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diff --git a/web/core/modules/system/tests/src/Functional/Form/RebuildTest.php b/web/core/modules/system/tests/src/Functional/Form/RebuildTest.php
new file mode 100644
index 000000000..3e951e2e8
--- /dev/null
+++ b/web/core/modules/system/tests/src/Functional/Form/RebuildTest.php
@@ -0,0 +1,61 @@
+<?php
+
+namespace Drupal\Tests\system\Functional\Form;
+
+use Drupal\Tests\BrowserTestBase;
+
+/**
+ * Tests functionality of \Drupal\Core\Form\FormBuilderInterface::rebuildForm().
+ *
+ * @group Form
+ */
+class RebuildTest extends BrowserTestBase {
+
+  /**
+   * Modules to enable.
+   *
+   * @var array
+   */
+  public static $modules = ['node', 'form_test'];
+
+  /**
+   * A user for testing.
+   *
+   * @var \Drupal\user\UserInterface
+   */
+  protected $webUser;
+
+  protected function setUp() {
+    parent::setUp();
+
+    $this->drupalCreateContentType(['type' => 'page', 'name' => 'Basic page']);
+
+    $this->webUser = $this->drupalCreateUser(['access content']);
+    $this->drupalLogin($this->webUser);
+  }
+
+  /**
+   * Tests preservation of values.
+   */
+  public function testRebuildPreservesValues() {
+    $edit = [
+      'checkbox_1_default_off' => TRUE,
+      'checkbox_1_default_on' => FALSE,
+      'text_1' => 'foo',
+    ];
+    $this->drupalPostForm('form-test/form-rebuild-preserve-values', $edit, 'Add more');
+
+    $assert_session = $this->assertSession();
+
+    // Verify that initial elements retained their submitted values.
+    $assert_session->checkboxChecked('edit-checkbox-1-default-off');
+    $assert_session->checkboxNotChecked('edit-checkbox-1-default-on');
+    $assert_session->fieldValueEquals('edit-text-1', 'foo');
+
+    // Verify that newly added elements were initialized with their default values.
+    $assert_session->checkboxChecked('edit-checkbox-2-default-on');
+    $assert_session->checkboxNotChecked('edit-checkbox-2-default-off');
+    $assert_session->fieldValueEquals('edit-text-2', 'DEFAULT 2');
+  }
+
+}