Add upgrade rooms test

playwright/e2e/devtools/upgraderoom.spec.ts

@@ -0,0 +1,31 @@
+/*
+Copyright 2025 New Vector 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 { SettingLevel } from "../../../src/settings/SettingLevel";
+import { test, expect } from "../../element-web-test";
+
+test.describe("Room upgrade dialog", () => {
+    test.use({
+        displayName: "Alice"
+    });
+
+    test("should render the room upgrade dialog", { tag: "@screenshot" }, async ({ page, homeserver, user, app }) => {
+        // Enable developer mode
+        await app.settings.setValue("developerMode", null, SettingLevel.ACCOUNT, true);
+
+        await app.client.createRoom({ name: "Test Room" });
+        await app.viewRoomByName("Test Room");
+
+        const composer = app.getComposer().locator("[contenteditable]");
+        // Pick a room version that is likely to be supported by all our target homeservers.
+        await composer.fill("/upgraderoom 5");
+        await composer.press("Enter");
+        const dialog = page.locator(".mx_Dialog");
+        await dialog.getByLabel("Automatically invite members from this room to the new one").check();
+        await expect(dialog).toMatchScreenshot("upgrade-room.png");
+    });
+});