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diff --git a/vendor/behat/behat/src/Behat/Testwork/Cli/DebugCommand.php b/vendor/behat/behat/src/Behat/Testwork/Cli/DebugCommand.php
new file mode 100644
index 000000000..d888cb90b
--- /dev/null
+++ b/vendor/behat/behat/src/Behat/Testwork/Cli/DebugCommand.php
@@ -0,0 +1,80 @@
+<?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\Cli;
+
+use Behat\Testwork\ServiceContainer\Configuration\ConfigurationLoader;
+use Behat\Testwork\ServiceContainer\ExtensionManager;
+use Symfony\Component\Console\Command\Command as BaseCommand;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Output\OutputInterface;
+
+/**
+ * Provides debug information about the current environment.
+ *
+ * @author Konstantin Kudryashov <ever.zet@gmail.com>
+ */
+final class DebugCommand extends BaseCommand
+{
+    /**
+     * @var Application
+     */
+    private $application;
+    /**
+     * @var ConfigurationLoader
+     */
+    private $configurationLoader;
+    /**
+     * @var ExtensionManager
+     */
+    private $extensionManager;
+
+    /**
+     * Initialises command.
+     *
+     * @param Application         $application
+     * @param ConfigurationLoader $configurationLoader
+     * @param ExtensionManager    $extensionManager
+     */
+    public function __construct(
+        Application $application,
+        ConfigurationLoader $configurationLoader,
+        ExtensionManager $extensionManager
+    ) {
+        $this->application = $application;
+        $this->configurationLoader = $configurationLoader;
+        $this->extensionManager = $extensionManager;
+
+        parent::__construct('debug');
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function execute(InputInterface $input, OutputInterface $output)
+    {
+        $output->writeln(sprintf('%s version %s', $this->application->getName(), $this->application->getVersion()));
+
+        $output->writeln('');
+
+        $debug = $this->configurationLoader->debugInformation();
+        $output->writeln('--- configuration');
+        $output->writeln(sprintf('    environment variable (%s): %s', $debug['environment_variable_name'], $debug['environment_variable_content']));
+        $output->writeln(sprintf('    configuration file: %s', $debug['configuration_file_path']));
+
+        $output->writeln('');
+
+        $debug = $this->extensionManager->debugInformation();
+        $output->writeln('--- extensions');
+        $output->writeln(sprintf('    extensions loaded: %s', count($debug['extensions_list']) ? implode(', ', $debug['extensions_list']) : 'none'));
+
+        $output->writeln('');
+    }
+}