assertRoles example

if ($modules) {
      // Install modules that have migrations that may provide permissions.       \Drupal::service('module_installer')->install($modules);
      $this->installEntitySchema('block_content');
      $this->installConfig(['block_content', 'comment']);
      $this->migrateContentTypes();
    }
    $this->executeMigrations($migrations);
    $id_map = $this->getMigration('d6_user_role')->getIdMap();

    // After all the migrations are run, there are changes to the permissions.     $this->assertRoles($role_data, $id_map);

    $roles = [
      'anonymous1',
      'authenticated1',
      'administrator1',
      'migrate_test_role_11',
      'migrate_test_role_21',
      'migrate_test_role_3_that_is_longer_than_thirty_two_characters1',
    ];
    $this->assertEmpty(Role::loadMultiple($roles));