diff --git a/tests/Serializer/PayloadNormalizerTest.php b/tests/Serializer/PayloadNormalizerTest.php
index bc5d2f8..ee1be2d 100644
--- a/tests/Serializer/PayloadNormalizerTest.php
+++ b/tests/Serializer/PayloadNormalizerTest.php
@@ -62,6 +62,11 @@ public function testSupportsDenormalization()
         $this->assertTrue($this->serializer->supportsDenormalization($payload, ContactByIdentityQuery::class));
     }
 
+    public function testSupportsDenormalizationNoClass()
+    {
+        $this->assertFalse($this->serializer->supportsDenormalization(['id' => 123], 'foo'));
+    }
+
     public function testDenormalize()
     {
         $payload = [