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Viewing changes to bzrlib/tests/test_tuned_gzip.py

  • Committer: Andrew Bennetts
  • Date: 2010-10-13 00:26:41 UTC
  • mto: This revision was merged to the branch mainline in revision 5498.
  • Revision ID: andrew.bennetts@canonical.com-20101013002641-9tlh9k89mlj1666m
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bzrlib/tests/test_tuned_gzip.py
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# Copyright (C) 2006, 2009, 2010, 2011 Canonical Ltd
 
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# Copyright (C) 2006, 2009, 2010 Canonical Ltd
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# do not use bzrlib test cases here - this should be suitable for sending
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# upstream.
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from cStringIO import StringIO
 
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from unittest import TestCase
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import zlib
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from bzrlib import (
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    symbol_versioning,
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    tuned_gzip,
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    tests,
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    )
 
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from bzrlib import tuned_gzip
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class FakeDecompress(object):
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        return ''
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class TestFakeDecompress(tests.TestCase):
 
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class TestFakeDecompress(TestCase):
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    """We use a fake decompressor to test GzipFile.
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    This class tests the behaviours we want from it.
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        self.assertEqual('1234567', decompress.unused_data)
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class TestGzip(tests.TestCase):
 
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class TestGzip(TestCase):
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    def test__read_short_remainder(self):
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        # a _read call at the end of a compressed hunk should
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        # read more bytes if there is less than 8 bytes (the
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        # gzip trailer) unread.
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        stream = StringIO('\0\0\0\0\0\0\0\0')
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        myfile = self.applyDeprecated(
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            symbol_versioning.deprecated_in((2, 3, 0)),
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            tuned_gzip.GzipFile, fileobj=stream)
 
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        myfile = tuned_gzip.GzipFile(fileobj=stream)
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        # disable the _new_member check, we are microtesting.
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        myfile._new_member = False
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        myfile.crc = zlib.crc32('')
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        # all the data should have been read now
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        self.assertEqual('', stream.read())
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        # and it should be new member time in the stream.
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        self.assertTrue(myfile._new_member)
 
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        self.failUnless(myfile._new_member)
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    def test_negative_crc(self):
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        """Content with a negative crc should not break when written"""
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        sio = StringIO()
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        gfile = self.applyDeprecated(
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            symbol_versioning.deprecated_in((2, 3, 0)),
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            tuned_gzip.GzipFile, mode="w", fileobj=sio)
 
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        gfile = tuned_gzip.GzipFile(mode="w", fileobj=sio)
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        gfile.write("\xFF")
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        gfile.close()
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        self.assertEqual(gfile.crc & 0xFFFFFFFFL, 0xFF000000L)
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        self.assertEqual(sio.getvalue()[-8:-4], "\x00\x00\x00\xFF")
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class TestToGzip(tests.TestCase):
 
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class TestToGzip(TestCase):
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    def assertToGzip(self, chunks):
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        bytes = ''.join(chunks)
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        gzfromchunks = tuned_gzip.chunks_to_gzip(chunks)
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        gzfrombytes = tuned_gzip.bytes_to_gzip(bytes)
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        self.assertEqual(gzfrombytes, gzfromchunks)
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        decoded = self.applyDeprecated(
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            symbol_versioning.deprecated_in((2, 3, 0)),
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            tuned_gzip.GzipFile, fileobj=StringIO(gzfromchunks)).read()
 
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        decoded = tuned_gzip.GzipFile(fileobj=StringIO(gzfromchunks)).read()
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        self.assertEqual(bytes, decoded)
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    def test_single_chunk(self):