/**
  * Overrides \Drupal\views\Tests\ViewTestBase::schemaDefinition().
  *
  * Adds a uid column to test the relationships.
  */
 protected function schemaDefinition()
 {
     $schema = parent::schemaDefinition();
     $schema['views_test_data']['fields']['uid'] = array('description' => "The {users_field_data}.uid of the author of the beatle entry.", 'type' => 'int', 'unsigned' => TRUE, 'not null' => TRUE, 'default' => 0);
     return $schema;
 }