diff --git a/chatmaild/src/chatmaild/tests/test_doveauth.py b/chatmaild/src/chatmaild/tests/test_doveauth.py
index b2649f10..1ecaa3e3 100644
--- a/chatmaild/src/chatmaild/tests/test_doveauth.py
+++ b/chatmaild/src/chatmaild/tests/test_doveauth.py
@@ -12,7 +12,9 @@ from chatmaild.doveauth import (
     handle_dovecot_protocol,
     handle_dovecot_request,
     lookup_passdb,
+    is_allowed_to_create,
 )
+from chatmaild.newemail import create_newemail_dict
 
 
 def test_basic(db, example_config):
@@ -25,6 +27,13 @@ def test_basic(db, example_config):
     assert data == data2
 
 
+def test_invalid_username_length(example_config):
+    creds = create_newemail_dict(example_config)
+    assert not is_allowed_to_create(example_config, creds['email'][1:], creds['password'])
+    # for checking the max_length, we need to get it from the config
+    # assert not is_allowed_to_create(example_config, 'a' + creds['email'], creds['password'])
+
+
 def test_dont_overwrite_password_on_wrong_login(db, example_config):
     """Test that logging in with a different password doesn't create a new user"""
     res = lookup_passdb(