diff --git a/core/lib/Drupal/Core/Test/FunctionalTestSetupTrait.php b/core/lib/Drupal/Core/Test/FunctionalTestSetupTrait.php
index c481b8b15e0ae369947db78e0607798aa0786435..2afdbdc276c54e4bf535401f6741d5e441ffbe89 100644
--- a/core/lib/Drupal/Core/Test/FunctionalTestSetupTrait.php
+++ b/core/lib/Drupal/Core/Test/FunctionalTestSetupTrait.php
@@ -671,7 +671,6 @@ protected function prepareEnvironment() {
     $this->publicFilesDirectory = $this->siteDirectory . '/files';
     $this->privateFilesDirectory = $this->siteDirectory . '/private';
     $this->tempFilesDirectory = $this->siteDirectory . '/temp';
-    $this->translationFilesDirectory = $this->siteDirectory . '/translations';
 
     // Ensure the configImporter is refreshed for each test.
     $this->configImporter = NULL;
diff --git a/core/tests/Drupal/TestSite/Commands/TestSiteInstallCommand.php b/core/tests/Drupal/TestSite/Commands/TestSiteInstallCommand.php
index 582f395ebfbf985c82cbd4c8485e842716f940a3..cd6ab8b610f619ce4b39e81e5a7919a2d17c5a00 100644
--- a/core/tests/Drupal/TestSite/Commands/TestSiteInstallCommand.php
+++ b/core/tests/Drupal/TestSite/Commands/TestSiteInstallCommand.php
@@ -51,12 +51,6 @@ class TestSiteInstallCommand extends Command {
    */
   protected array $originalShutdownCallbacks = [];
 
-  /**
-   * The translation file directory for the test environment.
-   *
-   * This is set in BrowserTestBase::prepareEnvironment().
-   */
-  protected string $translationFilesDirectory;
 
   /**
    * The config importer that can be used in a test.
diff --git a/core/tests/Drupal/Tests/BrowserTestBase.php b/core/tests/Drupal/Tests/BrowserTestBase.php
index bb504266871811decd2afec07a239629464ec057..dbad4cecb5f7fe5ef4797d164d058f364f4ae67e 100644
--- a/core/tests/Drupal/Tests/BrowserTestBase.php
+++ b/core/tests/Drupal/Tests/BrowserTestBase.php
@@ -85,14 +85,6 @@ abstract class BrowserTestBase extends TestCase {
    */
   protected $timeLimit = 500;
 
-  /**
-   * The translation file directory for the test environment.
-   *
-   * This is set in BrowserTestBase::prepareEnvironment().
-   *
-   * @var string
-   */
-  protected $translationFilesDirectory;
 
   /**
    * The config importer that can be used in a test.