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# Copyright (C) 2010 Canonical Ltd
#
# 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; either version 2 of the License, or
# (at your option) any later version.
#
# 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
"""Fixtures that can be used within tests.
Fixtures can be created during a test as a way to separate out creation of
objects to test. Fixture objects can hold some state so that different
objects created during a test instance can be related. Normally a fixture
should live only for the duration of a single test, and its tearDown method
should be passed to `addCleanup` on the test.
"""
import itertools
def generate_unicode_names():
"""Generate a sequence of arbitrary unique unicode names.
By default they are not representable in ascii.
>>> gen = generate_unicode_names()
>>> n1 = gen.next()
>>> n2 = gen.next()
>>> type(n1)
<type 'unicode'>
>>> n1 == n2
False
>>> n1.encode('ascii', 'replace') == n1
False
"""
# include a mathematical symbol unlikely to be in 8-bit encodings
return (u"\N{SINE WAVE}%d" % x for x in itertools.count())
interesting_encodings = [
('iso-8859-1', False),
('ascii', False),
('cp850', False),
('utf-8', True),
('ucs-2', True),
]
def generate_unicode_encodings(universal_encoding=None):
"""Return a generator of unicode encoding names.
These can be passed to Python encode/decode/etc.
:param universal_encoding: True/False/None tristate to say whether the
generated encodings either can or cannot encode all unicode
strings.
>>> n1 = generate_unicode_names().next()
>>> enc = generate_unicode_encodings(universal_encoding=True).next()
>>> enc2 = generate_unicode_encodings(universal_encoding=False).next()
>>> n1.encode(enc).decode(enc) == n1
True
>>> try:
... n1.encode(enc2).decode(enc2)
... except UnicodeError:
... print 'fail'
fail
"""
# TODO: check they're supported on this platform?
if universal_encoding is not None:
e = [n for (n, u) in interesting_encodings if u == universal_encoding]
else:
e = [n for (n, u) in interesting_encodings]
return itertools.cycle(iter(e))
class RecordingContextManager(object):
"""A context manager that records."""
def __init__(self):
self._calls = []
def __enter__(self):
self._calls.append('__enter__')
return self # This is bound to the 'as' clause in a with statement.
def __exit__(self, exc_type, exc_val, exc_tb):
self._calls.append('__exit__')
return False # propogate exceptions.
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