added test containing equal signs

Author: HilolaRustam

Sprint-2/implement/querystring.test.js

@@ -31,4 +31,10 @@ test("decodes URL-encoded characters", () => {
     name: "John Doe",
     city: "New York",
   });
+});
+
+test("parses values containing =", () => {
+  expect(parseQueryString("token=abc=123")).toEqual({
+    token: "abc=123"
+  });
 });