fix(dojo-lang): ensure the dns returns the actual ClassHash.

crates/dojo/core-cairo-test/src/tests/world/world.cairo

@@ -9,7 +9,7 @@ use dojo::model::ModelStorage;
 use dojo::event::{Event, EventStorage};
 
 use crate::tests::helpers::{
-    IbarDispatcherTrait, drop_all_events, deploy_world_and_bar, Foo, m_Foo, test_contract,
+    bar, IbarDispatcherTrait, drop_all_events, deploy_world_and_bar, Foo, m_Foo, test_contract,
     test_contract_with_dojo_init_args, SimpleEvent, e_SimpleEvent, deploy_world,
 };
 use crate::{spawn_test_world, ContractDefTrait, NamespaceDef, TestResource, WorldStorageTestTrait};
@@ -311,3 +311,21 @@ fn test_can_call_init_only_world_args() {
         },
     }
 }
+
+#[test]
+pub fn dns_valid_class_hash() {
+    let namespace_def = NamespaceDef {
+        namespace: "dojo",
+        resources: [
+            TestResource::Model(m_Foo::TEST_CLASS_HASH),
+            TestResource::Contract(bar::TEST_CLASS_HASH),
+        ]
+            .span(),
+    };
+
+    let mut world = spawn_test_world([namespace_def].span());
+    world.sync_perms_and_inits([].span());
+
+    let (_, class_hash) = world.dns(@"bar").unwrap();
+    assert!(class_hash == bar::TEST_CLASS_HASH.try_into().unwrap());
+}

crates/dojo/core/src/world/storage.cairo

@@ -42,8 +42,12 @@ pub impl WorldStorageInternalImpl of WorldStorageTrait {
                 dojo::utils::selector_from_namespace_and_name(*self.namespace_hash, contract_name),
             ) {
             Resource::Contract((
-                contract_address, class_hash,
-            )) => Option::Some((contract_address, class_hash.try_into().unwrap())),
+                contract_address, _,
+            )) => {
+                let class_hash = starknet::syscalls::get_class_hash_at_syscall(contract_address)
+                    .expect('Failed to get class hash');
+                Option::Some((contract_address, class_hash))
+            },
             _ => Option::None,
         }
     }