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Functional Test Symfony 4 with Kahlan 4

Posted in Symfony 4, testing by samsonasik on January 3, 2018

Yes, there is a bundle for it, but currently not fully work well with kahlan 4 yet. However, we can still use kahlan 4 for it. The simplest way is define Symfony 4 skeleton bootstrap in kahlan config, and use its property at specs, for example, we configure config at kahlan-config.php as follows:

<?php // kahlan-config.php 

use App\Kernel;
use Kahlan\Filter\Filters;
use Symfony\Component\HttpFoundation\Request;

Filters::apply($this, 'bootstrap', function($next) {

    require __DIR__ . '/vendor/autoload.php';

    $root = $this->suite()->root();
    $root->beforeAll(function () {
        $this->request = Request::createFromGlobals();
        $this->kernel  = new Kernel('test', false);

    return $next();


Above settings are minimal, if you need more setup, you can define there. If you didn’t require kahlan/kahlan:^4.0, you can require via composer:

$ composer require --dev kahlan/kahlan:^4.0

Give a try

Let’s try testing a famous /lucky/number from LuckyController. We have the following controller:

<?php // src/Controller/LuckyController.php

namespace App\Controller;

use Symfony\Bundle\FrameworkBundle\Controller\Controller;
use Symfony\Component\Routing\Annotation\Route;

class LuckyController extends Controller
     * @Route("/lucky/number", name="lucky_number")
    public function number()
        $number = mt_rand(0, 100);

        return $this->render('lucky/number.html.twig', [
            'number' => $number,

And our twig file is:

{# templates/lucky/number.html.twig #}

<h1>Your lucky number is {{ number }}</h1>

We can place test under spec directory at root directory, for its test, we can create a spec/Controller directory:

├── spec
│   └── Controller

Now, we can create the test as follows with make request to the ‘/lucky/number’ page and get its response. We can use toMatchEcho matcher provided with regex to get match random number of mt_rand(0, 100) that printed inside a response html content:

<?php // spec/Controller/LuckyControllerSpec.php

namespace App\Spec\Controller;

describe('LuckyController', function () {

    describe('/lucky/number', function () {

        it('shows lucky number', function () {

            $request = $this->request->create('/lucky/number', 'GET');
            $response = $this->kernel->handle($request);

            expect(function () use ($response) {
                "#Your lucky number is ([0-9]|[1-8][0-9]|9[0-9]|100)#"




Time to run it with command:

$ vendor/bin/kahlan 

We will get the success output:

That’s it 😉