diff --git a/core/modules/system/src/Tests/Session/SessionHttpsTest.php b/core/modules/system/src/Tests/Session/SessionHttpsTest.php
index 0fc0305..846ee49 100644
--- a/core/modules/system/src/Tests/Session/SessionHttpsTest.php
+++ b/core/modules/system/src/Tests/Session/SessionHttpsTest.php
@@ -46,12 +46,12 @@ protected function setUp() {
 
     $request = Request::createFromGlobals();
     if ($request->isSecure()) {
-      $this->secureSessionName = session_name();
-      $this->insecureSessionName = substr(session_name(), 1);
+      $this->secureSessionName = $this->getSessionName();
+      $this->insecureSessionName = substr($this->getSessionName(), 1);
     }
     else {
-      $this->secureSessionName = 'S' . session_name();
-      $this->insecureSessionName = session_name();
+      $this->secureSessionName = 'S' . $this->getSessionName();
+      $this->insecureSessionName = $this->getSessionName();
     }
   }
 
@@ -318,7 +318,7 @@ protected function loginHttps(AccountInterface $account) {
   /**
    * Extract internal path from the location header on the response.
    */
-  protected function getPathFromLocationHeader($https = FALSE, $response_code = 302) {
+  protected function getPathFromLocationHeader($https = FALSE, $response_code = 303) {
     // Generate the base_url.
     $base_url = $this->container->get('url_generator')->generateFromPath('', array('absolute' => TRUE));
     if ($https) {