archivemail/test_archivemail.py

#!/usr/bin/env python
############################################################################
# Copyright (C) 2002  Paul Rodger <paul@paulrodger.com>
#
# 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
############################################################################
# $Id$
"""
Unit-test archivemail using 'PyUnit'.

TODO: add tests for:
    * procmail locks already existing
    * messages with corrupted date headers
    * archiving maildir-format mailboxes
    * archiving MH-format mailboxes
    * appending to mbox archive files already existing 
    * add tests where we run archivemail via os.system()

"""

import sys

def check_python_version(): 
    """Abort if we are running on python < v2.0"""
    too_old_error = "This program requires python v2.0 or greater."
    try: 
        version = sys.version_info  # we might not even have this function! :)
        if (version[0] < 2):
            print too_old_error
            sys.exit(1)
    except AttributeError:
        print too_old_error
        sys.exit(1)

check_python_version()  # define & run this early because 'unittest' is new

import fcntl
import filecmp
import os
import shutil
import stat
import tempfile
import time
import unittest

try:
    import archivemail
except ImportError:
    print "The archivemail script needs to be called 'archivemail.py'"
    print "and should be in the current directory in order to be imported"
    print "and tested. Sorry."
    if os.path.isfile("archivemail"):
        print "Try renaming it from 'archivemail' to 'archivemail.py'."
    sys.exit(1)



############ Mbox Class testing ##############

class TestMboxIsEmpty(unittest.TestCase):
    def setUp(self):
        self.empty_name = make_mbox(messages=0)
        self.not_empty_name = make_mbox(messages=1)

    def testEmpty(self):
        """is_empty() should be true for an empty mbox"""
        mbox = archivemail.Mbox(self.empty_name)
        assert(mbox.is_empty())

    def testNotEmpty(self):
        """is_empty() should be false for a non-empty mbox"""
        mbox = archivemail.Mbox(self.not_empty_name)
        assert(not mbox.is_empty())

    def tearDown(self):
        for name in (self.empty_name, self.not_empty_name):
            if os.path.exists(name):
                os.remove(name)


class TestMboxLeaveEmpty(unittest.TestCase):
    def setUp(self):
        self.mbox_name = make_mbox()
        self.mbox_mode = os.stat(self.mbox_name)[stat.ST_MODE]
        self.mbox = archivemail.Mbox(self.mbox_name)

    def testLeaveEmpty(self):
        """leave_empty should leave a zero-length file"""
        self.mbox.leave_empty()
        assert(os.path.isfile(self.mbox_name))
        self.assertEqual(os.path.getsize(self.mbox_name), 0)
        new_mode = os.stat(self.mbox_name)[stat.ST_MODE]
        self.assertEqual(new_mode, self.mbox_mode)

    def tearDown(self):
        if os.path.exists(self.mbox_name):
            os.remove(self.mbox_name)


class TestMboxProcmailLock(unittest.TestCase):
    def setUp(self):
        self.mbox_name = make_mbox()
        self.mbox_mode = os.stat(self.mbox_name)[stat.ST_MODE]
        self.mbox = archivemail.Mbox(self.mbox_name)

    def testProcmailLock(self):
        """procmail_lock/unlock should create/delete a lockfile"""
        lock = self.mbox_name + ".lock"
        self.mbox.procmail_lock()
        assert(os.path.isfile(lock))
        assert(is_world_readable(lock))
        self.mbox.procmail_unlock()
        assert(not os.path.isfile(lock))

    def tearDown(self):
        if os.path.exists(self.mbox_name):
            os.remove(self.mbox_name)


class TestMboxRemove(unittest.TestCase):
    def setUp(self):
        self.mbox_name = make_mbox()
        self.mbox = archivemail.Mbox(self.mbox_name)

    def testMboxRemove(self):
        """remove() should delete a mbox mailbox"""
        assert(os.path.exists(self.mbox_name))
        self.mbox.remove()
        assert(not os.path.exists(self.mbox_name))

