Drupal 8.0.0 beta 12. More info: https://www.drupal.org/node/2514176

core/vendor/behat/mink-goutte-driver/tests/Custom/InstantiationTest.php

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+<?php
+
+namespace Behat\Mink\Tests\Driver\Custom;
+
+use Behat\Mink\Driver\GoutteDriver;
+
+class InstantiationTest extends \PHPUnit_Framework_TestCase
+{
+    public function testInstantiateWithClient()
+    {
+        $client = $this->getMockBuilder('Goutte\Client')->disableOriginalConstructor()->getMock();
+        $client->expects($this->once())
+            ->method('followRedirects')
+            ->with(true);
+
+        $driver = new GoutteDriver($client);
+
+        $this->assertSame($client, $driver->getClient());
+    }
+
+    public function testInstantiateWithoutClient()
+    {
+        $driver = new GoutteDriver();
+
+        $this->assertInstanceOf('Behat\Mink\Driver\Goutte\Client', $driver->getClient());
+    }
+}

core/vendor/behat/mink-goutte-driver/tests/GoutteConfig.php

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+<?php
+
+namespace Behat\Mink\Tests\Driver;
+
+use Behat\Mink\Driver\GoutteDriver;
+
+class GoutteConfig extends AbstractConfig
+{
+    public static function getInstance()
+    {
+        return new self();
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function createDriver()
+    {
+        return new GoutteDriver();
+    }
+
+    protected function supportsJs()
+    {
+        return false;
+    }
+}