đã tạo được test case của createUser

vendor/php-webdriver/webdriver/lib/WebDriverNavigationInterface.php

@@ -0,0 +1,43 @@
+<?php
+
+namespace Facebook\WebDriver;
+
+/**
+ * An abstraction allowing the driver to access the browser's history and to
+ * navigate to a given URL.
+ */
+interface WebDriverNavigationInterface
+{
+    /**
+     * Move back a single entry in the browser's history, if possible.
+     * This is equivalent to pressing the back button in the browser or invoking window.history.back.
+     *
+     * @return self
+     */
+    public function back();
+
+    /**
+     * Move forward a single entry in the browser's history, if possible.
+     * This is equivalent to pressing the forward button in the browser or invoking window.history.back.
+     *
+     * @return self
+     */
+    public function forward();
+
+    /**
+     * Refresh the current page
+     * This is equivalent to pressing the refresh button in the browser.
+     *
+     * @return self
+     */
+    public function refresh();
+
+    /**
+     * Navigate to the given URL
+     *
+     * @param string $url
+     * @return self
+     * @see WebDriver::get()
+     */
+    public function to($url);
+}