    def tearDown(self):
        if os.path.exists(self.mbox_name):
            os.remove(self.mbox_name)


class TestMboxExclusiveLock(unittest.TestCase):
    def setUp(self):
        self.mbox_name = make_mbox()
        self.mbox = archivemail.Mbox(self.mbox_name)

    def testExclusiveLock(self):
        """exclusive_lock/unlock should create/delete an advisory lock"""
        self.mbox.exclusive_lock()
        file = open(self.mbox_name, "r+")
        lock_nb = fcntl.LOCK_EX | fcntl.LOCK_NB
        self.assertRaises(IOError, fcntl.flock, file, lock_nb)

        self.mbox.exclusive_unlock()
        fcntl.flock(file, lock_nb)
        fcntl.flock(file, fcntl.LOCK_UN)

    def tearDown(self):
        if os.path.exists(self.mbox_name):
            os.remove(self.mbox_name)


class TestMboxNext(unittest.TestCase):
    def setUp(self):
        self.not_empty_name = make_mbox(messages=18)
        self.empty_name = make_mbox(messages=0)

    def testNextEmpty(self):
        """mbox.next() should return None on an empty mailbox"""
        mbox = archivemail.Mbox(self.empty_name)
        msg = mbox.next()
        self.assertEqual(msg, None)

    def testNextNotEmpty(self):
        """mbox.next() should a message on a populated mailbox"""
        mbox = archivemail.Mbox(self.not_empty_name)
        for count in range(18):
            msg = mbox.next()
            assert(msg)
        msg = mbox.next()
        self.assertEqual(msg, None)

    def tearDown(self):
        for name in (self.not_empty_name, self.empty_name):
            if os.path.exists(name):
                os.remove(name)


class TestMboxWrite(unittest.TestCase):
    def setUp(self):
        self.mbox_read = make_mbox(messages=3)
        self.mbox_write = make_mbox(messages=0)

    def testWrite(self):
        """mbox.write() should append messages to a mbox mailbox"""
        read = archivemail.Mbox(self.mbox_read)
        write = archivemail.Mbox(self.mbox_write, mode="w")
        for count in range(3):
            msg = read.next()
            write.write(msg)
        read.close()
        write.close()
        assert(filecmp.cmp(self.mbox_read, self.mbox_write, shallow=0))

    def testWriteNone(self):
        """calling mbox.write() with no message should raise AssertionError"""
        read = archivemail.Mbox(self.mbox_read)
        write = archivemail.Mbox(self.mbox_write, mode="w")
        self.assertRaises(AssertionError, write.write, None)

    def tearDown(self):
        for name in (self.mbox_write, self.mbox_read):
            if os.path.exists(name):
                os.remove(name)

########## options class testing #################

class TestOptionDefaults(unittest.TestCase):
    def testVerbose(self):
        """verbose should be off by default"""
        self.assertEqual(archivemail.options.verbose, 0)

    def testDaysOldMax(self):
        """default archival time should be 180 days"""
        self.assertEqual(archivemail.options.days_old_max, 180)

    def testQuiet(self):
        """quiet should be off by default"""
        self.assertEqual(archivemail.options.quiet, 0)

    def testDeleteOldMail(self):
        """we should not delete old mail by default"""
        self.assertEqual(archivemail.options.quiet, 0)

    def testNoCompress(self):
        """no-compression should be off by default"""
        self.assertEqual(archivemail.options.no_compress, 0)

