add: bstackdemo sample test

Author: Ankit098

tests/SingleTest.php

@@ -0,0 +1,20 @@
+<?php
+require_once('vendor/autoload.php');
+
+use Facebook\WebDriver\WebDriverBy;
+
+class Test extends BrowserStackTest {
+
+    public function testBrowserstackDemo() {
+        self::$driver->get("https://bstackdemo.com");
+        // store item to add to cart
+        $item_to_add = self::$driver->findElement(WebDriverBy::xpath("//*[@id='1']/p"))->getDomProperty('innerText');
+        // click on add to cart button
+        self::$driver->findElement(WebDriverBy::xpath("//*[@id='1']/div[4]"))->click();
+        // get the item from cart
+        $item_in_cart = self::$driver->findElement(WebDriverBy::xpath("//*[@id='__next']/div/div/div[2]/div[2]/div[2]/div/div[3]/p[1]"))->getDomProperty('innerText');
+        // assert item in cart is same as one that was added
+        $this->assertEquals($item_to_add, $item_in_cart);
+    }
+}
+?>