diff --git a/core/modules/block/src/Tests/Update/BlockContextMappingUpdateTest.php b/core/modules/block/src/Tests/Update/BlockContextMappingUpdateTest.php
index fcbe5ee..582a8e1 100644
--- a/core/modules/block/src/Tests/Update/BlockContextMappingUpdateTest.php
+++ b/core/modules/block/src/Tests/Update/BlockContextMappingUpdateTest.php
@@ -33,6 +33,7 @@ protected function setUp() {
       __DIR__ . '/../../../../system/tests/fixtures/update/drupal-8.bare.standard.php.gz',
       __DIR__ . '/../../../../system/tests/fixtures/update/drupal-8.block-context-manager-2354889.php',
       __DIR__ . '/../../../../system/tests/fixtures/update/drupal-8.language-enabled.php',
+      __DIR__ . '/../../../../system/tests/fixtures/update/drupal-8.block-test-enabled.php',
     ];
 
     parent::setUp();
diff --git a/core/modules/system/tests/fixtures/update/drupal-8.block-test-enabled.php b/core/modules/system/tests/fixtures/update/drupal-8.block-test-enabled.php
new file mode 100644
index 0000000..d26b379
--- /dev/null
+++ b/core/modules/system/tests/fixtures/update/drupal-8.block-test-enabled.php
@@ -0,0 +1,36 @@
+<?php
+
+/**
+ * @file
+ * Partial database to mimic the installation of the update_test_schema module.
+ */
+
+use Drupal\Core\Database\Database;
+
+$connection = Database::getConnection();
+
+// Set the schema version.
+$connection->insert('key_value')
+  ->fields([
+    'collection' => 'system.schema',
+    'name' => 'block_test',
+    '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']['block_test'] = 8000;
+$connection->update('config')
+  ->fields([
+    'data' => serialize($extensions),
+  ])
+  ->condition('collection', '')
+  ->condition('name', 'core.extension')
+  ->execute();
diff --git a/core/modules/system/tests/fixtures/update/drupal-8.language-enabled.php b/core/modules/system/tests/fixtures/update/drupal-8.language-enabled.php
index dcd5cba..2306ade 100644
Binary files a/core/modules/system/tests/fixtures/update/drupal-8.language-enabled.php and b/core/modules/system/tests/fixtures/update/drupal-8.language-enabled.php differ