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diff --git a/web/core/modules/config/tests/src/Functional/ConfigFormOverrideTest.php b/web/core/modules/config/tests/src/Functional/ConfigFormOverrideTest.php
new file mode 100644
index 000000000..3bba16daa
--- /dev/null
+++ b/web/core/modules/config/tests/src/Functional/ConfigFormOverrideTest.php
@@ -0,0 +1,47 @@
+<?php
+
+namespace Drupal\Tests\config\Functional;
+
+use Drupal\Tests\BrowserTestBase;
+
+/**
+ * Tests config overrides do not appear on forms that extend ConfigFormBase.
+ *
+ * @group config
+ * @see \Drupal\Core\Form\ConfigFormBase
+ */
+class ConfigFormOverrideTest extends BrowserTestBase {
+
+  /**
+   * Tests that overrides do not affect forms.
+   */
+  public function testFormsWithOverrides() {
+    $this->drupalLogin($this->drupalCreateUser(['access administration pages', 'administer site configuration']));
+
+    $overridden_name = 'Site name global conf override';
+
+    // Set up an override.
+    $settings['config']['system.site']['name'] = (object) [
+      'value' => $overridden_name,
+      'required' => TRUE,
+    ];
+    $this->writeSettings($settings);
+
+    // Test that everything on the form is the same, but that the override
+    // worked for the actual site name.
+    $this->drupalGet('admin/config/system/site-information');
+    $this->assertTitle('Basic site settings | ' . $overridden_name);
+    $elements = $this->xpath('//input[@name="site_name"]');
+    $this->assertIdentical($elements[0]->getValue(), 'Drupal');
+
+    // Submit the form and ensure the site name is not changed.
+    $edit = [
+      'site_name' => 'Custom site name',
+    ];
+    $this->drupalPostForm('admin/config/system/site-information', $edit, t('Save configuration'));
+    $this->assertTitle('Basic site settings | ' . $overridden_name);
+    $elements = $this->xpath('//input[@name="site_name"]');
+    $this->assertIdentical($elements[0]->getValue(), $edit['site_name']);
+  }
+
+}