Improve remote Matrix token refresh

tests/matrix-token-extractor.test.ts

@@ -0,0 +1,33 @@
+import { describe, expect, it, vi } from 'vitest';
+import type { BrowserContext, Frame } from 'playwright';
+import { createMockLogger } from './mockLogger.js';
+import {
+  extractMatrixCredentials,
+  MatrixBrowserLoginRequiredError,
+} from '../src/services/chat/matrix/token-extractor.js';
+
+describe('extractMatrixCredentials', () => {
+  it('fails as soon as Reddit redirects the chat page to login', async () => {
+    const handlers = new Map<string, (value: never) => void>();
+    const frame = { url: () => 'https://www.reddit.com/login/?dest=https://www.reddit.com/chat/' } as Frame;
+    const page = {
+      on: vi.fn((event: string, handler: (value: never) => void) => {
+        handlers.set(event, handler);
+      }),
+      mainFrame: vi.fn(() => frame),
+      goto: vi.fn(async () => {
+        handlers.get('framenavigated')?.(frame as never);
+        return null;
+      }),
+      url: vi.fn(() => frame.url()),
+      screenshot: vi.fn(async () => undefined),
+      close: vi.fn(async () => undefined),
+    };
+    const context = { newPage: vi.fn(async () => page) } as unknown as BrowserContext;
+
+    await expect(
+      extractMatrixCredentials(context, createMockLogger(), { timeoutMs: 5_000 }),
+    ).rejects.toBeInstanceOf(MatrixBrowserLoginRequiredError);
+    expect(page.screenshot).not.toHaveBeenCalled();
+  });
+});