AlterTest.php

1. 9.x drupal/core/modules/field_ui/lib/Drupal/field_ui/Tests/AlterTest.php
2. 9.x drupal/core/modules/system/lib/Drupal/system/Tests/Common/AlterTest.php
3. 9.x drupal/core/modules/system/lib/Drupal/system/Tests/Form/AlterTest.php
4. 9.x drupal/core/modules/system/lib/Drupal/system/Tests/Database/AlterTest.php

<?php

/**
 * @file
 * Definition of Drupal\system\Tests\Form\AlterTest.
 */
namespace Drupal\system\Tests\Form;

use Drupal\simpletest\WebTestBase;

/**
 * Test form alter hooks.
 */
class AlterTest extends WebTestBase {

  /**
   * Modules to enable.
   *
   * @var array
   */
  public static $modules = array(
    'block',
    'form_test',
  );
  public static function getInfo() {
    return array(
      'name' => 'Form alter hooks',
      'description' => 'Tests hook_form_alter() and hook_form_FORM_ID_alter().',
      'group' => 'Form API',
    );
  }

  /**
   * Tests execution order of hook_form_alter() and hook_form_FORM_ID_alter().
   */
  function testExecutionOrder() {
    $this
      ->drupalGet('form-test/alter');

    // Ensure that the order is first by module, then for a given module, the
    // id-specific one after the generic one.
    $expected = array(
      'block_form_form_test_alter_form_alter() executed.',
      'form_test_form_alter() executed.',
      'form_test_form_form_test_alter_form_alter() executed.',
      'system_form_form_test_alter_form_alter() executed.',
    );
    $content = preg_replace('/\\s+/', ' ', filter_xss($this->content, array()));
    $this
      ->assert(strpos($content, implode(' ', $expected)) !== FALSE, 'Form alter hooks executed in the expected order.');
  }

}