diff --git a/tests/test_utils_snapshot.py b/tests/test_utils_snapshot.py
index 86d7c7a1c..460b7449b 100644
--- a/tests/test_utils_snapshot.py
+++ b/tests/test_utils_snapshot.py
@@ -1,15 +1,13 @@
 import pytest
-from slic.utils.snapshot import snapshot 
-from slic.utils import registry
-from slic.core.adjustable import Adjustable
 from unittest.mock import patch
+from slic.utils.registry import instances
+from slic.utils.snapshot import snapshot
+from slic.core.adjustable import Adjustable
 
-
-# --- Fake Adjustable class for testing ---
 class FakeAdjustable(Adjustable):
     def __init__(self, ID, name=None, internal=False):
         super().__init__(ID=ID, name=name or ID, internal=internal)
-        self._value = 0  # dummy fixed value for all instances
+        self._value = 0
 
     def get_current_value(self):
         return self._value
@@ -26,58 +24,52 @@ class FakeAdjustable(Adjustable):
     def set_target_value(self, value, *args, **kwargs):
         return value
 
+@pytest.fixture(autouse=True)
+def clean_registry():
+    instances.cache_clear()
 
 def test_snapshot_excludes_internal_by_default():
-
-    visible = FakeAdjustable("visible", internal=False)
-    hidden = FakeAdjustable("internal", internal=True)
+    visible = FakeAdjustable("vis_id", "visible", False)
+    hidden = FakeAdjustable("hid_id", "internal", True)
 
     with patch('slic.utils.registry.instances', return_value=[visible, hidden]):
         result = snapshot()
+        assert len(result) == 1
         assert visible in result
         assert hidden not in result
 
-
 def test_snapshot_include_internal_flag():
-    visible = FakeAdjustable("visible", internal=False)
-    hidden = FakeAdjustable("internal", internal=True)
+    visible = FakeAdjustable("vis_id", "visible", False)
+    hidden = FakeAdjustable("hid_id", "internal", True)
 
     with patch('slic.utils.registry.instances', return_value=[visible, hidden]):
         result = snapshot(include_internal=True)
+        assert len(result) == 2
         assert visible in result
         assert hidden in result
-        assert len(result) == 2
-
 
 def test_snapshot_empty_result():
     with patch('slic.utils.registry.instances', return_value=[]):
         result = snapshot()
-        assert isinstance(result, list)
         assert result == []
 
-# Sort key tests
-
-@pytest.mark.parametrize("sort_key, expected_order", [
-    (repr, ["Alpha", "Beta", "Charlie"]),  # Modifié pour utiliser les vrais noms
+@pytest.mark.parametrize("sort_key,expected", [
+    (repr, ["Alpha", "Beta", "Charlie"]),
     (str, ["Alpha", "Beta", "Charlie"]),
     (lambda a: a.ID, ["id1", "id2", "id3"]),
-    (lambda a: a.name.lower(), ["Alpha", "Beta", "Charlie"]),
+    (lambda a: a.name.lower(), ["alpha", "beta", "charlie"]),
 ])
-def test_snapshot_sort_keys(sort_key, expected_order):
-    a = FakeAdjustable("id3", name="Alpha")
-    b = FakeAdjustable("id1", name="Beta") 
-    c = FakeAdjustable("id2", name="Charlie")
-
-    unordered = [c, a, b]
-
-    with patch('slic.utils.registry.instances', return_value=unordered):
+def test_snapshot_sort_keys(sort_key, expected):
+    a = FakeAdjustable("id3", "Alpha")
+    b = FakeAdjustable("id1", "Beta")
+    c = FakeAdjustable("id2", "Charlie")
+    
+    with patch('slic.utils.registry.instances', return_value=[c, a, b]):
         result = snapshot(sort_key=sort_key)
         
-        if sort_key == repr:
-            assert [obj.name for obj in result] == expected_order
-        elif sort_key == str:
-            assert [obj.name for obj in result] == expected_order
-        elif 'ID' in sort_key.__code__.co_varnames:
-            assert [obj.ID for obj in result] == expected_order
+        if callable(sort_key) and 'ID' in sort_key.__code__.co_varnames:
+            assert [x.ID for x in result] == expected
+        elif callable(sort_key):
+            assert [x.name.lower() for x in result] == expected
         else:
-            assert [obj.name.lower() for obj in result] == [n.lower() for n in expected_order]
\ No newline at end of file
+            assert [x.name for x in result] == expected
\ No newline at end of file