Sets up the testing view with random field data.
\Drupal\views\ViewExecutable $view: The view to add field data to.
protected function prepareView(ViewExecutable $view) {
$view
->initDisplay();
foreach ($this->fields as $key => $field) {
$view->display_handler->options['fields'][$field['field_name']]['id'] = $field['field_name'];
$view->display_handler->options['fields'][$field['field_name']]['table'] = 'field_data_' . $field['field_name'];
$view->display_handler->options['fields'][$field['field_name']]['field'] = $field['field_name'];
}
}