field source plugin testing.php

  public function testFieldProviderCore() {
    /** @var \Drupal\migrate_drupal\Plugin\MigrateFieldPluginManagerInterface $plugin_manager */
    $plugin_manager = $this->container->get('plugin.manager.migrate.field');
    $this->setExpectedException(InvalidPluginDefinitionException::class, 'The missing_core plugin should define the core property.');
    $this->setExpectedException(InvalidPluginDefinitionException::class, 'The missing_source plugin should define the source_module property.');
    $this->setExpectedException(InvalidPluginDefinitionException::class, 'The missing_destination plugin should define the destination_module property.');
    $plugin_manager->getDefinition('missing_core');
    $plugin_manager->getDefinition('missing_source');
    $plugin_manager->getDefinition('missing_destination');
  }