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diff --git a/web/core/modules/system/src/Tests/Menu/AssertBreadcrumbTrait.php b/web/core/modules/system/src/Tests/Menu/AssertBreadcrumbTrait.php
new file mode 100644
index 000000000..a18f45cd3
--- /dev/null
+++ b/web/core/modules/system/src/Tests/Menu/AssertBreadcrumbTrait.php
@@ -0,0 +1,111 @@
+<?php
+
+namespace Drupal\system\Tests\Menu;
+
+use Drupal\Component\Utility\Html;
+use Drupal\Core\Url;
+
+/**
+ * Provides test assertions for verifying breadcrumbs.
+ */
+trait AssertBreadcrumbTrait {
+
+  use AssertMenuActiveTrailTrait;
+
+  /**
+   * Assert that a given path shows certain breadcrumb links.
+   *
+   * @param \Drupal\Core\Url|string $goto
+   *   (optional) A path or URL to pass to
+   *   Drupal\simpletest\WebTestBase::drupalGet().
+   * @param array $trail
+   *   An associative array whose keys are expected breadcrumb link paths and
+   *   whose values are expected breadcrumb link texts (not sanitized).
+   * @param string $page_title
+   *   (optional) A page title to additionally assert via
+   *   Drupal\simpletest\WebTestBase::assertTitle(). Without site name suffix.
+   * @param array $tree
+   *   (optional) An associative array whose keys are link paths and whose
+   *   values are link titles (not sanitized) of an expected active trail in a
+   *   menu tree output on the page.
+   * @param $last_active
+   *   (optional) Whether the last link in $tree is expected to be active (TRUE)
+   *   or just to be in the active trail (FALSE).
+   */
+  protected function assertBreadcrumb($goto, array $trail, $page_title = NULL, array $tree = [], $last_active = TRUE) {
+    if (isset($goto)) {
+      $this->drupalGet($goto);
+    }
+    $this->assertBreadcrumbParts($trail);
+
+    // Additionally assert page title, if given.
+    if (isset($page_title)) {
+      $this->assertTitle(strtr('@title | Drupal', ['@title' => $page_title]));
+    }
+
+    // Additionally assert active trail in a menu tree output, if given.
+    if ($tree) {
+      $this->assertMenuActiveTrail($tree, $last_active);
+    }
+  }
+
+  /**
+   * Assert that a trail exists in the internal browser.
+   *
+   * @param array $trail
+   *   An associative array whose keys are expected breadcrumb link paths and
+   *   whose values are expected breadcrumb link texts (not sanitized).
+   */
+  protected function assertBreadcrumbParts($trail) {
+    // Compare paths with actual breadcrumb.
+    $parts = $this->getBreadcrumbParts();
+    $pass = TRUE;
+    // There may be more than one breadcrumb on the page. If $trail is empty
+    // this test would go into an infinite loop, so we need to check that too.
+    while ($trail && !empty($parts)) {
+      foreach ($trail as $path => $title) {
+        // If the path is empty, generate the path from the <front> route.  If
+        // the path does not start with a leading slash, then run it through
+        // Url::fromUri('base:')->toString() to get the correct base
+        // prepended.
+        if ($path == '') {
+          $url = Url::fromRoute('<front>')->toString();
+        }
+        elseif ($path[0] != '/') {
+          $url = Url::fromUri('base:' . $path)->toString();
+        }
+        else {
+          $url = $path;
+        }
+        $part = array_shift($parts);
+        $pass = ($pass && $part['href'] === $url && $part['text'] === Html::escape($title));
+      }
+    }
+    // No parts must be left, or an expected "Home" will always pass.
+    $pass = ($pass && empty($parts));
+
+    $this->assertTrue($pass, format_string('Breadcrumb %parts found on @path.', [
+      '%parts' => implode(' » ', $trail),
+      '@path' => $this->getUrl(),
+    ]));
+  }
+
+  /**
+   * Returns the breadcrumb contents of the current page in the internal browser.
+   */
+  protected function getBreadcrumbParts() {
+    $parts = [];
+    $elements = $this->xpath('//nav[@class="breadcrumb"]/ol/li/a');
+    if (!empty($elements)) {
+      foreach ($elements as $element) {
+        $parts[] = [
+          'text' => (string) $element,
+          'href' => (string) $element['href'],
+          'title' => (string) $element['title'],
+        ];
+      }
+    }
+    return $parts;
+  }
+
+}