diff -u b/core/modules/system/tests/src/Unit/Breadcrumbs/PathBasedBreadcrumbBuilderTest.php b/core/modules/system/tests/src/Unit/Breadcrumbs/PathBasedBreadcrumbBuilderTest.php
--- b/core/modules/system/tests/src/Unit/Breadcrumbs/PathBasedBreadcrumbBuilderTest.php
+++ b/core/modules/system/tests/src/Unit/Breadcrumbs/PathBasedBreadcrumbBuilderTest.php
@@ -8,11 +8,12 @@
 namespace Drupal\Tests\system\Unit\Breadcrumbs;
 
 use Drupal\Core\Link;
-use Drupal\Core\Access\AccessResult;
+use Drupal\Core\Access\AccessResultAllowed;
 use Drupal\Core\Session\AccountInterface;
 use Drupal\Core\StringTranslation\TranslationInterface;
 use Drupal\Core\Url;
 use Drupal\Core\Utility\LinkGeneratorInterface;
+use Drupal\Core\Routing\RouteMatchInterface;
 use Drupal\system\PathBasedBreadcrumbBuilder;
 use Drupal\Tests\UnitTestCase;
 use Symfony\Cmf\Component\Routing\RouteObjectInterface;
@@ -337,12 +338,9 @@
    * Setup the access manager to always allow access to routes.
    */
   public function setupAccessManagerToAllow() {
-    $this->accessManager->expects($thus->any())
-      ->method('isAllowed')
-      ->willReturn(TRUE);
-    $this->accessManager->expects($thus->any())
+    $this->accessManager->expects($this->any())
       ->method('check')
-      ->willReturn($this->accessManager);
+      ->willReturn(new AccessResultAllowed());
   }
 
   protected function setupStubPathProcessor() {