parallel/test/Worker/TestTask.php

<?php

namespace Amp\Tests\Concurrent\Worker;

use Amp\Concurrent\Worker\{Environment, Task};

class TestTask implements Task
{
    private $returnValue;

    public function __construct($returnValue)
    {
        $this->returnValue = $returnValue;
    }

    public function run(Environment $environment)
    {
        return $this->returnValue;
    }
}