From a8dddc56ff977ca924afc4e99c6bf128af9fdbfc Mon Sep 17 00:00:00 2001
From: Massimiliano Arione <garakkio@gmail.com>
Date: Thu, 23 Apr 2020 10:04:29 +0200
Subject: [PATCH] improve check

---
 .../Bridge/PhpUnit/Legacy/SymfonyTestsListenerTrait.php   | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/src/Symfony/Bridge/PhpUnit/Legacy/SymfonyTestsListenerTrait.php b/src/Symfony/Bridge/PhpUnit/Legacy/SymfonyTestsListenerTrait.php
index beffc4c290d6e..d4840007473c6 100644
--- a/src/Symfony/Bridge/PhpUnit/Legacy/SymfonyTestsListenerTrait.php
+++ b/src/Symfony/Bridge/PhpUnit/Legacy/SymfonyTestsListenerTrait.php
@@ -49,8 +49,12 @@ public function __construct(array $mockedNamespaces = array())
             \PHPUnit_Util_Blacklist::$blacklistedClassNames['\Symfony\Bridge\PhpUnit\Legacy\SymfonyTestsListenerTrait'] = 2;
         } elseif (method_exists(Blacklist::class, 'addDirectory')) {
             Blacklist::addDirectory('\Symfony\Bridge\PhpUnit\Legacy\SymfonyTestsListenerTrait');
-        } else {
-            Blacklist::$blacklistedClassNames['\Symfony\Bridge\PhpUnit\Legacy\SymfonyTestsListenerTrait'] = 2;
+        } elseif (class_exists(Blacklist::class)) {
+            if (method_exists(Blacklist::class, 'addDirectory')) {
+                Blacklist::addDirectory($className);
+            } else {
+                Blacklist::$blacklistedClassNames[$className] = 2;
+            }
         }
 
         $warn = false;