########## archivemail.is_too_old() unit testing #################

class TestIsTooOld(unittest.TestCase):
    def testVeryOld(self):
        """is_too_old(max_days=360) should be true for these dates > 1 year"""
        for years in range(1, 10):
            time_msg = time.time() - (years * 365 * 24 * 60 * 60)
            assert(archivemail.is_too_old(time_message=time_msg, max_days=360))

    def testOld(self):
        """is_too_old(max_days=14) should be true for these dates > 14 days"""
        for days in range(14, 360):
            time_msg = time.time() - (days * 24 * 60 * 60)
            assert(archivemail.is_too_old(time_message=time_msg, max_days=14))

    def testJustOld(self):
        """is_too_old(max_days=1) should be true for these dates >= 1 day"""
        for minutes in range(0, 61):
            time_msg = time.time() - (25 * 60 * 60) + (minutes * 60)
            assert(archivemail.is_too_old(time_message=time_msg, max_days=1))

    def testNotOld(self):
        """is_too_old(max_days=9) should be false for these dates < 9 days"""
        for days in range(0, 9):
            time_msg = time.time() - (days * 24 * 60 * 60)
            assert(not archivemail.is_too_old(time_message=time_msg, max_days=9))

    def testJustNotOld(self):
        """is_too_old(max_days=1) should be false for these hours <= 1 day"""
        for minutes in range(0, 60):
            time_msg = time.time() - (23 * 60 * 60) - (minutes * 60)
            assert(not archivemail.is_too_old(time_message=time_msg, max_days=1))

    def testFuture(self):
        """is_too_old(max_days=1) should be false for times in the future"""
        for minutes in range(0, 60):
            time_msg = time.time() + (minutes * 60)
            assert(not archivemail.is_too_old(time_message=time_msg, max_days=1))

################ archivemail.choose_temp_dir() unit testing #############

class TestChooseTempDir(unittest.TestCase):
    def setUp(self):
        self.output_dir = tempfile.mktemp()
        os.mkdir(self.output_dir)
        self.sub_dir = tempfile.mktemp()
        os.mkdir(self.sub_dir)

    def testCurrentDir(self):
        """use the current directory as a temp directory with no output dir"""
        archivemail.options.output_dir = None
        dir = archivemail.choose_temp_dir("dummy")
        self.assertEqual(dir, os.curdir)

    def testSubDir(self):
        """use the mailbox parent directory as a temp directory"""
        archivemail.options.output_dir = None
        dir = archivemail.choose_temp_dir(os.path.join(self.sub_dir, "dummy"))
        self.assertEqual(dir, self.sub_dir)

    def testOutputDir(self):
        """use the output dir as a temp directory when specified"""
        archivemail.options.output_dir = self.output_dir
        dir = archivemail.choose_temp_dir("dummy")
        self.assertEqual(dir, self.output_dir)

    def testSubDirOutputDir(self):
        """use the output dir as temp when given a mailbox directory"""
        archivemail.options.output_dir = self.output_dir
        dir = archivemail.choose_temp_dir(os.path.join(self.sub_dir, "dummy"))
        self.assertEqual(dir, self.output_dir)

    def tearDown(self):
        os.rmdir(self.output_dir)
        os.rmdir(self.sub_dir)


########## acceptance testing ###########

class TestArchiveMboxTimestamp(unittest.TestCase):
    """original mbox timestamps should always be preserved"""
    def setUp(self):
        archivemail.options.quiet = 1

    def testNew(self):
        """mbox timestamps should not change after no archival"""
        self.mbox_name = make_mbox(messages=3, hours_old=(24 * 179))
        self.mtime = os.path.getmtime(self.mbox_name) - 66
        self.atime = os.path.getatime(self.mbox_name) - 88
        os.utime(self.mbox_name, (self.atime, self.mtime))
        archivemail.archive(self.mbox_name)
        assert(os.path.exists(self.mbox_name))
        new_atime = os.path.getatime(self.mbox_name)
        new_mtime = os.path.getmtime(self.mbox_name)
        self.assertEqual(self.mtime, new_mtime)
        self.assertEqual(self.atime, new_atime)

