add more test

src/e2ee/sharedKeyManagement.test.ts

@@ -0,0 +1,36 @@
+/*
+Copyright 2026 Element Creations Ltd.
+
+SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial
+Please see LICENSE in the repository root for full details.
+*/
+
+import { afterEach, describe, expect, test } from "vitest";
+
+import { getKeyForRoom, saveKeyForRoom } from "./sharedKeyManagement";
+
+const roomId = "!room:example.org";
+
+describe("getKeyForRoom", () => {
+  afterEach(() => {
+    window.location.hash = "#";
+    localStorage.clear();
+  });
+
+  test("prefers a key given in the parameters over the stored one", () => {
+    saveKeyForRoom(roomId, "stored");
+    window.location.hash = `#?roomId=${encodeURIComponent(roomId)}&password=from-the-link`;
+
+    expect(getKeyForRoom(roomId)).toBe("from-the-link");
+  });
+
+  test("falls back to the stored key", () => {
+    saveKeyForRoom(roomId, "stored");
+
+    expect(getKeyForRoom(roomId)).toBe("stored");
+  });
+
+  test("has no key to offer for a room it has never seen", () => {
+    expect(getKeyForRoom(roomId)).toBeNull();
+  });
+});