[nodejs/node] Playwright tests failing to launch due to internal assertion error in Node.js

### ROOT CAUSE The issue is caused by an internal assertion error in Node.js, specifically related to the `firstWindow` property being undefined during the cleanup process in the `test-environment-helpers.ts` file. This suggests that the environment setup or teardown logic is not properly handling the browser context, leading to an undefined state. ### CODE FIX To resolve this issue, you need to ensure that the browser context is properly initialized and cleaned up. Here is a potential fix for the `test-environment-helpers.ts` file:

typescript
import { chromium } from 'playwright';

let browser: any = null;

export async function setupTestEnv() {
  browser = await chromium.launch();
}

export async function tearDownTestEnv() {
  if (browser) {
    await browser.close();
  }
}


In your `playwright.config.ts`, ensure that the `setupTestEnv` and `tearDownTestEnv` functions are called appropriately:

typescript
import { defineConfig } from '@playwright/test';
import { setupTestEnv, tearDownTestEnv } from './tests/test-environment-helpers';

export default defineConfig({
  testDir: './tests',
  use: {
    browserName: 'chromium',
  },
  globalSetup: async () => {
    await setupTestEnv();
  },
  globalTeardown: async () => {
    await tearDownTestEnv();
  },
});


Additionally, ensure that your test files are correctly importing and using these setup and teardown functions. For example:

typescript
import { test, expect } from '@playwright/test';
import { setupTestEnv, tearDownTestEnv } from '../test-environment-helpers';

test.beforeAll(async () => {
  await setupTestEnv();
});

test.afterAll(async () => {
  await tearDownTestEnv();
});

test('Main window state', async ({ page }) => {
  // Your test code here
});


By ensuring that the browser context is properly initialized and cleaned up, you should be able to resolve the internal assertion error and allow your Playwright tests to run successfully.