Throw PhpWatchdogException at the end of the tearDown process

src/ExistingSiteBase.php

@@ -63,6 +63,7 @@ abstract class ExistingSiteBase extends TestCase implements LoggerInterface
    */
     protected function tearDown(): void
     {
+        $messages = [];
         if ($this->failOnPhpWatchdogMessages && \Drupal::database()->schema()->tableExists('watchdog')) {
             $messages = \Drupal::database()
                 ->select('watchdog', 'w')
@@ -80,13 +81,16 @@ abstract class ExistingSiteBase extends TestCase implements LoggerInterface
                     unset($error->variables);
                     print_r($error);
                 }
-                throw new PhpWatchdogException('PHP errors or warnings are introduced when running this test.');
             }
         }
 
         parent::tearDown();
         $this->tearDownDrupal();
         $this->tearDownMinkSession();
+
+        if (!empty($messages)) {
+            throw new PhpWatchdogException('PHP errors or warnings are introduced when running this test.');
+        }
     }
 
     /**