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# Authors:
# Jason Gerard DeRose <jderose@redhat.com>
#
# Copyright (C) 2008 Red Hat
# see file 'COPYING' for use and warranty information
#
# This program 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; version 2 only
#
# This program 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 this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
"""
Utility functions for the unit tests.
"""
class ExceptionNotRaised(Exception):
"""
Exception raised when an *expected* exception is *not* raised during a
unit test.
"""
msg = 'expected %s'
def __init__(self, expected):
self.expected = expected
def __str__(self):
return self.msg % self.expected.__name__
def yes_raises(exception, callback, *args, **kw):
"""
Tests that the expected exception is raised; raises ExceptionNotRaised
if test fails.
"""
raised = False
try:
callback(*args, **kw)
except exception:
raised = True
if not raised:
raise ExceptionNotRaised(exception)
def no_set(obj, name, value='some_new_obj'):
"""
Tests that attribute cannot be set.
"""
yes_raises(AttributeError, setattr, obj, name, value)
def no_del(obj, name):
"""
Tests that attribute cannot be deleted.
"""
yes_raises(AttributeError, delattr, obj, name)
def read_only(obj, name, value='some_new_obj'):
"""
Tests that attribute is read-only. Returns attribute.
"""
# Test that it cannot be set:
no_set(obj, name, value)
# Test that it cannot be deleted:
no_del(obj, name)
# Return the attribute
return getattr(obj, name)
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