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diff --git a/web/core/modules/system/tests/modules/form_test/src/Form/FormTestRedirectForm.php b/web/core/modules/system/tests/modules/form_test/src/Form/FormTestRedirectForm.php
new file mode 100644
index 000000000..4768acf90
--- /dev/null
+++ b/web/core/modules/system/tests/modules/form_test/src/Form/FormTestRedirectForm.php
@@ -0,0 +1,62 @@
+<?php
+
+namespace Drupal\form_test\Form;
+
+use Drupal\Core\Form\FormBase;
+use Drupal\Core\Form\FormStateInterface;
+use Drupal\Core\Url;
+
+/**
+ * Form builder to detect form redirect.
+ */
+class FormTestRedirectForm extends FormBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getFormId() {
+    return 'form_test_redirect';
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function buildForm(array $form, FormStateInterface $form_state) {
+    $form['redirection'] = [
+      '#type' => 'checkbox',
+      '#title' => t('Use redirection'),
+    ];
+    $form['destination'] = [
+      '#type' => 'textfield',
+      '#title' => t('Redirect destination'),
+      '#states' => [
+        'visible' => [
+          ':input[name="redirection"]' => ['checked' => TRUE],
+        ],
+      ],
+    ];
+    $form['submit'] = [
+      '#type' => 'submit',
+      '#value' => t('Submit'),
+    ];
+
+    return $form;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function submitForm(array &$form, FormStateInterface $form_state) {
+    if (!$form_state->isValueEmpty('redirection')) {
+      if (!$form_state->isValueEmpty('destination')) {
+        // The destination is a random URL, so we can't use routed URLs.
+        // @todo Revist this in https://www.drupal.org/node/2418219.
+        $form_state->setRedirectUrl(Url::fromUserInput('/' . $form_state->getValue('destination')));
+      }
+    }
+    else {
+      $form_state->disableRedirect();
+    }
+  }
+
+}