diff --git a/tests/test_ytils_utils.py b/tests/test_ytils_utils.py
index c10f1dcd3..826b9c5e2 100644
--- a/tests/test_ytils_utils.py
+++ b/tests/test_ytils_utils.py
@@ -30,14 +30,49 @@ def test_singleton_identity():
 
 # Test: typename()
 
-@pytest.mark.parametrize("obj,expected", [
+import pytest
+import types
+import math
+import sys
+
+# Une classe un peu plus complexe
+
+def sample_function(x):
+    def nested(y):
+        return y + x
+    return nested
+
+@pytest.mark.parametrize("obj, expected", [
+
+    (None, "NoneType"),
+    (True, "bool"),
     (42, "int"),
-    ("hello", "str"),
-    (test_singleton_class, "test_singleton_class"),
+    (3.14, "float"),
+    ("text", "str"),
+    ({1, 2, 3}, "set"),
+    ([[1], [2, 3]], "list"),
+    ([{"a": [1, 2]}, {"b": (3, 4)}], "list"),
+    ({"key": [{"nested": 1}, (2, 3)]}, "dict"),
+
+    # Fonctions 
+    (lambda x: x, "<lambda>"),
+    (sample_function, "sample_function"),
+    (sample_function(10), "nested"),  
+    (len, "len"),
+    (sum, "sum"),
+
+    # Modules 
+    (math, "math"),
+    (sys, "sys"),
+    (types.FunctionType, "FunctionType"),
+    ((i for i in range(3)), "generator"),
+    (iter([1, 2, 3]), "list_iterator"),
 ])
+
 def test_typename(obj, expected):
     assert typename(obj) == expected
 
+
 # Test: next_int()
 
 @pytest.mark.parametrize("nums,expected", [