playwright-mcp/tests/extension.spec.ts
Max Schmitt 6c3f3b6576
feat: add MCP Chrome extension (#325)
Instructions:

1. `git clone https://github.com/mxschmitt/playwright-mcp && git
checkout extension-drafft`
2. `npm ci && npm run build`
3. `chrome://extensions` in your normal Chrome, "load unpacked" and
select the extension folder.
4. `node cli.js --port=4242 --extension` - The URL it prints at the end
you can put into the extension popup.
5. 
Put either this into Claude Desktop (it does not support SSE yet hence
wrapping it or just put the URL into Cursor/VSCode)

```json
{
  "mcpServers": {
    "playwright": {
      "command": "bash",
      "args": [
        "-c",
        "source $HOME/.nvm/nvm.sh && nvm use --silent 22 && npx supergateway --streamableHttp http://127.0.0.1:4242/mcp"
      ]
    }
  }
}
```

Things like `Take a snapshot of my browser.` should now work in your
Prompt Chat.

----

- SSE only for now, since we already have a http server with a port
there
- Upstream "page tests" can be executed over this CDP relay via
https://github.com/microsoft/playwright/pull/36286
- Limitations for now are everything what happens outside of the tab its
session is shared with -> `window.open` / `target=_blank`.

---------

Co-authored-by: Yury Semikhatsky <yurys@chromium.org>
2025-06-13 13:15:17 -07:00

44 lines
1.6 KiB
TypeScript

/**
* Copyright (c) Microsoft Corporation.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import url from 'url';
import path from 'path';
import { spawnSync } from 'child_process';
import { test, expect } from './fixtures.js';
import { createConnection } from '@playwright/mcp';
test.skip(({ mcpMode }) => mcpMode !== 'extension');
test('does not allow --cdp-endpoint', async ({ startClient }) => {
await expect(createConnection({
browser: { browserName: 'firefox' },
...({ extension: true })
})).rejects.toThrow(/Extension mode is only supported for Chromium browsers/);
});
// NOTE: Can be removed when we drop Node.js 18 support and changed to import.meta.filename.
const __filename = url.fileURLToPath(import.meta.url);
test('does not support --device', async () => {
const result = spawnSync('node', [
path.join(__filename, '../../cli.js'), '--device=Pixel 5', '--extension',
]);
expect(result.error).toBeUndefined();
expect(result.status).toBe(1);
expect(result.stderr.toString()).toContain('Device emulation is not supported with extension mode.');
});