feat: show call participants in room list (Discord-style)

apps/web/test/unit-tests/PosthogTrackers-test.ts

@@ -0,0 +1,35 @@
+/*
+Copyright 2026 Element Creations Ltd.
+
+SPDX-License-Identifier: AGPL-3.0-only OR GPL-3.0-only OR LicenseRef-Element-Commercial
+Please see LICENSE files in the repository root for full details.
+*/
+
+import { PosthogAnalytics } from "../../src/PosthogAnalytics";
+import PosthogTrackers from "../../src/PosthogTrackers";
+
+describe("PosthogTrackers", () => {
+    afterEach(() => {
+        jest.resetAllMocks();
+    });
+
+    it("tracks URL Previews", () => {
+        jest.spyOn(PosthogAnalytics.instance, "trackEvent");
+        const tracker = new PosthogTrackers();
+        tracker.trackUrlPreview("$123456", false, [
+            {
+                image: {},
+            },
+        ]);
+        tracker.trackUrlPreview("$123456", false, [{}]);
+        // Ignores subsequent calls.
+        expect(PosthogAnalytics.instance.trackEvent).toHaveBeenCalledWith({
+            eventName: "UrlPreviewRendered",
+            previewKind: "LegacyCard",
+            hasThumbnail: true,
+            previewCount: 1,
+            encryptedRoom: false,
+        });
+        expect(PosthogAnalytics.instance.trackEvent).toHaveBeenCalledTimes(1);
+    });
+});