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diff --git a/web/core/tests/Drupal/Tests/Component/Discovery/YamlDiscoveryTest.php b/web/core/tests/Drupal/Tests/Component/Discovery/YamlDiscoveryTest.php
index 897a78898..2922586f0 100644
--- a/web/core/tests/Drupal/Tests/Component/Discovery/YamlDiscoveryTest.php
+++ b/web/core/tests/Drupal/Tests/Component/Discovery/YamlDiscoveryTest.php
@@ -2,18 +2,27 @@
 
 namespace Drupal\Tests\Component\Discovery;
 
-use Drupal\Tests\UnitTestCase;
 use Drupal\Component\Discovery\YamlDiscovery;
+use Drupal\Component\FileCache\FileCacheFactory;
 use org\bovigo\vfs\vfsStream;
 use org\bovigo\vfs\vfsStreamWrapper;
 use org\bovigo\vfs\vfsStreamDirectory;
+use PHPUnit\Framework\TestCase;
 
 /**
  * YamlDiscovery component unit tests.
  *
  * @group Discovery
  */
-class YamlDiscoveryTest extends UnitTestCase {
+class YamlDiscoveryTest extends TestCase {
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUp() {
+    // Ensure that FileCacheFactory has a prefix.
+    FileCacheFactory::setPrefix('prefix');
+  }
 
   /**
    * Tests the YAML file discovery.