public void DuplicateIdInEntityAttached() { v.Detach(); XmlElement a1 = doc.CreateElement("anchor"); a1.SetAttribute("id", "id1"); XmlEntityReference xer = doc.CreateEntityReference("test"); // no errors at this point (not added to doc yet) Assert.AreEqual(0, v.InvalidNodes.AllErrors.Length); doc.DocumentElement.AppendChild(a1); doc.DocumentElement.AppendChild(xer); v = new ValidationManager(); v.Attach(doc, null); Assert.AreEqual(2, v.InvalidNodes.AllErrors.Length, "Expected duplicate ids"); doc.DocumentElement.RemoveChild(a1); Assert.AreEqual(0, v.InvalidNodes.AllErrors.Length, "Errors remain after removing duplicate"); }