def test_locked_delete(self):
service_name = 'my_unit_test'
user_name = 'me'
store = Storage(service_name, user_name)
with mock.patch.object(keyring, 'set_password',
return_value=None,
autospec=True) as set_password:
store.locked_delete()
set_password.assert_called_once_with(service_name, user_name, '')
