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Viewing changes to bzrlib/tests/test_tuned_gzip.py

  • Committer: Patch Queue Manager
  • Date: 2016-04-21 05:06:57 UTC
  • mfrom: (6603.4.1 bzr)
  • Revision ID: pqm@pqm.ubuntu.com-20160421050657-ygnzfybewvudf1j9
(richard-wilbur) Use initial_comment as commit_message for lp_propose.(Shawn
 Wang) (Shawn Wang)

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bzrlib/tests/test_tuned_gzip.py
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# Copyright (C) 2006 Canonical Ltd
 
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# Copyright (C) 2006, 2009, 2010, 2011 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 tuned_gzip
 
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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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class FakeDecompress(object):
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        return ''
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class TestFakeDecompress(TestCase):
 
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class TestFakeDecompress(tests.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(TestCase):
 
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class TestGzip(tests.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 = tuned_gzip.GzipFile(fileobj=stream)
 
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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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        # 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.failUnless(myfile._new_member)
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class TestToGzip(TestCase):
 
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        self.assertTrue(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.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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    def assertToGzip(self, chunks):
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        bytes = ''.join(chunks)
 
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        raw_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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        gzfrombytes = tuned_gzip.bytes_to_gzip(raw_bytes)
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        self.assertEqual(gzfrombytes, gzfromchunks)
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        decoded = tuned_gzip.GzipFile(fileobj=StringIO(gzfromchunks)).read()
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        self.assertEqual(bytes, decoded)
 
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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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        lraw, ldecoded = len(raw_bytes), len(decoded)
 
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        self.assertEqual(lraw, ldecoded,
 
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                         'Expecting data length %d, got %d' % (lraw, ldecoded))
 
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        self.assertEqual(raw_bytes, decoded)
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    def test_single_chunk(self):
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        self.assertToGzip(['a modest chunk\nwith some various\nbits\n'])