~mvo/ubuntu-sso-client/strawman-lp711413

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# -*- coding: utf-8 -*-
#
# Copyright 2012 Canonical Ltd.
#
# This program is free software: you can redistribute it and/or modify it
# under the terms of the GNU General Public License version 3, as published
# by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranties of
# MERCHANTABILITY, SATISFACTORY QUALITY, or FITNESS FOR A PARTICULAR
# PURPOSE.  See the GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program.  If not, see <http://www.gnu.org/licenses/>.
#
# In addition, as a special exception, the copyright holders give
# permission to link the code of portions of this program with the
# OpenSSL library under certain conditions as described in each
# individual source file, and distribute linked combinations
# including the two.
# You must obey the GNU General Public License in all respects
# for all of the code used other than OpenSSL.  If you modify
# file(s) with this exception, you may extend this exception to your
# version of the file(s), but you are not obligated to do so.  If you
# do not wish to do so, delete this exception statement from your
# version.  If you delete this exception statement from all source
# files in the program, then also delete it here.
"""Linux specific tests for the main module."""

import time

from mock import patch

import dbus

from ubuntu_sso.tests import TestCase
from ubuntu_sso.main import UbuntuSSOProxy

# because we are using twisted we have java like names C0103
# pylint: disable=C0103


class UbuntuSSOProxyTestCase(TestCase):
    """Tests for the UbuntuSSOProxy """


    def test_retry_on_race_lp711413(self):
        """Test the retry on dbus failure feature to fix bug #711413 """
        def _simulate_dbus_unavailable_once():
            """ helper to simulate a dbus not-yet-ready error once """
            patcher.stop()
            raise dbus.DBusException()
        # simulate that the session bus is unavailable initially
        patcher = patch("dbus.SessionBus")
        session_bus_mock = patcher.start()
        session_bus_mock.side_effect = _simulate_dbus_unavailable_once
        # get proxy and measure the time to access the bus
        now = time.time()
        proxy = UbuntuSSOProxy(None)
        bus = proxy.bus
        delay = time.time() - now
        # verify that we have a bus and that it took the expected time
        self.assertNotEqual(bus, None)
        self.assertTrue(delay > 1*proxy.DBUS_RETRY_WAIT_TIME and
                        delay < 2*proxy.DBUS_RETRY_WAIT_TIME)

    
    @patch("time.sleep")
    @patch("dbus.SessionBus")
    def test_raise_on_timeout(self, mock_session_bus, mock_sleep):
        """Test that  the normal dbus.DBusException is raised on timeout """
        def _raise_dbus_exception():
            raise dbus.DBusException()
        mock_session_bus.side_effect = _raise_dbus_exception
        self.assertRaises(dbus.DBusException, UbuntuSSOProxy, None)