Add e2e test

ui-tests/tests/jupyterlab_new_launcher.spec.ts

@@ -1,23 +1,6 @@
 import { expect, test } from '@jupyterlab/galata';
 
-/**
- * Don't load JupyterLab webpage before running the tests.
- * This is required to ensure we capture all log messages.
- */
-test.use({ autoGoto: false });
-
-test('should emit an activation console message', async ({ page }) => {
-  const logs: string[] = [];
-
-  page.on('console', message => {
-    logs.push(message.text());
-  });
-
-  await page.goto();
-
-  expect(
-    logs.filter(
-      s => s === 'JupyterLab extension jupyterlab-new-launcher is activated!'
-    )
-  ).toHaveLength(1);
+test('should render new launcher', async ({ page }) => {
+  const launcher = page.locator('jp-LauncherBody');
+  expect(await launcher.screenshot()).toMatchSnapshot('launcher.png');
 });