--- /dev/null
+<?php
+// @codingStandardsIgnoreFile
+
+use Drupal\Core\Database\Database;
+
+$connection = Database::getConnection();
+
+// Set the schema version.
+$connection->merge('key_value')
+ ->fields([
+ 'value' => 'i:8000;',
+ 'name' => 'entity_test_schema_converter',
+ 'collection' => 'system.schema',
+ ])
+ ->condition('collection', 'system.schema')
+ ->condition('name', 'entity_test_schema_converter')
+ ->execute();
+
+// Update core.extension.
+$extensions = $connection->select('config')
+ ->fields('config', ['data'])
+ ->condition('collection', '')
+ ->condition('name', 'core.extension')
+ ->execute()
+ ->fetchField();
+$extensions = unserialize($extensions);
+$extensions['module']['entity_test_schema_converter'] = 8000;
+$connection->update('config')
+ ->fields([
+ 'data' => serialize($extensions),
+ 'collection' => '',
+ 'name' => 'core.extension',
+ ])
+ ->condition('collection', '')
+ ->condition('name', 'core.extension')
+ ->execute();