core/modules/system/src/Tests/System/ThemeTest.php                    | 2 +-
 core/modules/system/src/Tests/Update/UpdatePathTestJavaScriptTest.php | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/core/modules/system/src/Tests/System/ThemeTest.php b/core/modules/system/src/Tests/System/ThemeTest.php
index 5f81feb..1815679 100644
--- a/core/modules/system/src/Tests/System/ThemeTest.php
+++ b/core/modules/system/src/Tests/System/ThemeTest.php
@@ -75,7 +75,7 @@ function testThemeSettings() {
       // Relative path to a public file.
       $file_relative => array(
         'form' => $file_relative,
-        'src' => file_create_url($file->uri),
+        'src' => $GLOBALS['base_path'] . $file_relative,
       ),
       // Relative path to an arbitrary file.
       'core/misc/druplicon.png' => array(
diff --git a/core/modules/system/src/Tests/Update/UpdatePathTestJavaScriptTest.php b/core/modules/system/src/Tests/Update/UpdatePathTestJavaScriptTest.php
index df47e55..faf8119 100644
--- a/core/modules/system/src/Tests/Update/UpdatePathTestJavaScriptTest.php
+++ b/core/modules/system/src/Tests/Update/UpdatePathTestJavaScriptTest.php
@@ -44,7 +44,7 @@ protected function doSelectionTest() {
         continue;
       }
       $src = (string) $script['src'];
-      $file_content = file_get_contents(str_replace(base_path(), $GLOBALS['base_url'], $src));
+      $file_content = file_get_contents(preg_replace('#^' . base_path() . '(.*)#i', $GLOBALS['base_url'] . '/' . '${1}', $src));
 
       if (strpos($file_content, 'window.drupalSettings =') !== FALSE) {
         $found = TRUE;