src/Tests/BigPipeTest.php                        |  4 ----
 tests/modules/big_pipe_test/big_pipe_test.module | 13 +++++++++++++
 2 files changed, 13 insertions(+), 4 deletions(-)

diff --git a/src/Tests/BigPipeTest.php b/src/Tests/BigPipeTest.php
index 7cc82c1..b058be2 100644
--- a/src/Tests/BigPipeTest.php
+++ b/src/Tests/BigPipeTest.php
@@ -61,10 +61,6 @@ class BigPipeTest extends WebTestBase {
    * - \Drupal\big_pipe\Controller\BigPipeController
    */
   public function testNoJsDetection() {
-    $this->container->get('module_installer')->install(['session_exists_cache_context_test']);
-    $this->rebuildContainer();
-    $this->rebuildAll();
-
     // 1. No session (anonymous).
     $this->drupalGet(Url::fromRoute('<front>'));
     $this->assertSessionCookieExists(FALSE);
diff --git a/tests/modules/big_pipe_test/big_pipe_test.module b/tests/modules/big_pipe_test/big_pipe_test.module
index e69de29..c808ce9 100644
--- a/tests/modules/big_pipe_test/big_pipe_test.module
+++ b/tests/modules/big_pipe_test/big_pipe_test.module
@@ -0,0 +1,13 @@
+<?php
+
+/**
+ * Implements hook_page_top().
+ */
+function big_pipe_test_page_top(array &$page_top) {
+  // Ensure this hook is invoked on every page load.
+  $page_top['#cache']['max-age'] = 0;
+
+  if (\Drupal::request()->query->get('trigger_session')) {
+    $_SESSION['big_pipe_test'] = TRUE;
+  }
+}