add playwright test to crash the widget.

playwright/widget/error-screen-can-close.spec.ts

@@ -0,0 +1,50 @@
+/*
+Copyright 2025 New Vector Ltd.
+
+SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial
+Please see LICENSE in the repository root for full details.
+*/
+
+import { expect, test } from "@playwright/test";
+
+import { widgetTest } from "../fixtures/widget-user.ts";
+
+// Skip test, including Fixtures
+widgetTest.skip(
+  ({ browserName }) => browserName === "firefox",
+  "This test is not working on firefox, after hangup brooks is locked in a strange state with a blank widget",
+);
+
+widgetTest("Exit a widget in the error screen", async ({ asWidget }) => {
+  test.slow(); // Triples the timeout
+
+  const { brooks } = asWidget;
+
+  await expect(
+    brooks.page.getByRole("button", { name: "Video call" }),
+  ).toBeVisible();
+  await brooks.page.getByRole("button", { name: "Video call" }).click();
+
+  await expect(
+    brooks.page.getByRole("menuitem", { name: "Legacy Call" }),
+  ).toBeVisible();
+  await expect(
+    brooks.page.getByRole("menuitem", { name: "Element Call" }),
+  ).toBeVisible();
+
+  await brooks.page.getByRole("menuitem", { name: "Element Call" }).click();
+
+  const widgetContent = brooks.page
+    .locator('iframe[title="Element Call"]')
+    .contentFrame();
+  await widgetContent.getByTestId("lobby_joinCall").click();
+
+  await widgetContent.getByRole("button", { name: "Settings" }).click();
+  await widgetContent.getByRole("tab", { name: "Preferences" }).click();
+  await widgetContent.getByText("Developer mode", { exact: true }).click();
+  await widgetContent.getByRole("tab", { name: "Developer" }).click();
+  await widgetContent.getByRole("button", { name: "CrashMe" }).click();
+  await widgetContent.getByRole("button", { name: "Close" }).click();
+
+  await expect(brooks.page.locator(".mx_BasicMessageComposer")).toBeVisible();
+});