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diff --git a/web/core/modules/system/tests/src/Functional/Form/RedirectTest.php b/web/core/modules/system/tests/src/Functional/Form/RedirectTest.php
new file mode 100644
index 000000000..a4c9e15b3
--- /dev/null
+++ b/web/core/modules/system/tests/src/Functional/Form/RedirectTest.php
@@ -0,0 +1,106 @@
+<?php
+
+namespace Drupal\Tests\system\Functional\Form;
+
+use Drupal\Tests\BrowserTestBase;
+
+/**
+ * Tests form redirection functionality.
+ *
+ * @group Form
+ */
+class RedirectTest extends BrowserTestBase {
+
+  /**
+   * Modules to enable.
+   *
+   * @var array
+   */
+  public static $modules = ['form_test', 'block'];
+
+  /**
+   * Tests form redirection.
+   */
+  public function testRedirect() {
+    $path = 'form-test/redirect';
+    $options = ['query' => ['foo' => 'bar']];
+    $options['absolute'] = TRUE;
+
+    // Test basic redirection.
+    $edit = [
+      'redirection' => TRUE,
+      'destination' => $this->randomMachineName(),
+    ];
+    $this->drupalPostForm($path, $edit, t('Submit'));
+    $this->assertUrl($edit['destination'], [], 'Basic redirection works.');
+
+
+    // Test without redirection.
+    $edit = [
+      'redirection' => FALSE,
+    ];
+    $this->drupalPostForm($path, $edit, t('Submit'));
+    $this->assertUrl($path, [], 'When redirect is set to FALSE, there should be no redirection.');
+
+    // Test redirection with query parameters.
+    $edit = [
+      'redirection' => TRUE,
+      'destination' => $this->randomMachineName(),
+    ];
+    $this->drupalPostForm($path, $edit, t('Submit'), $options);
+    $this->assertUrl($edit['destination'], [], 'Redirection with query parameters works.');
+
+    // Test without redirection but with query parameters.
+    $edit = [
+      'redirection' => FALSE,
+    ];
+    $this->drupalPostForm($path, $edit, t('Submit'), $options);
+    $this->assertUrl($path, $options, 'When redirect is set to FALSE, there should be no redirection, and the query parameters should be passed along.');
+
+    // Test redirection back to the original path.
+    $edit = [
+      'redirection' => TRUE,
+      'destination' => '',
+    ];
+    $this->drupalPostForm($path, $edit, t('Submit'));
+    $this->assertUrl($path, [], 'When using an empty redirection string, there should be no redirection.');
+
+    // Test redirection back to the original path with query parameters.
+    $edit = [
+      'redirection' => TRUE,
+      'destination' => '',
+    ];
+    $this->drupalPostForm($path, $edit, t('Submit'), $options);
+    $this->assertUrl($path, $options, 'When using an empty redirection string, there should be no redirection, and the query parameters should be passed along.');
+  }
+
+  /**
+   * Tests form redirection from 404/403 pages with the Block form.
+   */
+  public function testRedirectFromErrorPages() {
+    // Make sure the block containing the redirect form is placed.
+    $this->drupalPlaceBlock('redirect_form_block');
+
+    // Create a user that does not have permission to administer blocks.
+    $user = $this->drupalCreateUser(['administer themes']);
+    $this->drupalLogin($user);
+
+    // Visit page 'foo' (404 page) and submit the form. Verify it ends up
+    // at the right URL.
+    $expected = \Drupal::url('form_test.route1', [], ['query' => ['test1' => 'test2'], 'absolute' => TRUE]);
+    $this->drupalGet('foo');
+    $this->assertResponse(404);
+    $this->drupalPostForm(NULL, [], t('Submit'));
+    $this->assertResponse(200);
+    $this->assertUrl($expected, [], 'Redirected to correct URL/query.');
+
+    // Visit the block admin page (403 page) and submit the form. Verify it
+    // ends up at the right URL.
+    $this->drupalGet('admin/structure/block');
+    $this->assertResponse(403);
+    $this->drupalPostForm(NULL, [], t('Submit'));
+    $this->assertResponse(200);
+    $this->assertUrl($expected, [], 'Redirected to correct URL/query.');
+  }
+
+}