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diff --git a/vendor/behat/behat/src/Behat/Behat/Context/Reader/ContextReaderCachedPerContext.php b/vendor/behat/behat/src/Behat/Behat/Context/Reader/ContextReaderCachedPerContext.php
new file mode 100644
index 000000000..8a51662e2
--- /dev/null
+++ b/vendor/behat/behat/src/Behat/Behat/Context/Reader/ContextReaderCachedPerContext.php
@@ -0,0 +1,54 @@
+<?php
+
+/*
+ * This file is part of the Behat.
+ * (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\Behat\Context\Reader;
+
+use Behat\Behat\Context\Environment\ContextEnvironment;
+
+/**
+ * Proxies call to another reader and caches context callees for a length of an entire exercise.
+ *
+ * @author Konstantin Kudryashov <ever.zet@gmail.com>
+ */
+final class ContextReaderCachedPerContext implements ContextReader
+{
+    /**
+     * @var ContextReader
+     */
+    private $childReader;
+    /**
+     * @var array[]
+     */
+    private $cachedCallees = array();
+
+    /**
+     * Initializes reader.
+     *
+     * @param ContextReader $childReader
+     */
+    public function __construct(ContextReader $childReader)
+    {
+        $this->childReader = $childReader;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function readContextCallees(ContextEnvironment $environment, $contextClass)
+    {
+        if (isset($this->cachedCallees[$contextClass])) {
+            return $this->cachedCallees[$contextClass];
+        }
+
+        return $this->cachedCallees[$contextClass] = $this->childReader->readContextCallees(
+            $environment, $contextClass
+        );
+    }
+}