Installer/behat/testScreenshot/tests/acceptance/1ScreenLogCest.php

<?php
use Codeception\Util\Locator;
class ScreenLogCest
{
	public function frontpageWorks(AcceptanceTester $I)
	{
#log in

	$head = shell_exec('git rev-parse HEAD');
	$head = substr($head,0,-1);

$directorio = '01_login/';
		$I->amOnPage('/');
		$I->see('Nombre de usuario');
		$I->fillField('_username', 'admin');
		$I->fillField('_password', 'admin');

		shell_exec('mkdir -p ./tests/_output/debug/' . $head . "/" . $directorio);
		$I->makeScreenshot($head . "/" . $directorio . '1log');

		$I->click('_submit');
		$I->wait('3');


	}

}