đã tạo được test case của createUser

vendor/php-webdriver/webdriver/lib/WebDriverNavigation.php

@@ -0,0 +1,45 @@
+<?php
+
+namespace Facebook\WebDriver;
+
+use Facebook\WebDriver\Remote\DriverCommand;
+use Facebook\WebDriver\Remote\ExecuteMethod;
+
+class WebDriverNavigation implements WebDriverNavigationInterface
+{
+    protected $executor;
+
+    public function __construct(ExecuteMethod $executor)
+    {
+        $this->executor = $executor;
+    }
+
+    public function back()
+    {
+        $this->executor->execute(DriverCommand::GO_BACK);
+
+        return $this;
+    }
+
+    public function forward()
+    {
+        $this->executor->execute(DriverCommand::GO_FORWARD);
+
+        return $this;
+    }
+
+    public function refresh()
+    {
+        $this->executor->execute(DriverCommand::REFRESH);
+
+        return $this;
+    }
+
+    public function to($url)
+    {
+        $params = ['url' => (string) $url];
+        $this->executor->execute(DriverCommand::GET, $params);
+
+        return $this;
+    }
+}