core/modules/big_pipe/src/Tests/BigPipeTest.php     |  4 ++++
 .../big_pipe_test/src/BigPipeTestController.php     | 21 +++++++++++++++++++++
 2 files changed, 25 insertions(+)

diff --git a/core/modules/big_pipe/src/Tests/BigPipeTest.php b/core/modules/big_pipe/src/Tests/BigPipeTest.php
index 72685d0..43b364a 100644
--- a/core/modules/big_pipe/src/Tests/BigPipeTest.php
+++ b/core/modules/big_pipe/src/Tests/BigPipeTest.php
@@ -318,6 +318,8 @@ public function testBigPipeNoSession() {
       $this->assertIdentical('MISS', $this->drupalGetHeader('X-Drupal-Cache'), 'Page cache miss.');
       $this->assertBigPipeResponseHeadersPresent($expectations['cache control visibility'], $expectations['surrogate control directive']);
       $this->assertNoCacheTag('cache_tag_set_in_lazy_builder');
+      $this->assertRaw('<a href="' . base_path() . 'big_pipe_test" data-drupal-link-system-path="big_pipe_test" class="is-active">This should be marked active</a>');
+      $this->assertRaw('<a href="' . base_path() . '" data-drupal-link-system-path="&lt;front&gt;">This should be marked inactive</a>');
 
       $cases = $this->getTestCases(FALSE);
       $this->assertBigPipeNoJsPlaceholders([
@@ -347,6 +349,8 @@ public function testBigPipeNoSession() {
       $this->assertFalse($this->drupalGetHeader('Surrogate-Control'), 'No Surrogate-Control header.');
       $this->assertFalse($this->drupalGetHeader('X-Accel-Buffering'), 'No X-Accel-Buffering header.');
       $this->assertCacheTag('cache_tag_set_in_lazy_builder');
+      $this->assertRaw('<a href="' . base_path() . 'big_pipe_test" data-drupal-link-system-path="big_pipe_test" class="is-active">This should be marked active</a>');
+      $this->assertRaw('<a href="' . base_path() . '" data-drupal-link-system-path="&lt;front&gt;">This should be marked inactive</a>');
 
 
       // Clear the Page Cache. Note that we use a cache tag that exists on this
diff --git a/core/modules/big_pipe/tests/modules/big_pipe_test/src/BigPipeTestController.php b/core/modules/big_pipe/tests/modules/big_pipe_test/src/BigPipeTestController.php
index 51ccb1c..35906f2 100644
--- a/core/modules/big_pipe/tests/modules/big_pipe_test/src/BigPipeTestController.php
+++ b/core/modules/big_pipe/tests/modules/big_pipe_test/src/BigPipeTestController.php
@@ -5,6 +5,7 @@
 use Drupal\big_pipe\Render\BigPipeMarkup;
 use Drupal\big_pipe\Tests\BigPipePlaceholderTestCases;
 use Drupal\big_pipe_test\EventSubscriber\BigPipeTestSubscriber;
+use Drupal\Core\Url;
 
 class BigPipeTestController {
 
@@ -52,6 +53,26 @@ public function test() {
     // 7. Exception: placeholder that causes response filter to throw exception.
     $build['exception__embedded_response'] = $cases['exception__embedded_response']->renderArray;
 
+    // Edge case for no-session (and hence anonymous) responses: active links.
+    // @see \Drupal\Core\EventSubscriber\ActiveLinkResponseFilter
+    $build['active_link'] = [
+      '#type' => 'link',
+      '#title' => 'This should be marked active',
+      '#url' => Url::fromRoute('big_pipe_test'),
+      '#options' => [
+        'set_active_class' => TRUE,
+      ],
+    ];
+
+    $build['inactive_link'] = [
+      '#type' => 'link',
+      '#title' => 'This should be marked inactive',
+      '#url' => Url::fromRoute('<front>'),
+      '#options' => [
+        'set_active_class' => TRUE,
+      ],
+    ];
+
     return $build;
   }