diff --git a/tests/test_utils_ipy.py b/tests/test_utils_ipy.py
index 1057b4722..c72dfa690 100644
--- a/tests/test_utils_ipy.py
+++ b/tests/test_utils_ipy.py
@@ -5,15 +5,19 @@ from slic.core.device.device import Device
 import types
 
 
-@pytest.fixture(scope="module", autouse=True)
-def simulate_ipython(monkeypatch):
+@pytest.fixture(scope="module")
+def fake_ipython():
+    """Fixture module-scoped pour simuler IPython"""
     class FakeIPython:
         def __init__(self):
             self.user_ns = {}
+    return FakeIPython()
 
-    fake_ipy = FakeIPython()
-    monkeypatch.setattr("slic.utils.ipy.get_ipython", lambda: fake_ipy)
-    return fake_ipy
+@pytest.fixture(autouse=True)
+def simulate_ipython(fake_ipython, monkeypatch):
+    """Configure le mock IPython avant chaque test"""
+    monkeypatch.setattr("slic.utils.ipy.get_ipython", lambda: fake_ipython)
+    return fake_ipython
 
 def test_devices_repr_fallback_and_ignore(simulate_ipython):
     ipy = simulate_ipython
@@ -30,7 +34,7 @@ def test_devices_repr_fallback_and_ignore(simulate_ipython):
             super().__init__(ID)
             self.ID = ID
             self.description = "desc ok"
-            self.name = None  # Explicit None
+            self.name = None
 
     class WithDoc(Device):
         """doc ok"""
@@ -69,7 +73,7 @@ def test_devices_repr_fallback_and_ignore(simulate_ipython):
 
     out = repr(devices)
 
-    # Core assertions (unchanged)
+    # Core assertions
     assert "test_desc" in out
     assert "desc ok" in out
     assert "test_doc" in out
@@ -81,7 +85,7 @@ def test_devices_repr_fallback_and_ignore(simulate_ipython):
     assert "test_str" not in out
     assert "_hidden" not in out
 
-    # New None checks (what you asked for)
+    # None checks
     assert getattr(ipy.user_ns["test_desc"], "name") is None
     assert getattr(ipy.user_ns["test_doc"], "name") is None
     assert getattr(ipy.user_ns["test_doc"], "description") is None