diff --git a/core/modules/language/src/Tests/LanguageBrowserDetectionUnitTest.php b/core/modules/language/src/Tests/LanguageBrowserDetectionUnitTest.php
index 8bcf6e8..f724338 100644
--- a/core/modules/language/src/Tests/LanguageBrowserDetectionUnitTest.php
+++ b/core/modules/language/src/Tests/LanguageBrowserDetectionUnitTest.php
@@ -192,6 +192,8 @@ function testUIBrowserLanguageMappings() {
     );
     $this->assertRaw(t('The mapping for the %browser browser language code has been deleted.', $t_args), 'The test browser language code has been deleted.');
 
+    // Check we went back to the browser negotiation mapping overview.
+    $this->assertUrl(\Drupal::url('language.negotiation_browser', [], ['absolute' => TRUE]));
     // Check that ch-zn no longer exists.
     $this->assertNoField('edit-mappings-zh-cn-browser-langcode', 'Chinese browser language code no longer exists.');
 
@@ -201,7 +203,7 @@ function testUIBrowserLanguageMappings() {
       'new_mapping[drupal_langcode]' => 'en',
     );
     $this->drupalPostForm('admin/config/regional/language/detection/browser', $edit, t('Save configuration'));
-    $this->drupalGet('admin/config/regional/language/detection/browser');
+    $this->assertUrl(\Drupal::url('language.negotiation_browser', [], ['absolute' => TRUE]));
     $this->assertField('edit-mappings-xx-browser-langcode', 'xx', 'Browser language code found.');
     $this->assertField('edit-mappings-xx-drupal-langcode', 'en', 'Drupal language code found.');
 
@@ -223,7 +225,7 @@ function testUIBrowserLanguageMappings() {
       'mappings[xx][drupal_langcode]' => 'zh-hans',
     );
     $this->drupalPostForm('admin/config/regional/language/detection/browser', $edit, t('Save configuration'));
-    $this->drupalGet('admin/config/regional/language/detection/browser');
+    $this->assertUrl(\Drupal::url('language.negotiation_browser', [], ['absolute' => TRUE]));
     $this->assertField('edit-mappings-xx-browser-langcode', 'xx', 'Browser language code found.');
     $this->assertField('edit-mappings-xx-drupal-langcode', 'zh-hans', 'Drupal language code found.');
   }