diff --git a/core/modules/system/src/Tests/Update/DbDumpTest.php b/core/modules/system/src/Tests/Update/DbDumpTest.php
index ca1b043..9d96fac 100644
--- a/core/modules/system/src/Tests/Update/DbDumpTest.php
+++ b/core/modules/system/src/Tests/Update/DbDumpTest.php
@@ -177,6 +177,12 @@ public function testDbDumpCommand() {
     // The test data are in the dump (serialized).
     $pattern = preg_quote(serialize($this->data));
     $this->assertTrue(preg_match('/' . $pattern . '/', $command_tester->getDisplay()), 'Generated data is found in the exported script.');
+
+    // Check that the user account name and email address was properly escaped.
+    $pattern = preg_quote('"q\'uote\$dollar@example.com"');
+    $this->assertTrue(preg_match('/' . $pattern . '/', $command_tester->getDisplay()), 'The user account email address was properly escaped in the exported script.');
+    $pattern = preg_quote('\'$dollar\'');
+    $this->assertTrue(preg_match('/' . $pattern . '/', $command_tester->getDisplay()), 'The user account name was properly escaped in the exported script.');
   }
 
   /**