test(button): add tests for spinner inside buttons

Author: OS-martacarlos

core/src/components/button/test/spinner/button.e2e.ts

@@ -0,0 +1,14 @@
+import { expect } from '@playwright/test';
+import { configs, test } from '@utils/test/playwright';
+
+configs({ modes: ['ios', 'md', 'ionic-md', 'ionic-ios'] }).forEach(({ config, screenshot, title }) => {
+  test.describe(title('button: spinner'), () => {
+    test('should not have visual regressions', async ({ page }) => {
+      await page.goto(`/src/components/button/test/spinner`, config);
+
+      await page.setIonViewport();
+
+      await expect(page).toHaveScreenshot(screenshot(`button-spinner`));
+    });
+  });
+});