MAGETWO-65236: Expiration date of PHPSESSID cookie is not updated

Author: rganin

lib/internal/Magento/Framework/Session/Test/Unit/SessionManagerTest.php

@@ -4,10 +4,6 @@
  * See COPYING.txt for license details.
  */
 // @codingStandardsIgnoreStart
-namespace {
-    $mockPHPFunctions = true;
-}
-
 namespace Magento\Framework\Session\Test\Unit {
     // @codingStandardsIgnoreEnd
 
@@ -53,6 +49,7 @@ class SessionManagerTest extends \PHPUnit_Framework_TestCase
         protected function setUp()
         {
             global $mockPHPFunctions;
+            $mockPHPFunctions = true;
             require_once __DIR__ . '/_files/mock_ini_set.php';
             require_once __DIR__ . '/_files/mock_session_regenerate_id.php';
 
@@ -84,5 +81,11 @@ public function testSessionManagerConstructor()
             $this->objectManager->getObject(\Magento\Framework\Session\SessionManager::class);
             $this->assertTrue(SessionManagerTest::$isIniSetInvoked);
         }
+
+        protected function tearDown()
+        {
+            global $mockPHPFunctions;
+            $mockPHPFunctions = false;
+        }
     }
 }