diff -u b/core/tests/Drupal/Tests/Core/Site/SettingsTest.php b/core/tests/Drupal/Tests/Core/Site/SettingsTest.php
--- b/core/tests/Drupal/Tests/Core/Site/SettingsTest.php
+++ b/core/tests/Drupal/Tests/Core/Site/SettingsTest.php
@@ -132,18 +132,20 @@
   }
 
   /**
+   * Tests Settings::testGetInstanceReflection().
+   *
    * @covers ::getInstance
-   * @expectedException \BadMethodCallException
    */
   public function testGetInstanceReflection() {
     $settings = new Settings(array());
 
-    $class = new \ReflectionClass('Drupal\Core\Site\Settings');
+    $class = new \ReflectionClass(Settings::class);
     $instace_property = $class->getProperty("instance");
     $instace_property->setAccessible(TRUE);
     $instace_property->setValue(NULL);
 
-    $singleton = $settings->getInstance();
+    $this->setExpectedException('BadMethodCallException');
+    $settings->getInstance();
   }
 
 }