skip when cache has no namespaces

Author: Litarnus

tests/End2End/TracingCacheEnd2EndTest.php

@@ -230,9 +230,16 @@ public function testNamespacedTagAwareCache(): void
             $this->markTestSkipped('Namespaced caches are not supported by this Symfony version.');
         }
 
-        $client = static::createClient(['debug' => false]);
+        $client = static::createClient(['debug' => true]);
+        $cache = static::getContainer()->get('cache.app.taggable');
+
+        // make sure that the configured taggable cache supports namespaces before running this test
+        if (!$cache instanceof \Symfony\Contracts\Cache\NamespacedPoolInterface) {
+            $this->markTestSkipped('The configured tag-aware cache pool does not support namespaces.');
+        }
 
         $client->request('GET', '/tracing/cache/namespaced/populate');
+        $this->assertSame('', $client->getResponse()->getContent());
         $this->assertSame(200, $client->getResponse()->getStatusCode());
 
         $this->assertCount(1, StubTransport::$events);