Update to drupal 8.0.0-rc1. For more information, see https://www.drupal.org/node/2582663

vendor/behat/mink/src/Exception/ElementNotFoundException.php

@@ -0,0 +1,54 @@
+<?php
+
+/*
+ * This file is part of the Mink package.
+ * (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\Mink\Exception;
+
+use Behat\Mink\Driver\DriverInterface;
+use Behat\Mink\Session;
+
+/**
+ * Exception thrown when an expected element is not found.
+ *
+ * @author Konstantin Kudryashov <ever.zet@gmail.com>
+ */
+class ElementNotFoundException extends ExpectationException
+{
+    /**
+     * Initializes exception.
+     *
+     * @param DriverInterface|Session $driver   driver instance
+     * @param string                  $type     element type
+     * @param string                  $selector element selector type
+     * @param string                  $locator  element locator
+     */
+    public function __construct($driver, $type = null, $selector = null, $locator = null)
+    {
+        $message = '';
+
+        if (null !== $type) {
+            $message .= ucfirst($type);
+        } else {
+            $message .= 'Tag';
+        }
+
+        if (null !== $locator) {
+            if (null === $selector || in_array($selector, array('css', 'xpath'))) {
+                $selector = 'matching '.($selector ?: 'locator');
+            } else {
+                $selector = 'with '.$selector;
+            }
+            $message .= ' '.$selector.' "'.$locator.'"';
+        }
+
+        $message .= ' not found.';
+
+        parent::__construct($message, $driver);
+    }
+}