--- /dev/null
+<?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.');
+ }
+
+}