diff --git a/async_tests/test_async_ldap_model.py b/async_tests/test_async_ldap_model.py
index 58e1f88..363c2ff 100644
--- a/async_tests/test_async_ldap_model.py
+++ b/async_tests/test_async_ldap_model.py
@@ -731,6 +731,20 @@ async def test_Service_create_not_existing(client_fixture):
     assert client_fixture.called_with_args["search"]["args"] == (s.dn, 0)
 
 
+@pytest.mark.asyncio
+async def test_Service_sync_existing(client_fixture):
+    s = Service("existing_service", client_fixture)
+
+    await s.sync()
+
+    assert client_fixture.called_with_args["search"]["args"] == (s.dn, 0)
+
+
+@pytest.mark.asyncio
+async def test_Service_sync_non_existing(client_fixture):
+    pass
+
+
 def test_Group(client_fixture):
     c = Group("amici_miei", client_fixture)