diff --git a/core/tests/Drupal/BuildTests/Update/UpdateSiteDrushTest.php b/core/tests/Drupal/BuildTests/Update/UpdateSiteDrushTest.php
index ccca6d2eb7..5570557a07 100644
--- a/core/tests/Drupal/BuildTests/Update/UpdateSiteDrushTest.php
+++ b/core/tests/Drupal/BuildTests/Update/UpdateSiteDrushTest.php
@@ -59,6 +59,7 @@ public function testSiteUpdateWithDrush($drush_requirement) {
     $this->assertCommandOutputContains('Updated metapackage file composer/Metapackage/CoreRecommended/composer.json.');
     $this->assertErrorOutputContains('Generating autoload files');
     $this->executeCommand('drush site-install --db-url=sqlite://db.sqlite -y');
+    $this->assertErrorOutputContains('FOO');
     $this->assertCommandOutputContains('Installation complete.');
 
     // Assert that it worked.