fix(http): null for enums values in request bodies (#1498)

Author: brendt

packages/validation/src/Rules/IsEnum.php

@@ -82,6 +82,10 @@ private function isDesirable($value): bool
 
     private function retrieveEnumValue(mixed $value): mixed
     {
+        if ($value === null) {
+            return null;
+        }
+
         if (method_exists($this->enum, 'tryFrom')) {
             return $this->enum::tryFrom($value);
         }

tests/Integration/Route/RequestToObjectMapperTest.php

@@ -132,4 +132,15 @@ public function test_reserved_properties_cannot_be_mapped(): void
             },
         );
     }
+
+    public function test_missing_enum_value(): void
+    {
+        $request = new GenericRequest(method: Method::POST, uri: '/', body: []);
+
+        try {
+            map($request)->to(RequestWithEnum::class);
+        } catch (ValidationFailed $validationFailed) {
+            $this->assertInstanceOf(NotNull::class, $validationFailed->failingRules['enumParam'][0]);
+        }
+    }
 }