ModuleImplementsAlterTest.php in Drupal 8

Namespace

Drupal\KernelTests\Core\Extension

File

core/tests/Drupal/KernelTests/Core/Extension/ModuleImplementsAlterTest.php

<?php

namespace Drupal\KernelTests\Core\Extension;

use Drupal\KernelTests\KernelTestBase;

/**
 * Tests hook_module_implements_alter().
 *
 * @group Module
 */
class ModuleImplementsAlterTest extends KernelTestBase {

  /**
   * {@inheritdoc}
   */
  public static $modules = [
    'system',
  ];

  /**
   * Tests hook_module_implements_alter() adding an implementation.
   *
   * @see \Drupal\Core\Extension\ModuleHandler::buildImplementationInfo()
   * @see module_test_module_implements_alter()
   */
  public function testModuleImplementsAlter() {

    // Get an instance of the module handler, to observe how it is going to be
    // replaced.
    $module_handler = \Drupal::moduleHandler();
    $this
      ->assertTrue($module_handler === \Drupal::moduleHandler(), 'Module handler instance is still the same.');

    // Install the module_test module.
    \Drupal::service('module_installer')
      ->install([
      'module_test',
    ]);

    // Assert that the \Drupal::moduleHandler() instance has been replaced.
    $this
      ->assertFalse($module_handler === \Drupal::moduleHandler(), 'The \\Drupal::moduleHandler() instance has been replaced during \\Drupal::moduleHandler()->install().');

    // Assert that module_test.module is now included.
    $this
      ->assertTrue(function_exists('module_test_modules_installed'), 'The file module_test.module was successfully included.');
    $this
      ->assertArrayHasKey('module_test', \Drupal::moduleHandler()
      ->getModuleList());
    $this
      ->assertContains('module_test', \Drupal::moduleHandler()
      ->getImplementations('modules_installed'), 'module_test implements hook_modules_installed().');
    $this
      ->assertContains('module_test', \Drupal::moduleHandler()
      ->getImplementations('module_implements_alter'), 'module_test implements hook_module_implements_alter().');

    // Assert that module_test.implementations.inc is not included yet.
    $this
      ->assertFalse(function_exists('module_test_altered_test_hook'), 'The file module_test.implementations.inc is not included yet.');

    // Trigger hook discovery for hook_altered_test_hook().
    // Assert that module_test_module_implements_alter(*, 'altered_test_hook')
    // has added an implementation.
    $this
      ->assertContains('module_test', \Drupal::moduleHandler()
      ->getImplementations('altered_test_hook'), 'module_test implements hook_altered_test_hook().');

    // Assert that module_test.implementations.inc was included as part of the process.
    $this
      ->assertTrue(function_exists('module_test_altered_test_hook'), 'The file module_test.implementations.inc was included.');
  }

  /**
   * Tests what happens if hook_module_implements_alter() adds a non-existing
   * function to the implementations.
   *
   * @see \Drupal\Core\Extension\ModuleHandler::buildImplementationInfo()
   * @see module_test_module_implements_alter()
   */
  public function testModuleImplementsAlterNonExistingImplementation() {

    // Install the module_test module.
    \Drupal::service('module_installer')
      ->install([
      'module_test',
    ]);

    // Trigger hook discovery.
    $this
      ->expectException(\RuntimeException::class);
    $this
      ->expectExceptionMessage('An invalid implementation module_test_unimplemented_test_hook was added by hook_module_implements_alter()');
    \Drupal::moduleHandler()
      ->getImplementations('unimplemented_test_hook');
  }

}

Classes

Name	Description
ModuleImplementsAlterTest	Tests hook_module_implements_alter().