class MigrateMissingDatabaseTest

class MigrateMissingDatabaseTest extends KernelTestBase {
  
  /**
   * {@inheritdoc}
   */
  protected static $modules = [
    'migrate',
    'migrate_drupal',
    'node',
  ];
  
  /**
   * The migration plugin manager.
   *
   * @var \Drupal\migrate\Plugin\MigrationPluginManager
   */
  protected $migrationPluginManager;
  
  /**
   * {@inheritdoc}
   */
  protected function setUp() : void {
    parent::setUp();
    $this->migrationPluginManager = \Drupal::service('plugin.manager.migration');
    // Set the 'migrate' database connection to use a missing host.
    $info = Database::getConnectionInfo('default')['default'];
    $info['host'] = 'does_not_exist';
    Database::addConnectionInfo('migrate', 'default', $info);
  }
  
  /**
   * Tests that a migration can be instantiated with the node module enabled.
   *
   * When the migrate_drupal and node modules are enabled, the migration
   * derivers call checkRequirements() whenever createInstance() is used. If the
   * database connection is not available, then Migration::setUpDatabase()
   * throws an exception. Check that the exception is caught and the migration
   * can still be used to access its IdMap.
   */
  public function testMissingDatabase() : void {
    $migration = $this->migrationPluginManager
      ->createInstance('d7_node_type');
    $this->assertInstanceOf(MigrationInterface::class, $migration);
    $this->assertInstanceOf(MigrateIdMapInterface::class, $migration->getIdMap());
  }

}