--- /dev/null
+<?php
+
+/**
+ * @file
+ * Provides necessary database additions for testing
+ * field_post_update_remove_handler_submit_setting()
+ */
+
+use Drupal\Core\Database\Database;
+
+$connection = Database::getConnection();
+
+$config = unserialize($connection->select('config', 'c')
+ ->fields('c', ['data'])
+ ->condition('collection', '')
+ ->condition('name', 'field.field.node.article.field_tags')
+ ->execute()
+ ->fetchField());
+
+$config['settings']['handler_submit'] = 'Change handler';
+
+$connection->update('config')
+ ->fields(['data' => serialize($config)])
+ ->condition('collection', '')
+ ->condition('name', 'field.field.node.article.field_tags')
+ ->execute();