create a Test folder for each pattern

Creational/Pool/Tests/PoolTest.php

@@ -0,0 +1,29 @@
+<?php
+
+namespace DesignPatterns\Creational\Pool\Tests;
+
+use DesignPatterns\Creational\Pool\Pool;
+
+class TestWorker
+{
+
+    public $id = 1;
+}
+
+class PoolTest extends \PHPUnit_Framework_TestCase
+{
+
+    public function testPool()
+    {
+        $pool = new Pool('DesignPatterns\Creational\Pool\Tests\TestWorker');
+        $worker = $pool->get();
+
+        $this->assertEquals(1, $worker->id);
+
+        $worker->id = 5;
+        $pool->dispose($worker);
+
+        $this->assertEquals(5, $pool->get()->id);
+        $this->assertEquals(1, $pool->get()->id);
+    }
+}