Extract components and add more tests

src/Task/Tasks.php

@@ -0,0 +1,37 @@
+<?php
+
+namespace Toalett\Multiprocessing\Task;
+
+use React\EventLoop\LoopInterface;
+
+class Tasks
+{
+	/** @var Task[] */
+	private array $tasks;
+	private ?LoopInterface $loop = null;
+
+	public function __construct(Task ...$tasks)
+	{
+		$this->tasks = $tasks;
+	}
+
+	public function enable(LoopInterface $loop): void
+	{
+		if (is_null($this->loop)) {
+			$this->loop = $loop;
+			foreach ($this->tasks as $task) {
+				$task->enable($this->loop);
+			}
+		}
+	}
+
+	public function cancel(): void
+	{
+		if (!is_null($this->loop)) {
+			foreach ($this->tasks as $task) {
+				$task->cancel($this->loop);
+			}
+			$this->loop = null;
+		}
+	}
+}