Add tests

tests/GP_Temperature/CharsXMLList.test.ts

+/**
+ * @jest-environment ./tests/XMLEnvironment.ts
+ * @xml ./tests/resources/GP_Temperature_v3.2.0_DCC.xml
+ */
+
+import { select } from "../util";
+import { DCCDocument } from "../../src";
+
+const base = "//dcc:quantity[@refType='test_charsXMLList']";
+const xpath = {
+  charsXMLList: `string(${base}/dcc:charsXMLList)`,
+};
+
+describe("CharsXMLList", () => {
+  let dcc: DCCDocument, dom, result;
+
+  beforeEach(() => {
+    ({ dcc, dom } = xmlEnv.recreateEnv());
+    result = dcc.digitalCalibrationCertificate.measurementResults.measurementResult[0].results.result[0];
+  });
+
+  test("should get correct charsXMLList from XML", () => {
+    expect(result.data.quantity[1].charsXMLList._text).toBe(select(xpath.charsXMLList, dom));
+  });
+});