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diff --git a/web/core/modules/language/tests/src/Unit/LanguageNegotiationUrlTest.php b/web/core/modules/language/tests/src/Unit/LanguageNegotiationUrlTest.php
new file mode 100644
index 000000000..825ca7d86
--- /dev/null
+++ b/web/core/modules/language/tests/src/Unit/LanguageNegotiationUrlTest.php
@@ -0,0 +1,262 @@
+<?php
+
+namespace Drupal\Tests\language\Unit;
+
+use Drupal\Core\Cache\Cache;
+use Drupal\Core\Language\LanguageInterface;
+use Drupal\Core\Render\BubbleableMetadata;
+use Drupal\Tests\UnitTestCase;
+use Drupal\language\Plugin\LanguageNegotiation\LanguageNegotiationUrl;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
+use Symfony\Component\HttpFoundation\Request;
+
+/**
+ * @coversDefaultClass \Drupal\language\Plugin\LanguageNegotiation\LanguageNegotiationUrl
+ * @group language
+ */
+class LanguageNegotiationUrlTest extends UnitTestCase {
+
+  protected $languageManager;
+  protected $user;
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUp() {
+
+    // Set up some languages to be used by the language-based path processor.
+    $language_de = $this->getMock('\Drupal\Core\Language\LanguageInterface');
+    $language_de->expects($this->any())
+      ->method('getId')
+      ->will($this->returnValue('de'));
+    $language_en = $this->getMock('\Drupal\Core\Language\LanguageInterface');
+    $language_en->expects($this->any())
+      ->method('getId')
+      ->will($this->returnValue('en'));
+    $languages = [
+      'de' => $language_de,
+      'en' => $language_en,
+    ];
+    $this->languages = $languages;
+
+    // Create a language manager stub.
+    $language_manager = $this->getMockBuilder('Drupal\language\ConfigurableLanguageManagerInterface')
+      ->getMock();
+    $language_manager->expects($this->any())
+      ->method('getLanguages')
+      ->will($this->returnValue($languages));
+    $this->languageManager = $language_manager;
+
+    // Create a user stub.
+    $this->user = $this->getMockBuilder('Drupal\Core\Session\AccountInterface')
+      ->getMock();
+
+    $cache_contexts_manager = $this->getMockBuilder('Drupal\Core\Cache\Context\CacheContextsManager')
+      ->disableOriginalConstructor()
+      ->getMock();
+    $cache_contexts_manager->method('assertValidTokens')->willReturn(TRUE);
+    $container = new ContainerBuilder();
+    $container->set('cache_contexts_manager', $cache_contexts_manager);
+    \Drupal::setContainer($container);
+  }
+
+  /**
+   * Test path prefix language negotiation and outbound path processing.
+   *
+   * @dataProvider providerTestPathPrefix
+   */
+  public function testPathPrefix($prefix, $prefixes, $expected_langcode) {
+    $this->languageManager->expects($this->any())
+      ->method('getCurrentLanguage')
+      ->will($this->returnValue($this->languages[(in_array($expected_langcode, ['en', 'de'])) ? $expected_langcode : 'en']));
+
+    $config = $this->getConfigFactoryStub([
+      'language.negotiation' => [
+        'url' => [
+          'source' => LanguageNegotiationUrl::CONFIG_PATH_PREFIX,
+          'prefixes' => $prefixes,
+        ],
+      ],
+    ]);
+
+    $request = Request::create('/' . $prefix . '/foo', 'GET');
+    $method = new LanguageNegotiationUrl();
+    $method->setLanguageManager($this->languageManager);
+    $method->setConfig($config);
+    $method->setCurrentUser($this->user);
+    $this->assertEquals($expected_langcode, $method->getLangcode($request));
+
+    $cacheability = new BubbleableMetadata();
+    $options = [];
+    $method->processOutbound('foo', $options, $request, $cacheability);
+    $expected_cacheability = new BubbleableMetadata();
+    if ($expected_langcode) {
+      $this->assertSame($prefix . '/', $options['prefix']);
+      $expected_cacheability->setCacheContexts(['languages:' . LanguageInterface::TYPE_URL]);
+    }
+    else {
+      $this->assertFalse(isset($options['prefix']));
+    }
+    $this->assertEquals($expected_cacheability, $cacheability);
+  }
+
+  /**
+   * Provides data for the path prefix test.
+   *
+   * @return array
+   *   An array of data for checking path prefix negotiation.
