Deal with AJAX block in web-crawler or create manually inputs - php

Question

Based on Alvin Bunk article link to article I want to create a web-cralwer that logins in a website then submits a form.
My problem is that on that website there is an Ajax block that generates after clicking and empty link few inputs that I need to fill so I need to click that empty link somehow or to insert the inputs manually .
I changed the code below in a lot of ways to try to make it work but on the visit function I got stuck
I get Uncaught Error: Call to a member function visit() on null
<?php
require 'vendor/autoload.php';
trait MinkSetup
{
private $minkBaseUrl;
private $minkSession;
/**
* #before
*/
public function setupMinkSession()
{
$this->minkBaseUrl = 'https://www.url.com';
$driver = new \Behat\Mink\Driver\Selenium2Driver('firefox');
$this->minkSession = new \Behat\Mink\Session($driver);
$this->minkSession->start();
}
public function getCurrentPage()
{
return $this->minkSession->getPage();
}
public function getCurrentPageContent()
{
return $this->getCurrentPage()->getContent();
}
public function visit($url)
{
echo $url;
$this->minkSession->visit($url);
}
public function login($user, $pass){
$this->minkSession->visit('complete url');
$page = $this->getCurrentPage();
echo $page;
$page->fillField('email', $user); // Enter username.
$page->fillField('password', $pass); // Enter password.
$page->pressButton('Login');
$content = $this->getCurrentPageContent();
$this->assertContains('logout', $content);
}
/**
* #afterClass
*/
public function logout(){
$page = $this->getCurrentPage();
$page->clickLink('logout');
}
}
use PHPUnit\Framework\TestCase;
class MinkPetitionTest extends TestCase
{
use MinkSetup;
public function testSubmitPage(){
$this->login('user', 'pw'); // Login first.
$this->visit('full url');
$page = $this->getCurrentPage(); // Get the page.
echo $page;
$page->fillField('form_ban_id', '1234');
$page->pressButton('form_find_student');
$content = $this->getCurrentPageContent(); // Get page content.
$this->assertContains('<u>No Petitions</u> exist for Some User Student ID: 1234', $content);
}
}
$client = new MinkPetitionTest(); //tried to get something to work
$client->testSubmitPage(); //same here

Answer 1

You need to change your test class like so if you are using the latest phpunit:
...
use PHPUnit\Framework\TestCase;
class MinkPetitionTest extends TestCase
{
...
Can you try that first and see the result?
EDIT #2
Also, your trait file is incorrect. it should be:
trait MinkSetup
{
private $minkBaseUrl;
...
public function visit($url)
{
$this->minkSession->visit($this->minkBaseUrl . $url);
}
...
Try that