diff --git a/tests/test_models.py b/tests/test_models.py
index 3b80ec8..6a492c0 100644
--- a/tests/test_models.py
+++ b/tests/test_models.py
@@ -65,7 +65,7 @@ def test_user_model(self):
         default_user = User(**user_kwargs)
         self.assertIsInstance(default_user.tokens[0], TokenConfig)
         with self.assertRaises(ValidationError):
-            User(username="test")
+            User()
 
         with self.assertRaises(ValidationError):
             User(username="test", password_hash="test",
diff --git a/tests/test_service.py b/tests/test_service.py
index 45c01b7..0b77369 100644
--- a/tests/test_service.py
+++ b/tests/test_service.py
@@ -5,7 +5,8 @@
 
 from neon_users_service.databases import UserDatabase
 from neon_users_service.databases.sqlite import SQLiteUserDatabase
-from neon_users_service.exceptions import ConfigurationError, AuthenticationError, UserNotFoundError
+from neon_users_service.exceptions import ConfigurationError, AuthenticationError, UserNotFoundError, \
+    UserNotMatchedError
 from neon_users_service.models import User
 from neon_users_service.service import NeonUsersService
 
@@ -131,13 +132,13 @@ def test_delete_user(self):
         with self.assertRaises(UserNotFoundError):
             service.delete_user(invalid_user)
 
-        with self.assertRaises(UserNotFoundError):
+        with self.assertRaises(UserNotMatchedError):
             service.delete_user(incomplete_user)
 
         deleted = service.delete_user(user_1)
         self.assertEqual(deleted, user_1)
 
-        with self.assertRaises(UserNotFoundError):
+        with self.assertRaises(UserNotMatchedError):
             service.read_unauthenticated_user(user_1.user_id)
 
         service.shutdown()