diff --git a/src/Symfony/Component/Cache/Tests/Adapter/Psr16AdapterTest.php b/src/Symfony/Component/Cache/Tests/Adapter/Psr16AdapterTest.php
index 19907ddf78733..e67a9962ec6d8 100644
--- a/src/Symfony/Component/Cache/Tests/Adapter/Psr16AdapterTest.php
+++ b/src/Symfony/Component/Cache/Tests/Adapter/Psr16AdapterTest.php
@@ -14,6 +14,7 @@
 use Symfony\Component\Cache\Adapter\FilesystemAdapter;
 use Symfony\Component\Cache\Adapter\Psr16Adapter;
 use Symfony\Component\Cache\Psr16Cache;
+use Symfony\Component\Debug\BufferingLogger;
 
 /**
  * @group time-sensitive
@@ -28,4 +29,20 @@ public function createCachePool($defaultLifetime = 0)
     {
         return new Psr16Adapter(new Psr16Cache(new FilesystemAdapter()), '', $defaultLifetime);
     }
+
+    public function testValidCacheKeyWithNamespace()
+    {
+        $logger = new BufferingLogger();
+        $cache = new Psr16Adapter(new Psr16Cache(new FilesystemAdapter()), 'some_namespace', 0);
+        $cache->setLogger($logger);
+        $this->assertSame('foo', $cache->get('my_key', function () {
+            return 'foo';
+        }));
+        $logs = $logger->cleanLogs();
+        foreach ($logs as $log) {
+            if ('warning' === $log[0] || 'error' === $log[0]) {
+                $this->fail('An error was triggered while caching key with a namespace: '.$log[1]);
+            }
+        }
+    }
 }