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diff --git a/vendor/behat/behat/src/Behat/Testwork/Environment/ServiceContainer/EnvironmentExtension.php b/vendor/behat/behat/src/Behat/Testwork/Environment/ServiceContainer/EnvironmentExtension.php
new file mode 100644
index 000000000..e06f058c7
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+++ b/vendor/behat/behat/src/Behat/Testwork/Environment/ServiceContainer/EnvironmentExtension.php
@@ -0,0 +1,147 @@
+<?php
+
+/*
+ * This file is part of the Behat Testwork.
+ * (c) Konstantin Kudryashov <ever.zet@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Behat\Testwork\Environment\ServiceContainer;
+
+use Behat\Testwork\ServiceContainer\Extension;
+use Behat\Testwork\ServiceContainer\ExtensionManager;
+use Behat\Testwork\ServiceContainer\ServiceProcessor;
+use Symfony\Component\Config\Definition\Builder\ArrayNodeDefinition;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
+use Symfony\Component\DependencyInjection\Definition;
+
+/**
+ * Testwork test environment extension.
+ *
+ * Extends testwork with environment services.
+ *
+ * @author Konstantin Kudryashov <ever.zet@gmail.com>
+ */
+final class EnvironmentExtension implements Extension
+{
+    /*
+     * Available services
+     */
+    const MANAGER_ID = 'environment.manager';
+
+    /*
+     * Available extension points
+     */
+    const HANDLER_TAG = 'environment.handler';
+    const READER_TAG = 'environment.reader';
+
+    /**
+     * @var ServiceProcessor
+     */
+    private $processor;
+
+    /**
+     * Initializes extension.
+     *
+     * @param null|ServiceProcessor $processor
+     */
+    public function __construct(ServiceProcessor $processor = null)
+    {
+        $this->processor = $processor ? : new ServiceProcessor();
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getConfigKey()
+    {
+        return 'environments';
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function initialize(ExtensionManager $extensionManager)
+    {
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function configure(ArrayNodeDefinition $builder)
+    {
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function load(ContainerBuilder $container, array $config)
+    {
+        $this->loadManager($container);
+        $this->loadStaticEnvironmentHandler($container);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function process(ContainerBuilder $container)
+    {
+        $this->processHandlers($container);
+        $this->processReaders($container);
+    }
+
+    /**
+     * Loads environment manager.
+     *
+     * @param ContainerBuilder $container
+     */
+    protected function loadManager(ContainerBuilder $container)
+    {
+        $definition = new Definition('Behat\Testwork\Environment\EnvironmentManager');
+        $container->setDefinition(self::MANAGER_ID, $definition);
+    }
+
+    /**
+     * Loads static environments handler.
+     *
+     * @param ContainerBuilder $container
+     */
+    protected function loadStaticEnvironmentHandler(ContainerBuilder $container)
+    {
+        $definition = new Definition('Behat\Testwork\Environment\Handler\StaticEnvironmentHandler');
+        $definition->addTag(self::HANDLER_TAG, array('priority' => 0));
+        $container->setDefinition(self::HANDLER_TAG . '.static', $definition);
+    }
+
+    /**
+     * Processes all environment handlers.
+     *
+     * @param ContainerBuilder $container
+     */
+    protected function processHandlers(ContainerBuilder $container)
+    {
+        $references = $this->processor->findAndSortTaggedServices($container, self::HANDLER_TAG);
+        $definition = $container->getDefinition(self::MANAGER_ID);
+
+        foreach ($references as $reference) {
+            $definition->addMethodCall('registerEnvironmentHandler', array($reference));
+        }
+    }
+
+    /**
+     * Processes all environment readers.
+     *
+     * @param ContainerBuilder $container
+     */
+    protected function processReaders(ContainerBuilder $container)
+    {
+        $references = $this->processor->findAndSortTaggedServices($container, self::READER_TAG);
+        $definition = $container->getDefinition(self::MANAGER_ID);
+
+        foreach ($references as $reference) {
+            $definition->addMethodCall('registerEnvironmentReader', array($reference));
+        }
+    }
+}