Add test for inspector tooltip showing up

galata/test/jupyterlab/inspector-tooltip.ts

@@ -0,0 +1,22 @@
+// Copyright (c) Jupyter Development Team.
+// Distributed under the terms of the Modified BSD License.
+
+import { expect, test } from '@jupyterlab/galata';
+
+const fileName = 'notebook.ipynb';
+const TOOLTIP_SELECTOR = '.jp-Tooltip';
+
+test.describe('Inspector (contextual help) tooltip', () => {
+  test.beforeEach(async ({ page }) => {
+    await page.notebook.createNew(fileName);
+  });
+
+  test('Should show up on Shift + Tab', async ({ page }) => {
+    await page.notebook.setCell(0, 'code', 'int');
+    const tooltip = page.locator(TOOLTIP_SELECTOR);
+    await expect(tooltip).toHaveCount(0);
+    await page.keyboard.press('Shift+Tab');
+    await expect(tooltip).toHaveCount(1);
+    await expect(tooltip).toContainText('int');
+  });
+});