Add Playwright E2E test to change time zone test

tests/e2e/specs/settings/settings.test.js

@@ -0,0 +1,34 @@
+const { test, expect } = require('@wordpress/e2e-test-utils-playwright');
+
+test.describe('General Settings', () => {
+    let defaultTimezone;
+
+    test.beforeEach(async ({ admin, page }) => {
+        await admin.visitAdminPage('options-general.php');
+
+        // Capture the default timezone
+        defaultTimezone = await page.locator('select#timezone_string').inputValue();
+    });
+
+    test.afterEach(async ({ page }) => {
+         // Revert to default timezone 
+         await page.locator('select#timezone_string').selectOption(defaultTimezone);
+         await page.click('#submit');
+    });
+    test('changes timezone', async ({ admin, page }) => {
+
+        // Change timezone
+        await page.locator('select#timezone_string').selectOption('Africa/Libreville');
+        await page.click('#submit');
+
+        // Verify success message
+        await expect(page.locator('#setting-error-settings_updated')).toHaveText(
+            'Settings saved.Dismiss this notice.'
+        );
+
+        // Verify selected timezone persists
+        const selectedTimezone = await page.locator('select#timezone_string').inputValue();
+        await expect(selectedTimezone).toBe('Africa/Libreville');       
+
+    });
+});