Implement Unit Tests, add Readme, add examples, stronger implementation

src/Tests/WorkersTest.php

@@ -0,0 +1,41 @@
+<?php
+
+namespace Toalett\Multiprocessing\Tests;
+
+use ReflectionObject;
+use Toalett\Multiprocessing\Workers;
+use PHPUnit\Framework\TestCase;
+
+class WorkersTest extends TestCase
+{
+	public function testItEmitsAnEventWhenAWorkerIsStarted(): void
+	{
+		$workers = new Workers();
+
+		$workerStartedEventHasTakenPlace = false;
+		$workers->on('worker_started', function() use (&$workerStartedEventHasTakenPlace) {
+			$workerStartedEventHasTakenPlace = true;
+		});
+
+		self::assertFalse($workerStartedEventHasTakenPlace);
+		$workers->createWorkerFor(fn() => exit(0), []);
+		self::assertTrue($workerStartedEventHasTakenPlace);
+	}
+
+	public function testItEmitsAnEventWhenAWorkerIsRemoved(): void
+	{
+		$workers = new Workers();
+		$reflector = new ReflectionObject($workers);
+		$method = $reflector->getMethod('remove');
+		$method->setAccessible(true);
+
+		$workerStoppedEventHasTakenPlace = false;
+		$workers->on('worker_stopped', function() use (&$workerStoppedEventHasTakenPlace) {
+			$workerStoppedEventHasTakenPlace = true;
+		});
+
+		self::assertFalse($workerStoppedEventHasTakenPlace);
+		$method->invoke($workers, 0);
+		self::assertTrue($workerStoppedEventHasTakenPlace);
+	}
+}