Add tests

tests/DCC/AdministrativeData.Items.test.ts

@@ -4,7 +4,7 @@
  */
 
 import { select, toTextArr, toTextContentArr } from "../util";
-import { ItemType, DCCDocument, DCCXMLElement, IdentificationType } from "../../src";
+import { ItemType, DCCDocument, IdentificationType } from "../../src";
 
 const base = "//dcc:administrativeData/dcc:items";
 const xpath = {