diff --git a/core/tests/Drupal/FunctionalJavascriptTests/Core/Session/SessionTest.php b/core/tests/Drupal/FunctionalJavascriptTests/Core/Session/SessionTest.php
index fa2d541c8a8b18f1e0ce24865a3198c4632f48eb..e02e0dfb0f02afe47c26f8cf1c6386692fd941e3 100644
--- a/core/tests/Drupal/FunctionalJavascriptTests/Core/Session/SessionTest.php
+++ b/core/tests/Drupal/FunctionalJavascriptTests/Core/Session/SessionTest.php
@@ -48,10 +48,13 @@ public function testSessionExpiration() {
     // number of times.
     $this->drupalGet('<front>');
 
+    $session_assert = $this->assertSession();
+
     $page = $this->getSession()->getPage();
 
     for ($i = 0; $i < 25; $i++) {
       $page->clickLink('Link to front page');
+      $session_assert->statusCodeEquals(200);
     }
   }
 
diff --git a/core/tests/Drupal/FunctionalJavascriptTests/JSWebAssert.php b/core/tests/Drupal/FunctionalJavascriptTests/JSWebAssert.php
index 94b5d4cec987a8aa5017fc9addcbb20519f4ca63..81d379f915bf82e5182a7e7b73d9f5f2108f38ec 100644
--- a/core/tests/Drupal/FunctionalJavascriptTests/JSWebAssert.php
+++ b/core/tests/Drupal/FunctionalJavascriptTests/JSWebAssert.php
@@ -366,60 +366,4 @@ function t(r, lx, ly) {
     return $this->session->evaluateScript($full_javascript_visibility_test);
   }
 
-  /**
-   * The use of statusCodeEquals() is not available.
-   *
-   * @param int $code
-   *   The status code.
-   *
-   * @throws \Behat\Mink\Exception\UnsupportedDriverActionException
-   *   Throws an exception on use.
-   */
-  public function statusCodeEquals($code) {
-    throw new UnsupportedDriverActionException('The use of statusCodeEquals() is not available in a functional JavaScript test.');
-  }
-
-  /**
-   * The use of statusCodeNotEquals() is not available.
-   *
-   * @param int $code
-   *   The status code.
-   *
-   * @throws \Behat\Mink\Exception\UnsupportedDriverActionException
-   *   Throws an exception on use.
-   */
-  public function statusCodeNotEquals($code) {
-    throw new UnsupportedDriverActionException('The use of statusCodeNotEquals() is not available in a functional JavaScript test.');
-  }
-
-  /**
-   * The use of responseHeaderEquals() is not available.
-   *
-   * @param string $name
-   *   The name of the header.
-   * @param string $value
-   *   The value to check the header against.
-   *
-   * @throws \Behat\Mink\Exception\UnsupportedDriverActionException
-   *   Throws an exception on use.
-   */
-  public function responseHeaderEquals($name, $value) {
-    throw new UnsupportedDriverActionException('The use of responseHeaderEquals() is not available in a functional JavaScript test.');
-  }
-
-  /**
-   * The use of responseHeaderNotEquals() is not available.
-   *
-   * @param string $name
-   *   The name of the header.
-   * @param string $value
-   *   The value to check the header against.
-   *
-   * @throws \Behat\Mink\Exception\UnsupportedDriverActionException
-   *   Throws an exception on use.
-   */
-  public function responseHeaderNotEquals($name, $value) {
-    throw new UnsupportedDriverActionException('The use of responseHeaderNotEquals() is not available in a functional JavaScript test.');
-  }
-
 }
diff --git a/core/tests/Drupal/Tests/BrowserTestBase.php b/core/tests/Drupal/Tests/BrowserTestBase.php
index 533e974512dffff72a67d1bc7a34170cc35ce456..5751368f615c1d906c005da607939652b83b92ba 100644
--- a/core/tests/Drupal/Tests/BrowserTestBase.php
+++ b/core/tests/Drupal/Tests/BrowserTestBase.php
@@ -715,6 +715,7 @@ protected function drupalLogin(AccountInterface $account) {
     }
 
     $this->drupalGet('user/login');
+    $this->assertSession()->statusCodeEquals(200);
     $this->submitForm([
       'name' => $account->getUsername(),
       'pass' => $account->passRaw,
@@ -739,6 +740,7 @@ protected function drupalLogout() {
     // screen.
     $assert_session = $this->assertSession();
     $this->drupalGet('user/logout', ['query' => ['destination' => 'user']]);
+    $assert_session->statusCodeEquals(200);
     $assert_session->fieldExists('name');
     $assert_session->fieldExists('pass');