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diff --git a/web/core/modules/system/tests/src/Functional/System/ShutdownFunctionsTest.php b/web/core/modules/system/tests/src/Functional/System/ShutdownFunctionsTest.php
new file mode 100644
index 000000000..f5d55be78
--- /dev/null
+++ b/web/core/modules/system/tests/src/Functional/System/ShutdownFunctionsTest.php
@@ -0,0 +1,56 @@
+<?php
+
+namespace Drupal\Tests\system\Functional\System;
+
+use Drupal\Tests\BrowserTestBase;
+
+/**
+ * Functional tests shutdown functions.
+ *
+ * @group system
+ */
+class ShutdownFunctionsTest extends BrowserTestBase {
+
+  /**
+   * Modules to enable.
+   *
+   * @var array
+   */
+  public static $modules = ['system_test'];
+
+  protected function tearDown() {
+    // This test intentionally throws an exception in a PHP shutdown function.
+    // Prevent it from being interpreted as an actual test failure.
+    // Not using File API; a potential error must trigger a PHP warning.
+    unlink(\Drupal::root() . '/' . $this->siteDirectory . '/error.log');
+    parent::tearDown();
+  }
+
+  /**
+   * Test shutdown functions.
+   */
+  public function testShutdownFunctions() {
+    $arg1 = $this->randomMachineName();
+    $arg2 = $this->randomMachineName();
+    $this->drupalGet('system-test/shutdown-functions/' . $arg1 . '/' . $arg2);
+
+    // If using PHP-FPM then fastcgi_finish_request() will have been fired
+    // returning the response before shutdown functions have fired.
+    // @see \Drupal\system_test\Controller\SystemTestController::shutdownFunctions()
+    $server_using_fastcgi = strpos($this->getSession()->getPage()->getContent(), 'The function fastcgi_finish_request exists when serving the request.');
+    if ($server_using_fastcgi) {
+      // We need to wait to ensure that the shutdown functions have fired.
+      sleep(1);
+    }
+    $this->assertEqual(\Drupal::state()->get('_system_test_first_shutdown_function'), [$arg1, $arg2]);
+    $this->assertEqual(\Drupal::state()->get('_system_test_second_shutdown_function'), [$arg1, $arg2]);
+
+    if (!$server_using_fastcgi) {
+      // Make sure exceptions displayed through
+      // \Drupal\Core\Utility\Error::renderExceptionSafe() are correctly
+      // escaped.
+      $this->assertRaw('Drupal is &lt;blink&gt;awesome&lt;/blink&gt;.');
+    }
+  }
+
+}