[FrameworkBundle] ensureKernelShutdown in tearDownAfterClass

Author: cquintana92

Test/KernelTestCase.php

@@ -45,6 +45,14 @@ protected function tearDown(): void
         static::$booted = false;
     }
 
+    public static function tearDownAfterClass(): void
+    {
+        static::ensureKernelShutdown();
+        static::$class = null;
+        static::$kernel = null;
+        static::$booted = false;
+    }
+
     /**
      * @throws \RuntimeException
      * @throws \LogicException