diff -u b/core/tests/Drupal/KernelTests/Core/Database/ConnectionUnitTest.php b/core/tests/Drupal/KernelTests/Core/Database/ConnectionUnitTest.php
--- b/core/tests/Drupal/KernelTests/Core/Database/ConnectionUnitTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Database/ConnectionUnitTest.php
@@ -223,7 +223,7 @@
     $connection_property->setAccessible(TRUE);
     // Skip this test when a database driver does not implement PDO.
     // An alternative database driver that does not implement PDO
-    // should implement its own connection test."
+    // should implement its own connection test.
     if (get_class($connection_property->getValue($connection)) !== 'PDO') {
       $this->markTestSkipped('Ignored PDO connection unit test for this driver because it does not implement PDO.');
     }