InfoAlterTest.php

<?php

namespace Drupal\Tests\system\Kernel\System;

use Drupal\KernelTests\KernelTestBase;

/**
 * Tests the effectiveness of hook_system_info_alter().
 *
 * @group system
 */
class InfoAlterTest extends KernelTestBase {
    protected static $modules = [
        'system',
    ];
    
    /**
     * Tests that theme .info.yml data is rebuild after enabling a module.
     *
     * Tests that info data is rebuilt after a module that implements
     * hook_system_info_alter() is enabled. Also tests if core *_list() functions
     * return freshly altered info.
     */
    public function testSystemInfoAlter() {
        \Drupal::state()->set('module_required_test.hook_system_info_alter', TRUE);
        $info = \Drupal::service('extension.list.module')->getList();
        $this->assertFalse(isset($info['node']->info['required']), 'Before the module_required_test is installed the node module is not required.');
        // Enable the test module.
        \Drupal::service('module_installer')->install([
            'module_required_test',
        ], FALSE);
        $this->assertTrue(\Drupal::moduleHandler()->moduleExists('module_required_test'), 'Test required module is enabled.');
        $info = \Drupal::service('extension.list.module')->getList();
        $this->assertTrue($info['node']->info['required'], 'After the module_required_test is installed the node module is required.');
    }

}