Symfony2 functional testing InvalidArgumentException: The current node list is empty

Question

I get \"InvalidArgumentException: The current node list is empty.\" running functional tests through PHPUnit. Here is test i wrote:

public function testAdd()         


        

Answer 1

I was also struggling with this, and It appeared that the selectButton method triggered this error.

After reading up on the DOM Crawler docs I found that the selectButton method takes the actual button text as a string argument. So if your button is 'submit my form please', that will be your text.

It does take different parameters too, as shown below (taken from the docs)

A selectButton() method is available on the Crawler which returns another 
Crawler that matches a button (input[type=submit], input[type=image], 
or a button) with the given text.

EDIT

After finally successfully completing the test I would also recommend you follow this example for testing forms:

use Goutte\Client;

$client = new Client();
$crawler = $client->request('GET', 'https://github.com/login');

$form = $crawler->selectButton('Log in')->form();
$form['login'] = 'symfonyfan';
$form['password'] = 'anypass';

$crawler = $client->submit($form);
$this->assertTrue($crawler->filter('html:contains("Welcome Back")')->count() > 0);

The main difference being, I have used the Goutte bundle, which I installed with composer from the packagist (in my case I added "fabpot/goutte": "1.0.*@dev")