    def testMixed(self):
        """mbox timestamps should not change after semi-archival"""
        self.mbox_name = make_mbox(messages=3, hours_old=(24 * 181))
        self.mtime = os.path.getmtime(self.mbox_name) - 66
        self.atime = os.path.getatime(self.mbox_name) - 88
        os.utime(self.mbox_name, (self.atime, self.mtime))
        archive_name = self.mbox_name + "_archive.gz"
        archivemail.archive(self.mbox_name)
        assert(os.path.exists(self.mbox_name))
        new_atime = os.path.getatime(self.mbox_name)
        new_mtime = os.path.getmtime(self.mbox_name)
        self.assertEqual(self.mtime, new_mtime)
        self.assertEqual(self.atime, new_atime)

    def testOld(self):
        """mbox timestamps should not change after archival"""
        self.mbox_name = make_mbox(messages=3, hours_old=(24 * 181))
        self.mtime = os.path.getmtime(self.mbox_name) - 66
        self.atime = os.path.getatime(self.mbox_name) - 88
        os.utime(self.mbox_name, (self.atime, self.mtime))
        archive_name = self.mbox_name + "_archive.gz"
        archivemail.archive(self.mbox_name)
        assert(os.path.exists(self.mbox_name))
        new_atime = os.path.getatime(self.mbox_name)
        new_mtime = os.path.getmtime(self.mbox_name)
        self.assertEqual(self.mtime, new_mtime)
        self.assertEqual(self.atime, new_atime)

    def tearDown(self):
        archivemail.options.quiet = 0
        for name in (self.mbox_name, self.mbox_name + "_archive.gz"):
            if os.path.exists(name):
                os.remove(name)


class TestArchiveMbox(unittest.TestCase):
    """archiving should work based on the date of messages given"""
    old_mbox = None
    new_mbox = None
    mixed_mbox = None
    copy_name = None
    mbox_name = None

    def setUp(self):
        archivemail.options.quiet = 1

    def testOld(self):
        """archiving an old mailbox should create an exact archive"""
        self.mbox_name = make_mbox(messages=3, hours_old=(24 * 181))
        self.mbox_mode = os.stat(self.mbox_name)[stat.ST_MODE]
        self.copy_name = tempfile.mktemp()
        shutil.copyfile(self.mbox_name, self.copy_name)

        archivemail.archive(self.mbox_name)
        assert(os.path.exists(self.mbox_name))
        self.assertEqual(os.path.getsize(self.mbox_name), 0)
        new_mode = os.stat(self.mbox_name)[stat.ST_MODE]
        self.assertEqual(self.mbox_mode, new_mode)

        archive_name = self.mbox_name + "_archive.gz"
        assert(os.path.exists(archive_name))
        self.assertEqual(os.system("gzip -d %s" % archive_name), 0)

        archive_name = self.mbox_name + "_archive"
        assert(os.path.exists(archive_name))
        assert(filecmp.cmp(archive_name, self.copy_name, shallow=0))

    def testMixed(self):
        """archiving a mixed mailbox should make a mixed-archive"""
        self.new_mbox = make_mbox(messages=3, hours_old=(24 * 179))
        self.old_mbox = make_mbox(messages=3, hours_old=(24 * 181))
        self.mbox_name = tempfile.mktemp()
        shutil.copyfile(self.new_mbox, self.mbox_name)
        append_file(self.old_mbox, self.mbox_name)
        archivemail.archive(self.mbox_name)
        assert(os.path.exists(self.mbox_name))
        assert(filecmp.cmp(self.new_mbox, self.mbox_name, shallow=0))
        archive_name = self.mbox_name + "_archive.gz"
        assert(os.path.exists(archive_name))
        self.assertEqual(os.system("gzip -d %s" % archive_name), 0)
        archive_name = self.mbox_name + "_archive"
        assert(os.path.exists(archive_name))
        assert(filecmp.cmp(archive_name, self.old_mbox, shallow=0))

