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diff --git a/web/core/modules/config/tests/src/Functional/ConfigExportUITest.php b/web/core/modules/config/tests/src/Functional/ConfigExportUITest.php
new file mode 100644
index 000000000..d92071e89
--- /dev/null
+++ b/web/core/modules/config/tests/src/Functional/ConfigExportUITest.php
@@ -0,0 +1,94 @@
+<?php
+
+namespace Drupal\Tests\config\Functional;
+
+use Drupal\Core\Archiver\Tar;
+use Drupal\Core\Serialization\Yaml;
+use Drupal\Tests\BrowserTestBase;
+
+/**
+ * Tests the user interface for exporting configuration.
+ *
+ * @group config
+ */
+class ConfigExportUITest extends BrowserTestBase {
+
+  /**
+   * Modules to enable.
+   *
+   * @var array
+   */
+  public static $modules = ['config', 'config_test'];
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUp() {
+    parent::setUp();
+
+    // Set up an override.
+    $settings['config']['system.maintenance']['message'] = (object) [
+      'value' => 'Foo',
+      'required' => TRUE,
+    ];
+    $this->writeSettings($settings);
+
+    $this->drupalLogin($this->drupalCreateUser(['export configuration']));
+  }
+
+  /**
+   * Tests export of configuration.
+   */
+  public function testExport() {
+    // Verify the export page with export submit button is available.
+    $this->drupalGet('admin/config/development/configuration/full/export');
+    $this->assertFieldById('edit-submit', t('Export'));
+
+    // Submit the export form and verify response. This will create a file in
+    // temporary directory with the default name config.tar.gz.
+    $this->drupalPostForm('admin/config/development/configuration/full/export', [], t('Export'));
+    $this->assertResponse(200, 'User can access the download callback.');
+
+    // Test if header contains file name with hostname and timestamp.
+    $request = \Drupal::request();
+    $hostname = str_replace('.', '-', $request->getHttpHost());
+    $header_content_disposition = $this->drupalGetHeader('content-disposition');
+    $header_match = (boolean) preg_match('/attachment; filename="config-' . preg_quote($hostname) . '-\d{4}-\d{2}-\d{2}-\d{2}-\d{2}\.tar\.gz"/', $header_content_disposition);
+    $this->assertTrue($header_match, "Header with filename matches the expected format.");
+
+    // Extract the archive and verify it's not empty.
+    $file_path = file_directory_temp() . '/' . 'config.tar.gz';
+    $archiver = new Tar($file_path);
+    $archive_contents = $archiver->listContents();
+    $this->assert(!empty($archive_contents), 'Downloaded archive file is not empty.');
+
+    // Prepare the list of config files from active storage, see
+    // \Drupal\config\Controller\ConfigController::downloadExport().
+    $storage_active = $this->container->get('config.storage');
+    $config_files = [];
+    foreach ($storage_active->listAll() as $config_name) {
+      $config_files[] = $config_name . '.yml';
+    }
+    // Assert that the downloaded archive file contents are the same as the test
+    // site active store.
+    $this->assertIdentical($archive_contents, $config_files);
+
+    // Ensure the test configuration override is in effect but was not exported.
+    $this->assertIdentical(\Drupal::config('system.maintenance')->get('message'), 'Foo');
+    $archiver->extract(file_directory_temp(), ['system.maintenance.yml']);
+    $file_contents = file_get_contents(file_directory_temp() . '/' . 'system.maintenance.yml');
+    $exported = Yaml::decode($file_contents);
+    $this->assertNotIdentical($exported['message'], 'Foo');
+
+    // Check the single export form doesn't have "form-required" elements.
+    $this->drupalGet('admin/config/development/configuration/single/export');
+    $this->assertNoRaw('js-form-required form-required', 'No form required fields are found.');
+
+    // Ensure the temporary file is not available to users without the
+    // permission.
+    $this->drupalLogout();
+    $this->drupalGet('system/temporary', ['query' => ['file' => 'config.tar.gz']]);
+    $this->assertResponse(403);
+  }
+
+}