+   */
+  public function providerTestPathPrefix() {
+    $path_prefix_configuration[] = [
+      'prefix' => 'de',
+      'prefixes' => [
+        'de' => 'de',
+        'en-uk' => 'en',
+      ],
+      'expected_langcode' => 'de',
+    ];
+    $path_prefix_configuration[] = [
+      'prefix' => 'en-uk',
+      'prefixes' => [
+        'de' => 'de',
+        'en' => 'en-uk',
+      ],
+      'expected_langcode' => 'en',
+    ];
+    // No configuration.
+    $path_prefix_configuration[] = [
+      'prefix' => 'de',
+      'prefixes' => [],
+      'expected_langcode' => FALSE,
+    ];
+    // Non-matching prefix.
+    $path_prefix_configuration[] = [
+      'prefix' => 'de',
+      'prefixes' => [
+        'en-uk' => 'en',
+      ],
+      'expected_langcode' => FALSE,
+    ];
+    // Non-existing language.
+    $path_prefix_configuration[] = [
+      'prefix' => 'it',
+      'prefixes' => [
+        'it' => 'it',
+        'en-uk' => 'en',
+      ],
+      'expected_langcode' => FALSE,
+    ];
+    return $path_prefix_configuration;
+  }
+
+  /**
+   * Test domain language negotiation and outbound path processing.
+   *
+   * @dataProvider providerTestDomain
+   */
+  public function testDomain($http_host, $domains, $expected_langcode) {
+    $this->languageManager->expects($this->any())
+      ->method('getCurrentLanguage')
+      ->will($this->returnValue($this->languages['en']));
+
+    $config = $this->getConfigFactoryStub([
+      'language.negotiation' => [
+        'url' => [
+          'source' => LanguageNegotiationUrl::CONFIG_DOMAIN,
+          'domains' => $domains,
+        ],
+      ],
+    ]);
+
+    $request = Request::create('', 'GET', [], [], [], ['HTTP_HOST' => $http_host]);
+    $method = new LanguageNegotiationUrl();
+    $method->setLanguageManager($this->languageManager);
+    $method->setConfig($config);
+    $method->setCurrentUser($this->user);
+    $this->assertEquals($expected_langcode, $method->getLangcode($request));
+
+    $cacheability = new BubbleableMetadata();
+    $options = [];
+    $this->assertSame('foo', $method->processOutbound('foo', $options, $request, $cacheability));
+    $expected_cacheability = new BubbleableMetadata();
+    if ($expected_langcode !== FALSE && count($domains) > 1) {
+      $expected_cacheability->setCacheMaxAge(Cache::PERMANENT)->setCacheContexts(['languages:' . LanguageInterface::TYPE_URL, 'url.site']);
+    }
+    $this->assertEquals($expected_cacheability, $cacheability);
+  }
+
+  /**
+   * Provides data for the domain test.
+   *
+   * @return array
+   *   An array of data for checking domain negotiation.
+   */
+  public function providerTestDomain() {
+
+    $domain_configuration[] = [
+      'http_host' => 'example.de',
+      'domains' => [
+        'de' => 'http://example.de',
+      ],
+      'expected_langcode' => 'de',
+    ];
+    // No configuration.
+    $domain_configuration[] = [
+      'http_host' => 'example.de',
+      'domains' => [],
+      'expected_langcode' => FALSE,
+    ];
+    // HTTP host with a port.
+    $domain_configuration[] = [
+      'http_host' => 'example.de:8080',
+      'domains' => [
+        'de' => 'http://example.de',
+      ],
+      'expected_langcode' => 'de',
+    ];
+    // Domain configuration with https://.
+    $domain_configuration[] = [
+      'http_host' => 'example.de',
+      'domains' => [
+        'de' => 'https://example.de',
+      ],
+      'expected_langcode' => 'de',
+    ];
+    // Non-matching HTTP host.
+    $domain_configuration[] = [
+      'http_host' => 'example.com',
+      'domains' => [
+        'de' => 'http://example.com',
+      ],
+      'expected_langcode' => 'de',
+    ];
+    // Testing a non-existing language.
+    $domain_configuration[] = [
+      'http_host' => 'example.com',
+      'domains' => [
+        'it' => 'http://example.it',
+      ],
+      'expected_langcode' => FALSE,
+    ];
+    // Multiple domain configurations.
+    $domain_configuration[] = [
+      'http_host' => 'example.com',
+      'domains' => [
+        'de' => 'http://example.de',
+        'en' => 'http://example.com',
+      ],
+      'expected_langcode' => 'en',
+    ];
+    return $domain_configuration;
+  }
+
+}
+
+// @todo Remove as part of https://www.drupal.org/node/2481833.
+namespace Drupal\language\Plugin\LanguageNegotiation;
+
+if (!function_exists('base_path')) {
+  function base_path() {
+    return '/';
+  }
+}