create a Test folder for each pattern

Structural/DependencyInjection/Tests/DependencyInjectionTest.php

@@ -0,0 +1,25 @@
+<?php
+
+namespace DesignPatterns\Structural\DependencyInjection\Tests;
+
+use DesignPatterns\Structural\DependencyInjection\ArrayConfig;
+use DesignPatterns\Structural\DependencyInjection\Connection;
+
+class DependencyInjectionTest extends \PHPUnit_Framework_TestCase
+{
+    protected $config;
+    protected $source;
+
+    public function setUp()
+    {
+        $this->source = include 'config.php';
+        $this->config = new ArrayConfig($this->source);
+    }
+
+    public function testDependencyInjection()
+    {
+        $connection = new Connection($this->config);
+        $connection->connect();
+        $this->assertEquals($this->source['host'], $connection->getHost());
+    }
+}

Structural/DependencyInjection/Tests/config.php

@@ -0,0 +1,3 @@
+<?php
+
+return array('host' => 'github.com');