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

vendor/symfony/console/Tests/Output/NullOutputTest.php

@@ -0,0 +1,39 @@
+<?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\Component\Console\Tests\Output;
+
+use Symfony\Component\Console\Output\NullOutput;
+use Symfony\Component\Console\Output\OutputInterface;
+
+class NullOutputTest extends \PHPUnit_Framework_TestCase
+{
+    public function testConstructor()
+    {
+        $output = new NullOutput();
+
+        ob_start();
+        $output->write('foo');
+        $buffer = ob_get_clean();
+
+        $this->assertSame('', $buffer, '->write() does nothing (at least nothing is printed)');
+        $this->assertFalse($output->isDecorated(), '->isDecorated() returns false');
+    }
+
+    public function testVerbosity()
+    {
+        $output = new NullOutput();
+        $this->assertSame(OutputInterface::VERBOSITY_QUIET, $output->getVerbosity(), '->getVerbosity() returns VERBOSITY_QUIET for NullOutput by default');
+
+        $output->setVerbosity(OutputInterface::VERBOSITY_VERBOSE);
+        $this->assertSame(OutputInterface::VERBOSITY_QUIET, $output->getVerbosity(), '->getVerbosity() always returns VERBOSITY_QUIET for NullOutput');
+    }
+}