class MigrationTest

class MigrationTest extends KernelTestBase {
  
  /**
   * Enable field because we are using one of its source plugins.
   *
   * @var array
   */
  protected static $modules = [
    'migrate',
    'field',
  ];
  
  /**
   * Tests Migration::set().
   *
   * @covers ::set
   */
  public function testSetInvalidation() {
    $migration = \Drupal::service('plugin.manager.migration')->createStubMigration([
      'source' => [
        'plugin' => 'empty',
      ],
      'destination' => [
        'plugin' => 'entity:entity_view_mode',
      ],
    ]);
    $this->assertEquals('empty', $migration->getSourcePlugin()
      ->getPluginId());
    $this->assertEquals('entity:entity_view_mode', $migration->getDestinationPlugin()
      ->getPluginId());
    // Test the source plugin is invalidated.
    $migration->set('source', [
      'plugin' => 'embedded_data',
      'data_rows' => [],
      'ids' => [],
    ]);
    $this->assertEquals('embedded_data', $migration->getSourcePlugin()
      ->getPluginId());
    // Test the destination plugin is invalidated.
    $migration->set('destination', [
      'plugin' => 'null',
    ]);
    $this->assertEquals('null', $migration->getDestinationPlugin()
      ->getPluginId());
  }

}