Re-added Config class

- Default `ConfigInterface` implementation. Extracts the relevant keys
  from the provided configuration array to create a configuration array
  to pass to the service manager's `withConfig()` method, returning the
  result.

Author: weierophinney

src/Config.php

@@ -0,0 +1,86 @@
+<?php
+/**
+ * Zend Framework (http://framework.zend.com/)
+ *
+ * @link      http://github.com/zendframework/zf2 for the canonical source repository
+ * @copyright Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
+ * @license   http://framework.zend.com/license/new-bsd New BSD License
+ */
+
+namespace Zend\ServiceManager;
+
+class Config implements ConfigInterface
+{
+    /**
+     * @var array
+     */
+    protected $config = [];
+
+    /**
+     * Constructor
+     *
+     * @param array $config
+     */
+    public function __construct($config = [])
+    {
+        $this->config = $config;
+    }
+
+    /**
+     * Configure service manager
+     *
+     * @param ServiceManager $serviceManager
+     * @return ServiceManager Returns a new instance with the merged configuration.
+     */
+    public function configureServiceManager(ServiceManager $serviceManager)
+    {
+        $config            = [];
+        $abstractFactories = isset($this->config['abstract_factories']) ? $this->config['abstract_factories'] : [];
+        $aliases           = isset($this->config['aliases']) ? $this->config['aliases'] : [];
+        $delegators        = isset($this->config['delegators']) ? $this->config['delegators'] : [];
+        $factories         = isset($this->config['factories']) ? $this->config['factories'] : [];
+        $initializers      = isset($this->config['initializers']) ? $this->config['initializers'] : [];
+        $invokables        = isset($this->config['invokables']) ? $this->config['invokables'] : [];
+        $lazyServices      = isset($this->config['lazy_services']) ? $this->config['lazy_services'] : [];
+        $services          = isset($this->config['services']) ? $this->config['services'] : [];
+        $shared            = isset($this->config['shared']) ? $this->config['shared'] : [];
+
+        if (! empty($abstractFactories)) {
+            $config['abstract_factories'] = $abstractFactories;
+        }
+
+        if (! empty($aliases)) {
+            $config['aliases'] = $aliases;
+        }
+
+        if (! empty($delegators)) {
+            $config['delegators'] = $delegators;
+        }
+
+        if (! empty($factories)) {
+            $config['factories'] = $factories;
+        }
+
+        if (! empty($initializers)) {
+            $config['initializers'] = $initializers;
+        }
+
+        if (! empty($invokables)) {
+            $config['invokables'] = $invokables;
+        }
+
+        if (! empty($lazyServices)) {
+            $config['lazy_services'] = $lazyServices;
+        }
+
+        if (! empty($services)) {
+            $config['services'] = $services;
+        }
+
+        if (! empty($shared)) {
+            $config['shared'] = $shared;
+        }
+
+        return $serviceManager->withConfig($config);
+    }
+}

test/ConfigTest.php

@@ -0,0 +1,73 @@
+<?php
+/**
+ * Zend Framework (http://framework.zend.com/)
+ *
+ * @link      http://github.com/zendframework/zf2 for the canonical source repository
+ * @copyright Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
+ * @license   http://framework.zend.com/license/new-bsd New BSD License
+ */
+
+namespace ZendTest\ServiceManager;
+
+use PHPUnit_Framework_TestCase as TestCase;
+use Zend\ServiceManager\Config;
+use Zend\ServiceManager\ServiceManager;
+
+class ConfigTest extends TestCase
+{
+    public function testPassesKnownServiceConfigKeysToServiceManagerWithConfigMethod()
+    {
+        $expected = [
+            'abstract_factories' => [
+                __CLASS__,
+                __NAMESPACE__,
+            ],
+            'aliases' => [
+                'foo' => __CLASS__,
+                'bar' => __NAMESPACE__,
+            ],
+            'delegators' => [
+                'foo' => [
+                    __CLASS__,
+                    __NAMESPACE__,
+                ]
+            ],
+            'factories' => [
+                'foo' => __CLASS__,
+                'bar' => __NAMESPACE__,
+            ],
+            'initializers' => [
+                __CLASS__,
+                __NAMESPACE__,
+            ],
+            'invokables' => [
+                'foo' => __CLASS__,
+                'bar' => __NAMESPACE__,
+            ],
+            'lazy_services' => [
+                'class_map' => [
+                    __CLASS__     => __CLASS__,
+                    __NAMESPACE__ => __NAMESPACE__,
+                ],
+            ],
+            'services' => [
+                'foo' => $this,
+            ],
+            'shared' => [
+                __CLASS__     => true,
+                __NAMESPACE__ => false,
+            ],
+        ];
+
+        $config = $expected + [
+            'foo' => 'bar',
+            'baz' => 'bat',
+        ];
+
+        $services = $this->prophesize(ServiceManager::class);
+        $services->withConfig($expected)->willReturn('CALLED');
+
+        $configuration = new Config($config);
+        $this->assertEquals('CALLED', $configuration->configureServiceManager($services->reveal()));
+    }
+}