diff --git a/core/modules/aggregator/tests/src/Functional/ImportOpmlTest.php b/core/modules/aggregator/tests/src/Functional/ImportOpmlTest.php
index 7c6ba1c878..e9037175ed 100644
--- a/core/modules/aggregator/tests/src/Functional/ImportOpmlTest.php
+++ b/core/modules/aggregator/tests/src/Functional/ImportOpmlTest.php
@@ -2,6 +2,8 @@
 
 namespace Drupal\Tests\aggregator\Functional;
 
+use Drupal\Core\Database\Database;
+
 /**
  * Tests OPML import.
  *
@@ -70,7 +72,7 @@ public function validateImportFormFields() {
    * Submits form with invalid, empty, and valid OPML files.
    */
   protected function submitImportForm() {
-    $connection = \Drupal::database();
+    $connection = Database::getConnection();
     $before = db_query('SELECT COUNT(*) FROM {aggregator_feed}')->fetchField();
 
     $form['files[upload]'] = $this->getInvalidOpml();
diff --git a/core/modules/dblog/tests/src/Functional/DbLogTest.php b/core/modules/dblog/tests/src/Functional/DbLogTest.php
index 53ebd8f374..075adb255a 100644
--- a/core/modules/dblog/tests/src/Functional/DbLogTest.php
+++ b/core/modules/dblog/tests/src/Functional/DbLogTest.php
@@ -4,6 +4,7 @@
 
 use Drupal\Component\Utility\Html;
 use Drupal\Component\Utility\Unicode;
+use Drupal\Core\Database\Database;
 use Drupal\Core\Logger\RfcLogLevel;
 use Drupal\Core\Url;
 use Drupal\dblog\Controller\DbLogController;
@@ -554,7 +555,7 @@ public function testFilter() {
     $this->drupalLogin($this->adminUser);
 
     // Clear the log to ensure that only generated entries will be found.
-    \Drupal::database()->delete('watchdog')->execute();
+    Database::getConnection()->delete('watchdog')->execute();
 
     // Generate 9 random watchdog entries.
     $type_names = [];
diff --git a/core/modules/tracker/tests/src/Functional/TrackerTest.php b/core/modules/tracker/tests/src/Functional/TrackerTest.php
index 37c3602318..4302ce3d2c 100644
--- a/core/modules/tracker/tests/src/Functional/TrackerTest.php
+++ b/core/modules/tracker/tests/src/Functional/TrackerTest.php
@@ -5,6 +5,7 @@
 use Drupal\comment\CommentInterface;
 use Drupal\comment\Tests\CommentTestTrait;
 use Drupal\Core\Cache\Cache;
+use Drupal\Core\Database\Database;
 use Drupal\Core\EventSubscriber\MainContentViewSubscriber;
 use Drupal\Core\Session\AccountInterface;
 use Drupal\field\Entity\FieldStorageConfig;
@@ -373,7 +374,7 @@ public function testTrackerCronIndexing() {
     \Drupal::state()->set('tracker.index_nid', 4);
 
     // Clear the current tracker tables and rebuild them.
-    $connection = \Drupal::database();
+    $connection = Database::getConnection();
     $connection->delete('tracker_node')
       ->execute();
     $connection->delete('tracker_user')