diff --git a/tests/src/Unit/Plugin/Processor/TestItemsTrait.php b/tests/src/Unit/Plugin/Processor/TestItemsTrait.php
index 50326cc..46a9df3 100644
--- a/tests/src/Unit/Plugin/Processor/TestItemsTrait.php
+++ b/tests/src/Unit/Plugin/Processor/TestItemsTrait.php
@@ -92,17 +92,15 @@ public function createItems(IndexInterface $index, $count, array $fields, Comple
         $item->setOriginalObject($object);
       }
       foreach ($fields as $combined_property_path => $field_info) {
-        list($field_datasource_id, $property_path) = Utility::splitCombinedId($combined_property_path);
+        list($field_info['datasource_id'], $field_info['property_path']) = Utility::splitCombinedId($combined_property_path);
         // Only add fields of the right datasource.
-        if (isset($field_datasource_id) && $field_datasource_id != $datasource_id) {
+        if (isset($field_info['datasource_id']) && $field_info['datasource_id'] != $datasource_id) {
           continue;
         }
         $field_id = \Drupal::getContainer()
           ->get('search_api.fields_helper')
-          ->getNewFieldId($index, $property_path);
-        $field = new Field($index, $field_id);
-        $field->setDatasourceId($field_datasource_id)
-          ->setPropertyPath($property_path);
+          ->getNewFieldId($index, $field_info['property_path']);
+        $field = Utility::createField($index, $field_id, $field_info);
         $item->setField($field_id, $field);
       }
       $item->setFieldsExtracted(TRUE);