    def testNew(self):
        """archiving a new mailbox should not create an archive""" 
        self.mbox_name = make_mbox(messages=3, hours_old=(24 * 179))
        self.mbox_mode = os.stat(self.mbox_name)[stat.ST_MODE]
        self.copy_name = tempfile.mktemp()
        shutil.copyfile(self.mbox_name, self.copy_name)

        archivemail.archive(self.mbox_name)
        assert(os.path.exists(self.mbox_name))
        assert(filecmp.cmp(self.mbox_name, self.copy_name, shallow=0))
        new_mode = os.stat(self.mbox_name)[stat.ST_MODE]
        self.assertEqual(self.mbox_mode, new_mode)
        archive_name = self.mbox_name + "_archive.gz"
        assert(not os.path.exists(archive_name))

    def testOldExisting(self):
        """archiving an old mailbox with an existing archive"""
        self.mbox_name = make_mbox(messages=3, hours_old=(24 * 181))
        self.mbox_mode = os.stat(self.mbox_name)[stat.ST_MODE]
        self.copy_name = tempfile.mktemp()
        archive_name = self.mbox_name + "_archive"
        shutil.copyfile(self.mbox_name, self.copy_name) 
        shutil.copyfile(self.mbox_name, archive_name) # archive has 3 msgs
        append_file(self.mbox_name, self.copy_name) # copy now has 6 msgs
        self.assertEqual(os.system("gzip %s" % archive_name), 0)

        archivemail.archive(self.mbox_name)
        assert(os.path.exists(self.mbox_name))
        self.assertEqual(os.path.getsize(self.mbox_name), 0)
        new_mode = os.stat(self.mbox_name)[stat.ST_MODE]
        self.assertEqual(self.mbox_mode, new_mode)
        archive_name = self.mbox_name + "_archive.gz"
        assert(os.path.exists(archive_name))
        self.assertEqual(os.system("gzip -d %s" % archive_name), 0)
        archive_name = self.mbox_name + "_archive"
        assert(os.path.exists(archive_name))
        assert(filecmp.cmp(archive_name, self.copy_name, shallow=0))

    def tearDown(self):
        archivemail.options.quiet = 0
        archive = self.mbox_name + "_archive"
        for name in (self.mbox_name, self.old_mbox, self.new_mbox, 
            self.copy_name, archive, archive + ".gz"):
            if name and os.path.exists(name):
                os.remove(name)


class TestArchiveMboxPreserveStatus(unittest.TestCase):
    """make sure the 'preserve_unread' option works"""
    def setUp(self):
        archivemail.options.quiet = 1
        archivemail.options.preserve_unread = 1

    def testOldRead(self):
        """archiving an old read mailbox should create an archive"""
        self.mbox_name = make_mbox(messages=3, hours_old=(24 * 181), \
            status="RO")
        self.copy_name = tempfile.mktemp()
        shutil.copyfile(self.mbox_name, self.copy_name)

        archivemail.archive(self.mbox_name)
        assert(os.path.exists(self.mbox_name))
        self.assertEqual(os.path.getsize(self.mbox_name), 0)
        archive_name = self.mbox_name + "_archive.gz"
        assert(os.path.exists(archive_name))
        self.assertEqual(os.system("gzip -d %s" % archive_name), 0)
        archive_name = self.mbox_name + "_archive"
        assert(os.path.exists(archive_name))
        assert(filecmp.cmp(archive_name, self.copy_name, shallow=0))

    def testOldUnread(self):
        """archiving an unread mailbox should not create an archive"""
        self.mbox_name = make_mbox(messages=3, hours_old=(24 * 181))
        self.copy_name = tempfile.mktemp()
        shutil.copyfile(self.mbox_name, self.copy_name)

        archivemail.archive(self.mbox_name)
        assert(os.path.exists(self.mbox_name))
        assert(filecmp.cmp(self.mbox_name, self.copy_name, shallow=0))
        archive_name = self.mbox_name + "_archive.gz"
        assert(not os.path.exists(archive_name))

