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diff --git a/vendor/behat/behat/src/Behat/Testwork/Call/Handler/RuntimeCallHandler.php b/vendor/behat/behat/src/Behat/Testwork/Call/Handler/RuntimeCallHandler.php
new file mode 100644
index 000000000..62b3d1d6d
--- /dev/null
+++ b/vendor/behat/behat/src/Behat/Testwork/Call/Handler/RuntimeCallHandler.php
@@ -0,0 +1,163 @@
+<?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\Call\Handler;
+
+use Behat\Testwork\Argument\Validator;
+use Behat\Testwork\Call\Call;
+use Behat\Testwork\Call\CallResult;
+use Behat\Testwork\Call\Exception\CallErrorException;
+use Exception;
+
+/**
+ * Handles calls in the current runtime.
+ *
+ * @author Konstantin Kudryashov <ever.zet@gmail.com>
+ */
+final class RuntimeCallHandler implements CallHandler
+{
+    /**
+     * @var integer
+     */
+    private $errorReportingLevel;
+    /**
+     * @var bool
+     */
+    private $obStarted = false;
+    /**
+     * @var Validator
+     */
+    private $validator;
+
+    /**
+     * Initializes executor.
+     *
+     * @param integer $errorReportingLevel
+     */
+    public function __construct($errorReportingLevel = E_ALL)
+    {
+        $this->errorReportingLevel = $errorReportingLevel;
+        $this->validator = new Validator();
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function supportsCall(Call $call)
+    {
+        return true;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function handleCall(Call $call)
+    {
+        $this->startErrorAndOutputBuffering($call);
+        $result = $this->executeCall($call);
+        $this->stopErrorAndOutputBuffering();
+
+        return $result;
+    }
+
+    /**
+     * Used as a custom error handler when step is running.
+     *
+     * @see set_error_handler()
+     *
+     * @param integer $level
+     * @param string  $message
+     * @param string  $file
+     * @param integer $line
+     *
+     * @return Boolean
+     *
+     * @throws CallErrorException
+     */
+    public function handleError($level, $message, $file, $line)
+    {
+        if ($this->errorLevelIsNotReportable($level)) {
+            return false;
+        }
+
+        throw new CallErrorException($level, $message, $file, $line);
+    }
+
+    /**
+     * Executes single call.
+     *
+     * @param Call $call
+     *
+     * @return CallResult
+     */
+    private function executeCall(Call $call)
+    {
+        $reflection = $call->getCallee()->getReflection();
+        $callable = $call->getBoundCallable();
+        $arguments = $call->getArguments();
+        $return = $exception = null;
+
+        try {
+            $this->validator->validateArguments($reflection, $arguments);
+            $return = call_user_func_array($callable, $arguments);
+        } catch (Exception $caught) {
+            $exception = $caught;
+        }
+
+        $stdOut = $this->getBufferedStdOut();
+
+        return new CallResult($call, $return, $exception, $stdOut);
+    }
+
+    /**
+     * Returns buffered stdout.
+     *
+     * @return null|string
+     */
+    private function getBufferedStdOut()
+    {
+        return ob_get_length() ? ob_get_contents() : null;
+    }
+
+    /**
+     * Starts error handler and stdout buffering.
+     *
+     * @param Call $call
+     */
+    private function startErrorAndOutputBuffering(Call $call)
+    {
+        $errorReporting = $call->getErrorReportingLevel() ? : $this->errorReportingLevel;
+        set_error_handler(array($this, 'handleError'), $errorReporting);
+        $this->obStarted = ob_start();
+    }
+
+    /**
+     * Stops error handler and stdout buffering.
+     */
+    private function stopErrorAndOutputBuffering()
+    {
+        if ($this->obStarted) {
+            ob_end_clean();
+        }
+        restore_error_handler();
+    }
+
+    /**
+     * Checks if provided error level is not reportable.
+     *
+     * @param integer $level
+     *
+     * @return Boolean
+     */
+    private function errorLevelIsNotReportable($level)
+    {
+        return !(error_reporting() & $level);
+    }
+}