Fix and add test

Author: VincentLanglet

src/aliases.php

@@ -45,7 +45,7 @@
 if (interface_exists(AdapterInterface::class)) {
     if (!class_exists(DoctrineProvider::class, false) && version_compare(\PHP_VERSION, '8.0.0', '>=')) {
         if (!class_exists(TraceableCacheAdapter::class, false)) {
-            if (class_exists(NamespacedPoolInterface::class, false)) {
+            if (interface_exists(NamespacedPoolInterface::class)) {
                 class_alias(TraceableCacheAdapterForV3WithNamespace::class, TraceableCacheAdapter::class);
             } else {
                 class_alias(TraceableCacheAdapterForV3::class, TraceableCacheAdapter::class);

tests/Tracing/Cache/TraceableCacheAdapterTest.php

@@ -6,6 +6,7 @@
 
 use Sentry\SentryBundle\Tracing\Cache\TraceableCacheAdapter;
 use Symfony\Component\Cache\Adapter\AdapterInterface;
+use Symfony\Contracts\Cache\NamespacedPoolInterface;
 
 /**
  * @phpstan-extends AbstractTraceableCacheAdapterTest<TraceableCacheAdapter, AdapterInterface>
@@ -27,4 +28,16 @@ protected static function getAdapterClassFqcn(): string
     {
         return AdapterInterface::class;
     }
+
+    public function testNamespacePoolImplementation(): void
+    {
+        if (!interface_exists(NamespacedPoolInterface::class)) {
+            $this->markTestSkipped('NamespacedPoolInterface does not exists.');
+        }
+
+        $decoratedAdapter = $this->createMock(static::getAdapterClassFqcn());
+        $adapter = $this->createCacheAdapter($decoratedAdapter);
+
+        static::assertInstanceOf(NamespacedPoolInterface::class, $adapter);
+    }
 }