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

vendor/symfony/browser-kit/README.md

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+BrowserKit Component
+====================
+
+BrowserKit simulates the behavior of a web browser.
+
+The component only provide an abstract client and does not provide any
+"default" backend for the HTTP layer.
+
+Resources
+---------
+
+For a simple implementation of a browser based on an HTTP layer, have a look
+at [Goutte](https://github.com/FriendsOfPHP/Goutte).
+
+For an implementation based on HttpKernelInterface, have a look at the
+[Client](https://github.com/symfony/symfony/blob/master/src/Symfony/Component/HttpKernel/Client.php)
+provided by the HttpKernel component.
+
+You can run the unit tests with the following command:
+
+    $ cd path/to/Symfony/Component/BrowserKit/
+    $ composer install
+    $ phpunit