Issue #3466743 by DYdave: Added initial automated tests for the 'AdminToolbarToolsSettingsForm'.

<?php

namespace Drupal\Tests\admin_toolbar_tools\Functional;

use Drupal\Tests\BrowserTestBase;

/**

 * Test the Admin Toolbar settings form.

 *

 * @group admin_toolbar

 */

class AdminToolbarToolsSettingsFormTest extends BrowserTestBase {

  /**

   * {@inheritdoc}

   */

  protected $defaultTheme = 'stark';

  /**

   * {@inheritdoc}

   */

  protected static $modules = [

    'admin_toolbar_tools',

  ];

  /**

   * A user with access to the Admin Toolbar settings form permission.

   *

   * @var \Drupal\user\UserInterface

   */

  protected $adminUser;

  /**

   * {@inheritdoc}

   */

  protected function setUp(): void {

    parent::setUp();

    $permissions = [

      'access toolbar',

      'access administration pages',

      'administer site configuration',

    ];

    $this->adminUser = $this->drupalCreateUser($permissions);

  }

  /**

   * Test backend Admin Toolbar Tools settings form fields and submission.

   */

  public function testAdminToolbarToolsSettingsForm(): void {

    /** @var \Drupal\Tests\WebAssert $assert */

    $assert = $this->assertSession();

    // Log in as an admin user to test admin pages.

    $this->drupalLogin($this->adminUser);

    // Test the 'Admin Toolbar settings' page form submission and fields.

    $this->drupalGet('admin/config/user-interface/admin-toolbar-tools');

    $this->submitForm([], 'Save configuration');

    $assert->pageTextContains('The configuration options have been saved.');

  }

}