diff --git a/core/modules/system/src/Tests/Update/UpdatePathTestBaseTest.php b/core/modules/system/src/Tests/Update/UpdatePathTestBaseTest.php
index fb01ecf..fa2b96b 100644
--- a/core/modules/system/src/Tests/Update/UpdatePathTestBaseTest.php
+++ b/core/modules/system/src/Tests/Update/UpdatePathTestBaseTest.php
@@ -25,7 +25,10 @@ class UpdatePathTestBaseTest extends UpdatePathTestBase {
    * {@inheritdoc}
    */
   protected function setUp() {
-    $this->databaseDumpFiles = [__DIR__ . '/../../../tests/fixtures/update/drupal-8.bare.standard.php.gz'];
+    $this->databaseDumpFiles = [
+      __DIR__ . '/../../../tests/fixtures/update/drupal-8.bare.standard.php.gz',
+      __DIR__ . '/../../../tests/fixtures/update/drupal-8.update-test-schema-enabled.php',
+    ];
     parent::setUp();
   }
 
diff --git a/core/modules/system/tests/fixtures/update/drupal-8.update-test-schema-enabled.php b/core/modules/system/tests/fixtures/update/drupal-8.update-test-schema-enabled.php
new file mode 100644
index 0000000..16042a4
--- /dev/null
+++ b/core/modules/system/tests/fixtures/update/drupal-8.update-test-schema-enabled.php
@@ -0,0 +1,52 @@
+<?php
+
+/**
+ * @file
+ * Partial database to mimic the installation of the update_test_schema module.
+ */
+
+use Drupal\Core\Database\Database;
+
+$connection = Database::getConnection();
+
+// Create the table.
+$connection->schema()->createTable('update_test_schema_table', array(
+  'fields' => array(
+    'a' => array(
+      'type' => 'int',
+      'not null' => TRUE,
+      'size' => 'normal',
+    ),
+    'b' => array(
+      'type' => 'blob',
+      'not null' => FALSE,
+      'size' => 'normal',
+    ),
+  ),
+));
+
+// Set the schema version.
+$connection->insert('key_value')
+  ->fields([
+    'collection' => 'system.schema',
+    'name' => 'update_test_schema',
+    'value' => 'i:8000;',
+  ])
+  ->execute();
+
+// Update core.extension.
+$extensions = $connection->select('config')
+  ->fields('config', ['data'])
+  ->condition('collection', '')
+  ->condition('name', 'core.extension')
+  ->execute()
+  ->fetchField();
+$extensions = unserialize($extensions);
+$extensions['module']['update_test_schema'] = 8000;
+$connection->update('config')
+  ->fields([
+    'data' => serialize($extensions),
+  ])
+  ->condition('collection', '')
+  ->condition('name', 'core.extension')
+  ->execute();