diff --git a/core/modules/simpletest/src/BrowserTestBase.php b/core/modules/simpletest/src/BrowserTestBase.php
index ae20fa8..08f48f2 100644
--- a/core/modules/simpletest/src/BrowserTestBase.php
+++ b/core/modules/simpletest/src/BrowserTestBase.php
@@ -183,7 +183,7 @@
    */
   protected $customTranslations;
 
-  /*
+  /**
    * Mink class for the default driver to use.
    *
    * Shoud be a fully qualified class name that implements
@@ -195,7 +195,7 @@
    */
   protected $minkDefaultDriverClass = '\Behat\Mink\Driver\GoutteDriver';
 
-  /*
+  /**
    * Mink default driver params.
    *
    * If it's an array its contents are used as constructor params when default
@@ -272,7 +272,7 @@ protected function getDefaultDriverInstance() {
 
     if (is_array($this->minkDefaultDriverArgs)) {
        // Use ReflectionClass to instantiate class with received params.
-      $reflector = new ReflectionClass($this->minkDefaultDriverClass);
+      $reflector = new \ReflectionClass($this->minkDefaultDriverClass);
       $driver = $reflector->newInstanceArgs($this->minkDefaultDriverArgs);
     }
     else {
diff --git a/core/modules/simpletest/src/JavascriptTestBase.php b/core/modules/simpletest/src/JavascriptTestBase.php
new file mode 100644
index 0000000..a9c66a6
--- /dev/null
+++ b/core/modules/simpletest/src/JavascriptTestBase.php
@@ -0,0 +1,46 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\simpletest\JavascriptTestBase.
+ */
+
+namespace Drupal\simpletest;
+
+use Zumba\Mink\Driver\PhantomJSDriver;
+
+/**
+ * Runs a browser test using phantomJS.
+ *
+ * Use this test baseclass if you want to test expected behaviour of some
+ * JavaScript.
+ */
+abstract class JavascriptTestBase extends BrowserTestBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  protected $minkDefaultDriverClass = PhantomjsDriver::class;
+
+  /**
+   * {@inheritdoc}
+   */
+  protected $minkDefaultDriverArgs = [
+    'http://127.0.0.1:8510',
+    '/tmp/browsertestbase-templatecache',
+  ];
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUp() {
+    parent::setUp();
+
+    // Setup some template cache using by the phantomjs mink driver.
+    $path = '/tmp/browsertestbase-templatecache';
+    if (!file_exists($path)) {
+      mkdir($path);
+    }
+  }
+
+}
diff --git a/core/modules/toolbar/tests/src/Functional/ToolbarIntegrationTest.php b/core/modules/toolbar/tests/src/Functional/ToolbarIntegrationTest.php
index 57b3150..0e3a8ec 100644
--- a/core/modules/toolbar/tests/src/Functional/ToolbarIntegrationTest.php
+++ b/core/modules/toolbar/tests/src/Functional/ToolbarIntegrationTest.php
@@ -7,14 +7,14 @@
 
 namespace Drupal\Tests\toolbar\Functional;
 
-use Drupal\simpletest\BrowserTestBase;
+use Drupal\simpletest\JavascriptTestBase;
 
 /**
  * Basic toolbar testing.
  *
  * @group toolbar
  */
-class ToolbarIntegrationTest extends BrowserTestBase {
+class ToolbarIntegrationTest extends JavascriptTestBase {
 
   /**
    * {@inheritdoc}
diff --git a/core/phpunit.xml.dist b/core/phpunit.xml.dist
index b2d6fe7..cfcc530 100644
--- a/core/phpunit.xml.dist
+++ b/core/phpunit.xml.dist
@@ -11,7 +11,6 @@
     <env name="SIMPLETEST_DB" value=""/>
     <!-- Example SIMPLETEST_DB value: mysql://username:password@localhost/databasename#table_prefix -->
     <!-- where driver will connect to -->
-    <env name="DRIVER_URL" value="http://127.0.0.1:8510/"/>
   </php>
   <testsuites>
     <testsuite name="unit">