# -*- coding: utf-8 -*-
# ******************************************************************************
#
# Copyright (C) 2009 Olivier Tilloy <olivier@tilloy.net>
#
# This file is part of the pyexiv2 distribution.
#
# pyexiv2 is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# pyexiv2 is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY 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 pyexiv2; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, 5th Floor, Boston, MA 02110-1301 USA.
#
# Author: Olivier Tilloy <olivier@tilloy.net>
#
# ******************************************************************************
import unittest
from pyexiv2 import ListenerInterface, NotifyingList
import random
class SimpleListener(ListenerInterface):
# Total number of notifications
notifications = 0
# Last notification: (method_name, args)
last = None
def _notify(self, method_name, *args):
self.notifications += 1
self.last = (method_name, args)
def item_changed(self, index, item):
self._notify('item_changed', index, item)
def item_deleted(self, index):
self._notify('item_deleted', index)
def item_appended(self, item):
self._notify('item_appended', item)
def extended(self, items):
self._notify('extended', items)
def item_inserted(self, index, item):
self._notify('item_inserted', index, item)
class TestNotifyingList(unittest.TestCase):
def setUp(self):
self.values = NotifyingList([5, 7, 9, 14, 57, 3, 2])
def test_no_listener(self):
# No listener is registered, nothing should happen.
self.values[3] = 13
# TODO: test all operations (insertion, deletion, slicing, ...)
def test_listener_interface(self):
self.values.register_listener(ListenerInterface())
self.failUnlessRaises(NotImplementedError, self.values.__setitem__, 3, 13)
self.failUnlessRaises(NotImplementedError, self.values.__delitem__, 5)
self.failUnlessRaises(NotImplementedError, self.values.append, 17)
self.failUnlessRaises(NotImplementedError, self.values.extend, [11, 22])
self.failUnlessRaises(NotImplementedError, self.values.insert, 4, 24)
# TODO: test all operations (insertion, slicing, ...)
def test_one_listener(self):
listener = SimpleListener()
self.values.register_listener(listener)
self.values[3] = 13
self.failUnlessEqual(listener.notifications, 1)
self.failUnlessEqual(listener.last, ('item_changed', (3, 13)))
del self.values[5]
self.failUnlessEqual(listener.notifications, 2)
self.failUnlessEqual(listener.last, ('item_deleted', (5,)))
self.values.append(17)
self.failUnlessEqual(listener.notifications, 3)
self.failUnlessEqual(listener.last, ('item_appended', (17,)))
self.values.extend([11, 22])
self.failUnlessEqual(listener.notifications, 4)
self.failUnlessEqual(listener.last, ('extended', ([11, 22],)))
self.values.insert(4, 24)
self.failUnlessEqual(listener.notifications, 5)
self.failUnlessEqual(listener.last, ('item_inserted', (4, 24)))
# TODO: test all operations (slicing, ...)
def test_multiple_listeners(self):
# Register a random number of listeners
listeners = [SimpleListener() for i in xrange(random.randint(3, 20))]
for listener in listeners:
self.values.register_listener(listener)
self.values[3] = 13
for listener in listeners:
self.failUnlessEqual(listener.notifications, 1)
self.failUnlessEqual(listener.last, ('item_changed', (3, 13)))
del self.values[5]
for listener in listeners:
self.failUnlessEqual(listener.notifications, 2)
self.failUnlessEqual(listener.last, ('item_deleted', (5,)))
self.values.append(17)
for listener in listeners:
self.failUnlessEqual(listener.notifications, 3)
self.failUnlessEqual(listener.last, ('item_appended', (17,)))
self.values.extend([11, 22])
for listener in listeners:
self.failUnlessEqual(listener.notifications, 4)
self.failUnlessEqual(listener.last, ('extended', ([11, 22],)))
self.values.insert(4, 24)
for listener in listeners:
self.failUnlessEqual(listener.notifications, 5)
self.failUnlessEqual(listener.last, ('item_inserted', (4, 24)))
# TODO: test all operations (slicing, ...)
