diff --git a/src/__tests__/TuitioAuthentication.test.ts b/src/__tests__/TuitioAuthentication.test.ts
index e636416..c885de0 100644
--- a/src/__tests__/TuitioAuthentication.test.ts
+++ b/src/__tests__/TuitioAuthentication.test.ts
@@ -3,7 +3,7 @@
  */
 
 import axios from "axios";
-import { TuitioClient } from "../client";
+import { TuitioClient, fetch, invalidate } from "../client";
 
 jest.mock("axios");
 
@@ -22,4 +22,11 @@ test("Tuitio client authentication", async () => {
   expect(result.token.validFrom).toStrictEqual(new Date("10/02/2023"));
   expect(result.token.validUntil).toStrictEqual(new Date("11/02/2023"));
   expect(result.status).toBe("_MOCK_");
+
+  const storage = fetch();
+  expect(storage.userName).toBe("user");
+
+  invalidate();
+  const emptyStorage = fetch();
+  expect(emptyStorage.userName).toBeNull();
 });