Robo: Starting WebDriver in Docker container, starting PHP server, running acceptance tests

RoboFile.php

<?php
    public function testWebdriver($args = '', $opt = ['test|t' => null])
    {
        $test = $opt['test'] ? ':'.$opt['test'] : '';
        $container = $this->taskDockerRun('davert/selenium-env')
            ->detached()
            ->publish(4444,4444)
            ->env('APP_PORT', 8000)
            ->run();

        $this->taskServer(8000)
            ->dir('tests/data/app')
            ->background()
            ->host('0.0.0.0')
            ->run();

        sleep(3); // wait for selenium to launch

        $this->taskCodecept('./codecept')
            ->test('tests/unit/Codeception/Module/WebDriverTest.php'.$test)
            ->args($args)
            ->run();

        $this->taskDockerStop($container)->run();
    }
}
?>