diff --git a/core/modules/config_translation/tests/src/Functional/ConfigTranslationUiThemeTest.php b/core/modules/config_translation/tests/src/Functional/ConfigTranslationUiThemeTest.php
index 04227c6370da23038fc1dd2c5aa1d643117fedfa..0ebd70b7f4153594f24c69b38726d40fda4baa27 100644
--- a/core/modules/config_translation/tests/src/Functional/ConfigTranslationUiThemeTest.php
+++ b/core/modules/config_translation/tests/src/Functional/ConfigTranslationUiThemeTest.php
@@ -73,7 +73,7 @@ public function testThemeDiscovery() {
 
     $this->drupalGet('admin/appearance');
     $element = $this->assertSession()->elementExists('xpath', "//a[normalize-space()='Install and set as default' and contains(@href, '{$theme}')]");
-    $this->drupalGet($GLOBALS['base_root'] . $element->getAttribute('href'), ['external' => TRUE]);
+    $this->drupalGet($this->getAbsoluteUrl($element->getAttribute('href')), ['external' => TRUE]);
 
     $translation_base_url = 'admin/config/development/performance/translate';
     $this->drupalGet($translation_base_url);
diff --git a/core/modules/system/tests/src/Functional/Pager/PagerTest.php b/core/modules/system/tests/src/Functional/Pager/PagerTest.php
index 02f6263d5e79665a8cc5fa70491f27170b436136..9686d44dbb68e1bb54f1c218d1887b504365ecfd 100644
--- a/core/modules/system/tests/src/Functional/Pager/PagerTest.php
+++ b/core/modules/system/tests/src/Functional/Pager/PagerTest.php
@@ -73,7 +73,7 @@ public function testActiveClass() {
     $element = $this->assertSession()->elementExists('xpath', '//li[contains(@class, "pager__item--last")]/a');
     preg_match('@page=(\d+)@', $element->getAttribute('href'), $matches);
     $current_page = (int) $matches[1];
-    $this->drupalGet($GLOBALS['base_root'] . parse_url($this->getUrl())['path'] . $element->getAttribute('href'), ['external' => TRUE]);
+    $this->drupalGet($this->getAbsoluteUrl(parse_url($this->getUrl())['path'] . $element->getAttribute('href')), ['external' => TRUE]);
     $this->assertPagerItems($current_page);
 
     // Verify the pager does not render on a list without pagination.
@@ -181,7 +181,7 @@ public function testMultiplePagers() {
     // (1-indexed) and resulting query parameter
     foreach ($test_data as $data) {
       $input_query = str_replace(' ', '%20', $data['input_query']);
-      $this->drupalGet($GLOBALS['base_root'] . parse_url($this->getUrl())['path'] . $input_query, ['external' => TRUE]);
+      $this->drupalGet($this->getAbsoluteUrl(parse_url($this->getUrl())['path'] . $input_query), ['external' => TRUE]);
       foreach ([0, 1, 4] as $pager_element) {
         $active_page = $this->cssSelect("div.test-pager-{$pager_element} ul.pager__items li.is-active:contains('{$data['expected_page'][$pager_element]}')");
         $destination = str_replace('%2C', ',', $active_page[0]->find('css', 'a')->getAttribute('href'));