    def tearDown(self):
        archivemail.options.quiet = 0
        archivemail.options.preserve_unread = 0
        archive = self.mbox_name + "_archive"
        for name in (self.mbox_name, self.copy_name, archive, archive + ".gz"):
            if os.path.exists(name):
                os.remove(name)


class TestArchiveMboxUncompressedOld(unittest.TestCase):
    """make sure that the 'no_compress' option works"""
    mbox_name = None
    new_mbox = None
    old_mbox = None
    copy_name = None

    def setUp(self):
        archivemail.options.quiet = 1
        archivemail.options.no_compress = 1

    def testOld(self):
        """archiving an old mailbox uncompressed should create an ok archive"""
        self.mbox_name = make_mbox(messages=3, hours_old=(24 * 181))
        self.mbox_mode = os.stat(self.mbox_name)[stat.ST_MODE]
        self.copy_name = tempfile.mktemp()
        shutil.copyfile(self.mbox_name, self.copy_name)
        archivemail.archive(self.mbox_name)
        assert(os.path.exists(self.mbox_name))
        self.assertEqual(os.path.getsize(self.mbox_name), 0)
        new_mode = os.stat(self.mbox_name)[stat.ST_MODE]
        self.assertEqual(self.mbox_mode, new_mode)
        archive_name = self.mbox_name + "_archive"
        assert(os.path.exists(archive_name))
        assert(filecmp.cmp(archive_name, self.copy_name, shallow=0))
        assert(not os.path.exists(archive_name + ".gz"))

    def testNew(self):
        """archiving a new mailbox uncompressed should not create an archive"""
        self.mbox_name = make_mbox(messages=3, hours_old=(24 * 179))
        self.mbox_mode = os.stat(self.mbox_name)[stat.ST_MODE]
        self.copy_name = tempfile.mktemp()
        shutil.copyfile(self.mbox_name, self.copy_name)
        archivemail.archive(self.mbox_name)
        assert(os.path.exists(self.mbox_name))
        assert(filecmp.cmp(self.mbox_name, self.copy_name, shallow=0))
        new_mode = os.stat(self.mbox_name)[stat.ST_MODE]
        self.assertEqual(self.mbox_mode, new_mode)
        archive_name = self.mbox_name + "_archive"
        assert(not os.path.exists(archive_name))
        assert(not os.path.exists(archive_name + ".gz"))

    def testMixed(self):
        """archiving a mixed mailbox uncompressed should create a mixed archive"""
        self.new_mbox = make_mbox(messages=3, hours_old=(24 * 179))
        self.old_mbox = make_mbox(messages=3, hours_old=(24 * 181))
        self.mbox_name = tempfile.mktemp()
        shutil.copyfile(self.new_mbox, self.mbox_name)
        append_file(self.old_mbox, self.mbox_name)
        archivemail.archive(self.mbox_name)
        assert(os.path.exists(self.mbox_name))
        assert(filecmp.cmp(self.new_mbox, self.mbox_name, shallow=0))
        archive_name = self.mbox_name + "_archive"
        assert(os.path.exists(archive_name))
        assert(filecmp.cmp(archive_name, self.old_mbox, shallow=0))
        assert(not os.path.exists(archive_name + ".gz"))

    def testOldExists(self):
        """archiving an old mailbox without compressing with an existing archive"""
        self.mbox_name = make_mbox(messages=3, hours_old=(24 * 181))
        self.mbox_mode = os.stat(self.mbox_name)[stat.ST_MODE]
        self.copy_name = tempfile.mktemp()
        archive_name = self.mbox_name + "_archive"
        shutil.copyfile(self.mbox_name, self.copy_name) 
        shutil.copyfile(self.mbox_name, archive_name) # archive has 3 msgs
        append_file(self.mbox_name, self.copy_name) # copy now has 6 msgs
        archivemail.archive(self.mbox_name)
        assert(os.path.exists(self.mbox_name))
        self.assertEqual(os.path.getsize(self.mbox_name), 0)
        new_mode = os.stat(self.mbox_name)[stat.ST_MODE]
        self.assertEqual(self.mbox_mode, new_mode)
        archive_name = self.mbox_name + "_archive"
        assert(os.path.exists(archive_name))
        assert(filecmp.cmp(archive_name, self.copy_name, shallow=0))
        assert(not os.path.exists(archive_name + ".gz"))

