diff --git a/core/modules/language/src/Tests/LanguageUILanguageNegotiationTest.php b/core/modules/language/src/Tests/LanguageUILanguageNegotiationTest.php
index 15d50fd..9388c61 100644
--- a/core/modules/language/src/Tests/LanguageUILanguageNegotiationTest.php
+++ b/core/modules/language/src/Tests/LanguageUILanguageNegotiationTest.php
@@ -463,27 +463,26 @@ function testLanguageDomain() {
     // Test URL in another language: http://it.example.com/admin.
     // Base path gives problems on the testbot, so $correct_link is hard-coded.
     // @see UrlAlterFunctionalTest::assertUrlOutboundAlter (path.test).
-    $italian_url = Url::fromRoute('system.admin', [], ['language' => $languages['it'], 'absolute' => TRUE])->toString();
+    $italian_url = Url::fromRoute('system.admin', [], ['language' => $languages['it']])->toString();
     $url_scheme = \Drupal::request()->isSecure() ? 'https://' : 'http://';
     $correct_link = $url_scheme . $link;
-    $this->assertEqual($italian_url, $correct_link, format_string('The _url() function returns the right URL (@url) in accordance with the chosen language', array('@url' => $italian_url)));
+    $this->assertEqual($italian_url, $correct_link, format_string('The Url::fromRoute() returns the right URL (@url) in accordance with the chosen language', array('@url' => $italian_url)));
 
     // Test HTTPS via options.
     $this->settingsSet('mixed_mode_sessions', TRUE);
     $this->rebuildContainer();
 
-    $italian_url = Url::fromRoute('system.admin', [], ['https' => TRUE, 'language' => $languages['it'], 'absolute' => TRUE])->toString();
+    $italian_url = Url::fromRoute('system.admin', [], ['https' => TRUE, 'language' => $languages['it']])->toString();
     $correct_link = 'https://' . $link;
-    $this->assertTrue($italian_url == $correct_link, format_string('The _url() function returns the right HTTPS URL (via options) (@url) in accordance with the chosen language', array('@url' => $italian_url)));
+    $this->assertTrue($italian_url == $correct_link, format_string('The Url::fromRoute() returns the right HTTPS URL (via options) (@url) in accordance with the chosen language', array('@url' => $italian_url)));
     $this->settingsSet('mixed_mode_sessions', FALSE);
 
     // Test HTTPS via current URL scheme.
     $request = Request::create('', 'GET', array(), array(), array(), array('HTTPS' => 'on'));
     $this->container->get('request_stack')->push($request);
-    $generator = $this->container->get('url_generator');
-    $italian_url = Url::fromRoute('system.admin', [], ['language' => $languages['it'], 'absolute' => TRUE])->toString();
+    $italian_url = Url::fromRoute('system.admin', [], ['language' => $languages['it']])->toString();
     $correct_link = 'https://' . $link;
-    $this->assertTrue($italian_url == $correct_link, format_string('The _url() function returns the right URL (via current URL scheme) (@url) in accordance with the chosen language', array('@url' => $italian_url)));
+    $this->assertTrue($italian_url == $correct_link, format_string('The Url::fromRoute() method returns the right URL (via current URL scheme) (@url) in accordance with the chosen language', array('@url' => $italian_url)));
   }
 
   /**
diff --git a/core/modules/system/src/Tests/Cache/PageCacheTagsIntegrationTest.php b/core/modules/system/src/Tests/Cache/PageCacheTagsIntegrationTest.php
index 5a19b46..d2b348c 100644
--- a/core/modules/system/src/Tests/Cache/PageCacheTagsIntegrationTest.php
+++ b/core/modules/system/src/Tests/Cache/PageCacheTagsIntegrationTest.php
@@ -140,12 +140,12 @@ function testPageCacheTags() {
    */
   protected function verifyPageCacheTags(Url $url, $expected_tags) {
     sort($expected_tags);
-    $this->drupalGet($url->toString());
+    $this->drupalGet($url->setAbsolute()->toString());
     $this->assertEqual($this->drupalGetHeader('X-Drupal-Cache'), 'MISS');
     $actual_tags = explode(' ', $this->drupalGetHeader('X-Drupal-Cache-Tags'));
     sort($actual_tags);
     $this->assertIdentical($actual_tags, $expected_tags);
-    $this->drupalGet($url->toString());
+    $this->drupalGet($url->setAbsolute()->toString());
     $actual_tags = explode(' ', $this->drupalGetHeader('X-Drupal-Cache-Tags'));
     sort($actual_tags);
     $this->assertEqual($this->drupalGetHeader('X-Drupal-Cache'), 'HIT');