System.Xml.Tests.TCValidateElement.StringPassedToValidateEndElementDoesNotSatisfyIdentityConstraints C# (CSharp) Method

        public void StringPassedToValidateEndElementDoesNotSatisfyIdentityConstraints()
        {
            Initialize();
            string xsd =
                "<xs:schema targetNamespace='http://tempuri.org/XMLSchema.xsd' elementFormDefault='qualified' xmlns='http://tempuri.org/XMLSchema.xsd' xmlns:mstns='http://tempuri.org/XMLSchema.xsd' xmlns:xs='http://www.w3.org/2001/XMLSchema'>" +
                    "<xs:element name='root'>" +
                        "<xs:complexType> <xs:sequence> <xs:element name='B' type='mstns:B'/> </xs:sequence> </xs:complexType>" +
                        "<xs:unique name='pNumKey'><xs:selector xpath='mstns:B/mstns:part'/><xs:field xpath='.'/></xs:unique>" +
                    "</xs:element>" +
                    "<xs:complexType name='B'><xs:sequence><xs:element name='part' maxOccurs='unbounded' type='xs:string'></xs:element></xs:sequence></xs:complexType>" +
                "</xs:schema>";

            XmlSchemaSet ss = new XmlSchemaSet();
            ss.Add(XmlSchema.Read(new StringReader(xsd), ValidationCallback));
            ss.Compile();

            string ns = "http://tempuri.org/XMLSchema.xsd";
            XmlNamespaceManager nsmgr = new XmlNamespaceManager(ss.NameTable);
            XmlSchemaValidator val = new XmlSchemaValidator(ss.NameTable, ss, nsmgr, XmlSchemaValidationFlags.ProcessIdentityConstraints);
            val.ValidationEventHandler += new ValidationEventHandler(ValidationCallback);
            val.Initialize();
            XmlSchemaInfo si = new XmlSchemaInfo();
            val.ValidateElement("root", ns, si);
            val.ValidateEndOfAttributes(si);
            val.ValidateElement("B", ns, si);
            val.ValidateEndOfAttributes(si);

            val.ValidateElement("part", ns, si);
            val.ValidateEndOfAttributes(si);
            val.ValidateText("1");
            val.ValidateEndElement(si);

            val.ValidateElement("part", ns, si);
            val.ValidateEndOfAttributes(si);
            val.ValidateEndElement(si, "1");

            val.ValidateElement("part", ns, si);
            val.ValidateEndOfAttributes(si);
            val.ValidateText("1");
            val.ValidateEndElement(si);

            val.ValidateEndElement(si);
            val.ValidateEndElement(si);

            Assert.Equal(warningCount, 0);
            Assert.Equal(errorCount, 2);
            return;
        }