parallel/test/Worker/TestTask.php

<?php

namespace Amp\Parallel\Test\Worker;

use Amp\Delayed;
use Amp\Parallel\Worker\Environment;
use Amp\Parallel\Worker\Task;

class TestTask implements Task {
    private $returnValue;
    private $delay = 0;

    public function __construct($returnValue, int $delay = 0) {
        $this->returnValue = $returnValue;
        $this->delay = $delay;
    }

    public function run(Environment $environment) {
        if ($this->delay) {
            return new Delayed($this->delay, $this->returnValue);
        }

        return $this->returnValue;
    }
}