ServerContext.php

<?php

namespace App\Context;

use Behat\Behat\Context\Context;
use Symfony\Component\Process\Process;

class ServerContext implements Context
{
    const TIMEOUT = 10;
    /**
     * @var Process
     */
    protected $process;

    /**
     * @BeforeScenario @run-server
     */
    public function startServerCommand()
    {
        $this->process = new Process('exec php -S localhost:8000 -t ./');
        $this->process->start();
    }

    /**
     * @AfterScenario @run-server
     */
    public function endServerCommand()
    {
        $this->process->stop(self::TIMEOUT, SIGTERM);
        $this->process = null;
    }
}