test: applying Gemini's suggestions

Author: didier-durand

tests/auth/test_user.py

@@ -7,12 +7,12 @@
 
 class TestUser(unittest.TestCase):
     def test_is_abstract(self):
-        assert isabstract(User)
+        self.assertTrue(isabstract(User))
 
 
 class TestUnauthenticatedUser(unittest.TestCase):
     def test_is_user_subclass(self):
-        assert issubclass(UnauthenticatedUser, User)
+        self.assertTrue(issubclass(UnauthenticatedUser, User))
 
     def test_is_authenticated_returns_false(self):
         user = UnauthenticatedUser()