    def tearDown(self):
        archivemail.options.quiet = 0
        archivemail.options.no_compress = 0
        archive = self.mbox_name + "_archive"
        for name in (self.mbox_name, self.new_mbox, self.old_mbox, 
            self.copy_name, archive, archive + ".gz"):
            if name and os.path.exists(name):
                os.remove(name)


class TestArchiveMboxMode(unittest.TestCase):
    """file mode (permissions) of the original mbox should be preserved"""
    def setUp(self):
        archivemail.options.quiet = 1

    def testOld(self):
        """after archiving, the original mbox mode should be preserved"""
        for mode in (0666, 0664, 0660, 0640, 0600):
            self.mbox_name = make_mbox(messages=1, hours_old=(24 * 181))
            os.chmod(self.mbox_name, mode)
            archivemail.archive(self.mbox_name)
            archive_name = self.mbox_name + "_archive.gz"
            assert(os.path.exists(self.mbox_name))
            assert(os.path.exists(archive_name))
            new_mode = os.stat(self.mbox_name)[stat.ST_MODE]
            self.assertEqual(mode, stat.S_IMODE(new_mode))
            archive_mode = os.stat(archive_name)[stat.ST_MODE]
            self.assertEqual(0600, stat.S_IMODE(archive_mode))
            os.remove(archive_name)
            os.remove(self.mbox_name)

    # TODO: write a mixed case

    def testNew(self):
        """after no archiving, the original mbox mode should be preserved"""
        for mode in (0666, 0664, 0660, 0640, 0600):
            self.mbox_name = make_mbox(messages=1, hours_old=(24 * 179))
            os.chmod(self.mbox_name, mode)
            archivemail.archive(self.mbox_name)
            archive_name = self.mbox_name + "_archive.gz"
            assert(not os.path.exists(archive_name))
            assert(os.path.exists(self.mbox_name))
            new_mode = os.stat(self.mbox_name)[stat.ST_MODE]
            self.assertEqual(mode, stat.S_IMODE(new_mode))
            os.remove(self.mbox_name)

    def tearDown(self):
        archivemail.options.quiet = 0
        if os.path.exists(self.mbox_name):
            os.remove(self.mbox_name)


########## helper routines ############

def make_message(hours_old=0, status=None):
    time_message = time.time() - (60 * 60 * hours_old)
    time_string = time.asctime(time.localtime(time_message))

    msg = """From sender@domain %s
From: sender@domain
To: receipient@domain
Subject: This is a dummy message
Date: %s
""" % (time_string, time_string)
    
    if status:
        msg = msg + ("Status: %s\n" % status)

    msg = msg + """

This is the message body.
It's very exciting.


""" 
    return msg


def append_file(source, dest):
    """appends the file named 'source' to the file named 'dest'"""
    assert(os.path.isfile(source))
    assert(os.path.isfile(dest))
    read = open(source, "r")
    write = open(dest, "a+")
    write.writelines(read.readlines())
    read.close()
    write.close()

def make_mbox(messages=1, hours_old=0, status=None):
    name = tempfile.mktemp()
    file = open(name, "w")
    for count in range(messages):
        file.write(make_message(hours_old=hours_old, status=status))
    file.close()
    return name
    
def is_world_readable(path):
    """Return true if the path is world-readable, false otherwise"""
    assert(path)
    return (os.stat(path)[stat.ST_MODE] & stat.S_IROTH)

if __name__ == "__main__":
    unittest.main()