diff --git a/core/includes/common.inc b/core/includes/common.inc
index d5e9c90..e9883cd 100644
--- a/core/includes/common.inc
+++ b/core/includes/common.inc
@@ -1296,10 +1296,7 @@ function drupal_strip_dangerous_protocols($uri) {
   static $allowed_protocols;

   if (!isset($allowed_protocols)) {
-    // During test-setup system.filter.protocols may be empty. In order to
-    // avoid test breakage, a list of protocols necessary to run tests is
-    // supplied in that case.
-    $allowed_protocols = array_flip(config('system.filter')->get('protocols') ?: array('ftp', 'http', 'https', 'irc', 'mailto', 'news', 'nntp', 'rtsp', 'sftp', 'ssh', 'tel', 'telnet', 'webcal'));
+    $allowed_protocols = array_flip(config('system.filter')->get('protocols'));
   }

   // Iteratively remove any invalid protocol found.
diff --git a/core/modules/filter/filter.module b/core/modules/filter/filter.module
index c17971c..01948b0 100644
--- a/core/modules/filter/filter.module
+++ b/core/modules/filter/filter.module
@@ -1552,7 +1552,7 @@ function _filter_url($text, $filter) {
   // we cannot cleanly differ between protocols here without hard-coding MAILTO,
   // so '//' is optional for all protocols.
   // @see filter_xss_bad_protocol()
-  $protocols = config('system.filter')->get('protocols') ?: array('ftp', 'http', 'https', 'irc', 'mailto', 'news', 'nntp', 'rtsp', 'sftp', 'ssh', 'tel', 'telnet', 'webcal');
+  $protocols = config('system.filter')->get('protocols');
   $protocols = implode(':(?://)?|', $protocols) . ':(?://)?';

   // Prepare domain name pattern.
diff --git a/core/modules/filter/lib/Drupal/filter/Tests/FilterUnitTest.php b/core/modules/filter/lib/Drupal/filter/Tests/FilterUnitTest.php
index e6e0999..fb28576 100644
--- a/core/modules/filter/lib/Drupal/filter/Tests/FilterUnitTest.php
+++ b/core/modules/filter/lib/Drupal/filter/Tests/FilterUnitTest.php
@@ -7,13 +7,14 @@

 namespace Drupal\filter\Tests;

-use Drupal\simpletest\UnitTestBase;
+use Drupal\simpletest\WebTestBase;
 use stdClass;

 /**
- * Unit tests for core filters.
+ * Unit tests for core filters. This class extends WebTestBase because we need
+ * the system module installed to get the allowed protocols from config.
  */
-class FilterUnitTest extends UnitTestBase {
+class FilterUnitTest extends WebTestBase {
   public static function getInfo() {
     return array(
       'name' => 'Filter module filters',