đã tạo được test case của createUser

vendor/php-webdriver/webdriver/lib/Exception/Internal/DriverServerDiedException.php

@@ -0,0 +1,16 @@
+<?php declare(strict_types=1);
+
+namespace Facebook\WebDriver\Exception\Internal;
+
+use Facebook\WebDriver\Exception\PhpWebDriverExceptionInterface;
+
+/**
+ * The driver server process is unexpectedly no longer available.
+ */
+class DriverServerDiedException extends \RuntimeException implements PhpWebDriverExceptionInterface
+{
+    public function __construct(?\Exception $previous = null)
+    {
+        parent::__construct('The driver server has died.', 0, $previous);
+    }
+}