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diff --git a/web/modules/contrib/redirect/src/Tests/AssertRedirectTrait.php b/web/modules/contrib/redirect/src/Tests/AssertRedirectTrait.php
new file mode 100644
index 000000000..ae9368886
--- /dev/null
+++ b/web/modules/contrib/redirect/src/Tests/AssertRedirectTrait.php
@@ -0,0 +1,53 @@
+<?php
+
+namespace Drupal\redirect\Tests;
+
+use Drupal\Component\Utility\SafeMarkup;
+use Drupal\Core\Url;
+
+/**
+ * Asserts the redirect from a given path to the expected destination path.
+ */
+trait AssertRedirectTrait {
+
+  /**
+   * Asserts the redirect from $path to the $expected_ending_url.
+   *
+   * @param string $path
+   *   The request path.
+   * @param $expected_ending_url
+   *   The path where we expect it to redirect. If NULL value provided, no
+   *   redirect is expected.
+   * @param string $expected_ending_status
+   *   The status we expect to get with the first request.
+   */
+  public function assertRedirect($path, $expected_ending_url, $expected_ending_status = 'HTTP/1.1 301 Moved Permanently') {
+    $this->drupalHead($path);
+    $headers = $this->drupalGetHeaders(TRUE);
+
+    $ending_url = isset($headers[0]['location']) ? $headers[0]['location'] : NULL;
+    $message = SafeMarkup::format('Testing redirect from %from to %to. Ending url: %url', [
+      '%from' => $path,
+      '%to' => $expected_ending_url,
+      '%url' => $ending_url,
+    ]);
+
+    if ($expected_ending_url == '<front>') {
+      $expected_ending_url = Url::fromUri('base:')->setAbsolute()->toString();
+    }
+    elseif (!empty($expected_ending_url)) {
+      // Check for absolute/external urls.
+      if (!parse_url($expected_ending_url, PHP_URL_SCHEME)) {
+        $expected_ending_url = Url::fromUri('base:' . $expected_ending_url)->setAbsolute()->toString();
+      }
+    }
+    else {
+      $expected_ending_url = NULL;
+    }
+
+    $this->assertEqual($expected_ending_url, $ending_url, $message);
+
+    $this->assertEqual($headers[0][':status'], $expected_ending_status);
+  }
+
+}