diff --git a/core/tests/Drupal/Tests/Core/Asset/LibraryDiscoveryParserTest.php b/core/tests/Drupal/Tests/Core/Asset/LibraryDiscoveryParserTest.php
index 89a878c..f1a7146 100644
--- a/core/tests/Drupal/Tests/Core/Asset/LibraryDiscoveryParserTest.php
+++ b/core/tests/Drupal/Tests/Core/Asset/LibraryDiscoveryParserTest.php
@@ -10,10 +10,6 @@
 use Drupal\Core\Asset\LibraryDiscoveryParser;
 use Drupal\Tests\UnitTestCase;
 
-if (!defined('DRUPAL_ROOT')) {
-  define('DRUPAL_ROOT', dirname(dirname(substr(__DIR__, 0, -strlen(__NAMESPACE__)))));
-}
-
 if (!defined('CSS_AGGREGATE_DEFAULT')) {
   define('CSS_AGGREGATE_DEFAULT', 0);
   define('CSS_AGGREGATE_THEME', 100);
diff --git a/core/tests/Drupal/Tests/Core/Entity/EntityManagerTest.php b/core/tests/Drupal/Tests/Core/Entity/EntityManagerTest.php
index 39431ab..9163a6d 100644
--- a/core/tests/Drupal/Tests/Core/Entity/EntityManagerTest.php
+++ b/core/tests/Drupal/Tests/Core/Entity/EntityManagerTest.php
@@ -1537,9 +1537,6 @@ public function loadMultiple(array $ids = NULL) {
   }
 }
 
-if (!defined('DRUPAL_ROOT')) {
-  define('DRUPAL_ROOT', dirname(dirname(substr(__DIR__, 0, -strlen(__NAMESPACE__)))));
-}
 }
 
 namespace {
diff --git a/core/tests/Drupal/Tests/Core/Extension/ThemeHandlerTest.php b/core/tests/Drupal/Tests/Core/Extension/ThemeHandlerTest.php
index 0627137..eb6cb0e 100644
--- a/core/tests/Drupal/Tests/Core/Extension/ThemeHandlerTest.php
+++ b/core/tests/Drupal/Tests/Core/Extension/ThemeHandlerTest.php
@@ -373,9 +373,6 @@ protected function systemListReset() {
 if (!defined('DRUPAL_PHP_FUNCTION_PATTERN')) {
   define('DRUPAL_PHP_FUNCTION_PATTERN', '[a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*');
 }
-if (!defined('DRUPAL_ROOT')) {
-  define('DRUPAL_ROOT', dirname(dirname(substr(__DIR__, 0, -strlen(__NAMESPACE__)))));
-}
 if (!defined('DRUPAL_MINIMUM_PHP')) {
   define('DRUPAL_MINIMUM_PHP', '5.3.10');
 }
diff --git a/core/tests/Drupal/Tests/Core/Menu/LocalTaskIntegrationTest.php b/core/tests/Drupal/Tests/Core/Menu/LocalTaskIntegrationTest.php
index 0c337c7..8470a6f 100644
--- a/core/tests/Drupal/Tests/Core/Menu/LocalTaskIntegrationTest.php
+++ b/core/tests/Drupal/Tests/Core/Menu/LocalTaskIntegrationTest.php
@@ -14,10 +14,6 @@
 use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\HttpFoundation\RequestStack;
 
-if (!defined('DRUPAL_ROOT')) {
-  define('DRUPAL_ROOT', dirname(dirname(substr(__DIR__, 0, -strlen(__NAMESPACE__)))));
-}
-
 /**
  * Defines a base unit test for testing existence of local tasks.
  *
diff --git a/core/tests/Drupal/Tests/Core/Plugin/DefaultPluginManagerTest.php b/core/tests/Drupal/Tests/Core/Plugin/DefaultPluginManagerTest.php
index 7f7d3ac..1eb0d26 100644
--- a/core/tests/Drupal/Tests/Core/Plugin/DefaultPluginManagerTest.php
+++ b/core/tests/Drupal/Tests/Core/Plugin/DefaultPluginManagerTest.php
@@ -208,7 +208,3 @@ public function testCacheClearWithTags() {
   }
 
 }
-
-if (!defined('DRUPAL_ROOT')) {
-  define('DRUPAL_ROOT', dirname(dirname(substr(__DIR__, 0, -strlen(__NAMESPACE__)))));
-}
diff --git a/core/tests/Drupal/Tests/Core/Theme/RegistryTest.php b/core/tests/Drupal/Tests/Core/Theme/RegistryTest.php
index fe42e81..eb8881d 100644
--- a/core/tests/Drupal/Tests/Core/Theme/RegistryTest.php
+++ b/core/tests/Drupal/Tests/Core/Theme/RegistryTest.php
@@ -127,7 +127,3 @@ protected function initializeTheme() {
   }
 
 }
-
-if (!defined('DRUPAL_ROOT')) {
-  define('DRUPAL_ROOT', dirname(dirname(substr(__DIR__, 0, -strlen(__NAMESPACE__)))));
-}