--- /dev/null
+<?php
+
+/**
+ * @file
+ * Contains database additions to drupal-8.bare.standard.php.gz for testing the
+ * upgrade path of https://www.drupal.org/node/2455125.
+ */
+
+use Drupal\Component\Uuid\Php;
+use Drupal\Core\Database\Database;
+use Drupal\Core\Serialization\Yaml;
+
+$connection = Database::getConnection();
+
+$view_file = __DIR__ . '/drupal-8.views-taxonomy-parent-2543726.yml';
+$view_config = Yaml::decode(file_get_contents($view_file));
+
+$connection->insert('config')
+ ->fields(['collection', 'name', 'data'])
+ ->values([
+ 'collection' => '',
+ 'name' => "views.view.test_taxonomy_parent",
+ 'data' => serialize($view_config),
+ ])
+ ->execute();
+
+$uuid = new Php();
+
+// The root tid.
+$tids = [0];
+
+for ($i = 0; $i < 4; $i++) {
+ $name = $this->randomString();
+
+ $tid = $connection->insert('taxonomy_term_data')
+ ->fields(['vid', 'uuid', 'langcode'])
+ ->values(['vid' => 'tags', 'uuid' => $uuid->generate(), 'langcode' => 'en'])
+ ->execute();
+
+ $connection->insert('taxonomy_term_field_data')
+ ->fields(['tid', 'vid', 'langcode', 'name', 'weight', 'changed', 'default_langcode'])
+ ->values(['tid' => $tid, 'vid' => 'tags', 'langcode' => 'en', 'name' => $name, 'weight' => 0, 'changed' => REQUEST_TIME, 'default_langcode' => 1])
+ ->execute();
+
+ $tids[] = $tid;
+}
+
+$hierarchy = [
+ // Term with tid 1 has terms with tids 2 and 3 as parents.
+ 1 => [2, 3],
+ 2 => [3, 0],
+ 3 => [0],
+];
+
+$query = $connection->insert('taxonomy_term_hierarchy')->fields(['tid', 'parent']);
+
+foreach ($hierarchy as $tid => $parents) {
+ foreach ($parents as $parent) {
+ $query->values(['tid' => $tids[$tid], 'parent' => $tids[$parent]]);
+ }
+}
+
+// Insert an extra record with no corresponding term.
+// See https://www.drupal.org/project/drupal/issues/2997982
+$query->values(['tid' => max($tids) + 1, 'parent' => 0]);
+
+$query->execute();