Add a test for dynamic text spacing for launcher cards (jupyterlab#15146

)

* added test for dynamic text spacing for launcher cards

* Changed launcher test to galata test folder

* added snapshot capability

* changes to get min-height value in css

* uncomment change

* removed min-height

* added loop to element.evaluate

* changed toBE to toContain

* took out loop and added toHaveCSS

* used parseFloat

* changed to parseInt

* made changes to compare recieved to expected value

* made some changes

* Converting value to string

* added px to show on expected value

* minor changes

* Minor changes

* added plus sign

* Mad minor changes

* changed location of px

* changes made to add px

* took out comment

* Update Playwright Snapshots

* Update Playwright Snapshots

* changes made to select launcher content instead of label

* Update Playwright Snapshots

* Update Playwright Snapshots

* changes made from feedback

* Update Playwright Snapshots

* Update Playwright Snapshots

---------

Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

galata/test/jupyterlab/launcher.test.ts

@@ -0,0 +1,46 @@
+// Copyright (c) Jupyter Development Team.
+// Distributed under the terms of the Modified BSD License.
+
+import { expect, galata, test } from '@jupyterlab/galata';
+
+test.use({
+  autoGoto: false,
+  mockState: galata.DEFAULT_DOCUMENTATION_STATE,
+  viewport: { height: 720, width: 1280 }
+});
+
+test.describe('Dynamic Text Spacing', () => {
+  test('should Use Dynamic Text Spacing', async ({ page }) => {
+    await page.goto();
+    await page.waitForSelector('.jp-LauncherCard-label');
+
+    let element = page.locator('div.jp-LauncherCard-label');
+    for (let i = 0; i < (await element.count()); i++) {
+      let height = await element
+        .nth(i)
+        .evaluate(el =>
+          window.getComputedStyle(el).getPropertyValue('min-height')
+        );
+
+      let expectedValue =
+        2.462 *
+        parseFloat(
+          await element
+            .nth(i)
+            .evaluate(el =>
+              window
+                .getComputedStyle(el)
+                .getPropertyValue('font-size')
+                .toString()
+            )
+        );
+
+      expect(height).toEqual(expectedValue + 'px');
+    }
+
+    const imageName = 'launcher-card-label-height.png';
+    expect(
+      await page.locator('.jp-Launcher-content').screenshot()
+    ).toMatchSnapshot(imageName.toLowerCase());
+  });
+});