrDefault(p => p.Title == "Prix adulte room1 reste de l'année"));
}