diff --git a/tests/app/commands/test_get.py b/tests/app/commands/test_get.py
index bbd4fe18..06e3c5f4 100644
--- a/tests/app/commands/test_get.py
+++ b/tests/app/commands/test_get.py
@@ -2,6 +2,8 @@
 import json
 from unittest import mock
 
+import pytest
+
 from canaille.backends import ModelEncoder
 from canaille.commands import cli
 
@@ -15,6 +17,9 @@ def test_serialize(user):
         == '{"foo": "1970-01-01T00:00:00"}'
     )
 
+    with pytest.raises(TypeError):
+        json.dumps({"foo": object()}, cls=ModelEncoder)
+
 
 def test_get_list_models(testclient, backend, user):
     """Nominal case test for model get command."""
diff --git a/tests/core/test_profile_settings.py b/tests/core/test_profile_settings.py
index 673939af..f70f9758 100644
--- a/tests/core/test_profile_settings.py
+++ b/tests/core/test_profile_settings.py
@@ -35,7 +35,7 @@ def test_edition(testclient, logged_user, admin, foo_group, bar_group, backend):
     assert bar_group.members == [admin]
     assert "readonly" in res.form["groups"].attrs
     assert "readonly" in res.form["user_name"].attrs
-    
+
     res = testclient.get("/profile/user/settings", status=200)
     res.form["user_name"] = "user"
     res.form["password1"] = "i'm a little pea"