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");
}