Extract components and add more tests

src/Task/Interval.php

@@ -0,0 +1,43 @@
+<?php
+
+namespace Toalett\Multiprocessing\Task;
+
+use Toalett\Multiprocessing\Exception\InvalidArgumentException;
+
+class Interval
+{
+	private float $seconds;
+
+	private function __construct(float $seconds)
+	{
+		if ($seconds <= 0) {
+			throw new InvalidArgumentException('positive float', $seconds);
+		}
+		$this->seconds = $seconds;
+	}
+
+	public static function seconds(float $seconds): self
+	{
+		return new self($seconds);
+	}
+
+	public static function minutes(float $minutes): self
+	{
+		return new self(60.0 * $minutes);
+	}
+
+	public static function hours(float $hours): self
+	{
+		return new self(3600.0 * $hours);
+	}
+
+	public function asFloat(): float
+	{
+		return $this->seconds;
+	}
+
+	public function asInt(): int
+	{
+		return (int)$this->seconds;
+	}
+}