it was created the Structural namespace and append its patterns

Structural/Registry/Registry.php

@@ -1,6 +1,6 @@
 <?php
 
-namespace DesignPatterns\Registry;
+namespace DesignPatterns\Structural\Registry;
 
 /**
  * class Registry

Structural/Registry/RegistryTest.php

@@ -0,0 +1,17 @@
+<?php
+
+namespace DesignPatterns\Structural\Registry;
+
+use DesignPatterns\Structural\Registry\Registry;
+
+class RegistryTest extends \PHPUnit_Framework_TestCase
+{
+
+    public function testSetAndGetLogger()
+    {
+        Registry::set(Registry::LOGGER, new \StdClass());
+
+        $logger = Registry::get(Registry::LOGGER);
+        $this->assertInstanceOf('StdClass', $logger);
+    }
+}

Structural/Registry/index.php

@@ -1,9 +0,0 @@
-<?php
-
-use DesignPatterns\Registry\Registry;
-
-// while bootstrapping the application
-Registry::set(Registry::LOGGER, new \StdClass());
-
-// throughout the application
-Registry::get(Registry::LOGGER)->log('foo');