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

vendor/sebastian/comparator/src/MockObjectComparator.php

@@ -0,0 +1,45 @@
+<?php
+/*
+ * This file is part of the Comparator package.
+ *
+ * (c) Sebastian Bergmann <sebastian@phpunit.de>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace SebastianBergmann\Comparator;
+
+/**
+ * Compares PHPUnit_Framework_MockObject_MockObject instances for equality.
+ */
+class MockObjectComparator extends ObjectComparator
+{
+    /**
+     * Returns whether the comparator can compare two values.
+     *
+     * @param  mixed $expected The first value to compare
+     * @param  mixed $actual   The second value to compare
+     * @return bool
+     */
+    public function accepts($expected, $actual)
+    {
+        return $expected instanceof \PHPUnit_Framework_MockObject_MockObject && $actual instanceof \PHPUnit_Framework_MockObject_MockObject;
+    }
+
+    /**
+     * Converts an object to an array containing all of its private, protected
+     * and public properties.
+     *
+     * @param  object $object
+     * @return array
+     */
+    protected function toArray($object)
+    {
+        $array = parent::toArray($object);
+
+        unset($array['__phpunit_invocationMocker']);
+
+        return $array;
+    }
+}