diff -u b/core/modules/views/tests/src/Unit/Plugin/views/field/LinkBaseTest.php b/core/modules/views/tests/src/Unit/Plugin/views/field/LinkBaseTest.php
--- b/core/modules/views/tests/src/Unit/Plugin/views/field/LinkBaseTest.php
+++ b/core/modules/views/tests/src/Unit/Plugin/views/field/LinkBaseTest.php
@@ -7,6 +7,7 @@
 use Drupal\Core\Entity\EntityRepositoryInterface;
 use Drupal\Core\Entity\EntityTypeManagerInterface;
 use Drupal\Core\Language\LanguageManagerInterface;
+use Drupal\Core\Render\RendererInterface;
 use Drupal\Core\StringTranslation\TranslationInterface;
 use Drupal\Tests\UnitTestCase;
 use Drupal\views\Plugin\views\display\DisplayPluginBase;
@@ -37,6 +38,7 @@
     $row = new ResultRow();
     $container = new ContainerBuilder();
     $container->set('string_translation', $this->createMock(TranslationInterface::class));
+    $container->set('renderer', $this->createMock(RendererInterface::class));
     \Drupal::setContainer($container);
 
     $access = new AccessResultAllowed();
@@ -64,7 +66,8 @@
     $display = $this->createMock(DisplayPluginBase::class);
 
     $field->init($view, $display);
-    $this->assertEquals('', $field->render($row));
+    $field_built = $field->render($row);
+    $this->assertEquals('', \Drupal::service('renderer')->render($field_built));
   }
 
 }