sleeper

Sleeper.php

<?php

interface Sleeper
{
    public function sleep(int $seconds): void;
}

final class SystemSleeper implements Sleeper
{
    public function sleep(int $seconds): void
    {
        sleep($seconds);
    }
}

final class NullSleeper implements Sleeper
{
    public function sleep(int $seconds): void
    {
    }
}

final class ServiceThatNeedsToSleep
{
    public function __construct(private Sleeper $sleeper)
    {
    }

    public function doSomething(): void
    {
        // ...

        $this->sleeper->sleep(3);

        // ...
    }
}