PropagateUpdatedOn does not trigger when adding new line about vita HOT 3 CLOSED

    // Investigating reported issue #202: PropagateUpdatedOn does not trigger when adding new line
    // Dec 2022 - so far no problem detected, works as expected without fixes

    [TestMethod]
    public void TestBugPropagateUpdatedOnAttr() {
      Startup.BooksApp.LogTestStart();

      var app = Startup.BooksApp;
      var session = app.OpenSession();

      // IBookOrderLine has [PropagateUpdateOn] on Order property. 
      // For an existing order, after we add/modify/delete any line, the parent Order's status should be Modified, and UpdatedOn field should be updated 
      //  on SaveChanges.

      // We create order with one book; save it; and then add another book - the BookOrder should be set to Modified
      var ferb = session.EntitySet<IUser>().First(u => u.UserName == "Ferb");
      var order = session.NewOrder(ferb);
      var csBook = session.EntitySet<IBook>().First(b => b.Title.StartsWith("c#"));
      order.Add(csBook, 1);
      session.SaveChanges();

      var orderRec = EntityHelper.GetRecord(order);
      Assert.AreEqual(EntityStatus.Loaded, orderRec.Status);
      var updOn = order.UpdatedOn;
      Thread.Sleep(100); // to make difference in UpdatedOn noticeable

      // now lets add another book and check the order status
      var vbBook = session.EntitySet<IBook>().First(b => b.Title.StartsWith("VB"));
      order.Add(vbBook, 1);
      // Check that order state changed to modified
      Assert.AreEqual(EntityStatus.Modified, orderRec.Status, "Expected Order status changed to Modified");
      session.SaveChanges();
      var newUpdOn = order.UpdatedOn;
      Assert.IsTrue(newUpdOn > updOn.AddMilliseconds(50), "Expected later new UpdatedOn value");
    }