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diff --git a/web/core/modules/language/tests/src/Functional/LanguageCustomLanguageConfigurationTest.php b/web/core/modules/language/tests/src/Functional/LanguageCustomLanguageConfigurationTest.php
new file mode 100644
index 000000000..a0510beca
--- /dev/null
+++ b/web/core/modules/language/tests/src/Functional/LanguageCustomLanguageConfigurationTest.php
@@ -0,0 +1,101 @@
+<?php
+
+namespace Drupal\Tests\language\Functional;
+
+use Drupal\Core\Language\Language;
+use Drupal\Core\Language\LanguageInterface;
+use Drupal\Tests\BrowserTestBase;
+
+/**
+ * Adds and configures custom languages.
+ *
+ * @group language
+ */
+class LanguageCustomLanguageConfigurationTest extends BrowserTestBase {
+
+  /**
+   * Modules to enable.
+   *
+   * @var array
+   */
+  public static $modules = ['language'];
+
+  /**
+   * Functional tests for adding, editing and deleting languages.
+   */
+  public function testLanguageConfiguration() {
+
+    // Create user with permissions to add and remove languages.
+    $admin_user = $this->drupalCreateUser(['administer languages', 'access administration pages']);
+    $this->drupalLogin($admin_user);
+
+    // Add custom language.
+    $edit = [
+      'predefined_langcode' => 'custom',
+    ];
+    $this->drupalPostForm('admin/config/regional/language/add', $edit, t('Add custom language'));
+    // Test validation on missing values.
+    $this->assertText(t('@name field is required.', ['@name' => t('Language code')]));
+    $this->assertText(t('@name field is required.', ['@name' => t('Language name')]));
+    $empty_language = new Language();
+    $this->assertFieldChecked('edit-direction-' . $empty_language->getDirection(), 'Consistent usage of language direction.');
+    $this->assertUrl(\Drupal::url('language.add', [], ['absolute' => TRUE]), [], 'Correct page redirection.');
+
+    // Test validation of invalid values.
+    $edit = [
+      'predefined_langcode' => 'custom',
+      'langcode' => 'white space',
+      'label' => '<strong>evil markup</strong>',
+      'direction' => LanguageInterface::DIRECTION_LTR,
+    ];
+    $this->drupalPostForm('admin/config/regional/language/add', $edit, t('Add custom language'));
+
+    $this->assertRaw(t('%field must be a valid language tag as <a href=":url">defined by the W3C</a>.', [
+      '%field' => t('Language code'),
+      ':url' => 'http://www.w3.org/International/articles/language-tags/',
+    ]));
+
+    $this->assertRaw(t('%field cannot contain any markup.', ['%field' => t('Language name')]));
+    $this->assertUrl(\Drupal::url('language.add', [], ['absolute' => TRUE]), [], 'Correct page redirection.');
+
+    // Test adding a custom language with a numeric region code.
+    $edit = [
+      'predefined_langcode' => 'custom',
+      'langcode' => 'es-419',
+      'label' => 'Latin American Spanish',
+      'direction' => LanguageInterface::DIRECTION_LTR,
+    ];
+
+    $this->drupalPostForm('admin/config/regional/language/add', $edit, t('Add custom language'));
+    $this->assertRaw(t(
+      'The language %language has been created and can now be used.',
+      ['%language' => $edit['label']]
+    ));
+    $this->assertUrl(\Drupal::url('entity.configurable_language.collection', [], ['absolute' => TRUE]), [], 'Correct page redirection.');
+
+    // Test validation of existing language values.
+    $edit = [
+      'predefined_langcode' => 'custom',
+      'langcode' => 'de',
+      'label' => 'German',
+      'direction' => LanguageInterface::DIRECTION_LTR,
+    ];
+
+    // Add the language the first time.
+    $this->drupalPostForm('admin/config/regional/language/add', $edit, t('Add custom language'));
+    $this->assertRaw(t(
+      'The language %language has been created and can now be used.',
+      ['%language' => $edit['label']]
+    ));
+    $this->assertUrl(\Drupal::url('entity.configurable_language.collection', [], ['absolute' => TRUE]), [], 'Correct page redirection.');
+
+    // Add the language a second time and confirm that this is not allowed.
+    $this->drupalPostForm('admin/config/regional/language/add', $edit, t('Add custom language'));
+    $this->assertRaw(t(
+      'The language %language (%langcode) already exists.',
+      ['%language' => $edit['label'], '%langcode' => $edit['langcode']]
+    ));
+    $this->assertUrl(\Drupal::url('language.add', [], ['absolute' => TRUE]), [], 'Correct page redirection.');
+  }
+
+}