diff --git a/tests/test_utils_pvpreload.py b/tests/test_utils_pvpreload.py
index e4ed218df..a5be4230a 100644
--- a/tests/test_utils_pvpreload.py
+++ b/tests/test_utils_pvpreload.py
@@ -178,6 +178,9 @@ def test_offload(tmp_path, caplog):
     pv_3.wait_for_connection(timeout=2)
     pv_4.wait_for_connection(timeout=2)
 
+    assert is_pv_in_cache(pvname_3)
+    assert is_pv_in_cache(pvname_4)
+
     # Patch le fichier et le delay
     with pytest.MonkeyPatch().context() as mp:
         mp.setattr("slic.utils.pvpreload.fn", fake_file)
@@ -186,11 +189,19 @@ def test_offload(tmp_path, caplog):
         with caplog.at_level("DEBUG"):
             offload()
 
-    # Vérifie que le fichier contient bien les bons noms
+    assert fake_file.exists(), "Offload file not created"
+    
+    # Lire le contenu du fichier
     with open(fake_file, "rb") as f:
-        names = std_pickle.load(f)    
-    assert pvname_3 in names
-    assert pvname_4 in names
+        try:
+            names = pickle.load(f)
+        except Exception as e:
+            pytest.fail(f"Failed to unpickle: {e}")
+    
+    # Vérifications finales
+    assert isinstance(names, set), "Saved data is not a set"
+    assert pvname_3 in names, f"PV3 missing in {names}"
+    assert pvname_4 in names, f"PV4 missing in {names}"
 
     # Vérifie les logs
     logs = "\n".join(caplog.messages)