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

vendor/symfony/psr-http-message-bridge/Tests/Fixtures/Stream.php

@@ -0,0 +1,95 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Bridge\PsrHttpMessage\Tests\Fixtures;
+
+use Psr\Http\Message\StreamInterface;
+
+/**
+ * @author Kévin Dunglas <dunglas@gmail.com>
+ */
+class Stream implements StreamInterface
+{
+    private $stringContent;
+
+    public function __construct($stringContent = '')
+    {
+        $this->stringContent = $stringContent;
+    }
+
+    public function __toString()
+    {
+        return $this->stringContent;
+    }
+
+    public function close()
+    {
+    }
+
+    public function detach()
+    {
+    }
+
+    public function getSize()
+    {
+    }
+
+    public function tell()
+    {
+        return 0;
+    }
+
+    public function eof()
+    {
+        return true;
+    }
+
+    public function isSeekable()
+    {
+        return false;
+    }
+
+    public function seek($offset, $whence = SEEK_SET)
+    {
+    }
+
+    public function rewind()
+    {
+    }
+
+    public function isWritable()
+    {
+        return false;
+    }
+
+    public function write($string)
+    {
+    }
+
+    public function isReadable()
+    {
+        return true;
+    }
+
+    public function read($length)
+    {
+        return $this->stringContent;
+    }
+
+    public function getContents()
+    {
+        return $this->stringContent;
+    }
+
+    public function getMetadata($key = null)
+    {
+    }
+}