tests/test-simplemerge.py
author Boris Feld <boris.feld@octobus.net>
Wed, 19 Sep 2018 21:02:47 +0200
changeset 39886 debc4ee597e7
parent 38645 02850baddadd
child 43010 d75142ef054a
permissions -rw-r--r--
revlog: add a callback "tracking" duplicate node addition If a changegroup contains node already added to the repository, they will be skipped. Skipping them is the right behavior (we don't need to store things twice), but it can hide some information to the code doing the unbundle (eg: shelve looking for the tip of the bundle). The first step to improve this situation is to add a low level callback. We do not need this tracking on all revlog, so actual tracking will be added in the next changeset.
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# Copyright (C) 2004, 2005 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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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, see <http://www.gnu.org/licenses/>.
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from __future__ import absolute_import
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import unittest
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from mercurial import (
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    error,
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    simplemerge,
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    util,
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)
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from mercurial.utils import (
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    stringutil,
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)
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TestCase = unittest.TestCase
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# bzr compatible interface, for the tests
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class Merge3(simplemerge.Merge3Text):
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    """3-way merge of texts.
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    Given BASE, OTHER, THIS, tries to produce a combined text
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    incorporating the changes from both BASE->OTHER and BASE->THIS.
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    All three will typically be sequences of lines."""
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    def __init__(self, base, a, b):
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        basetext = b'\n'.join([i.strip(b'\n') for i in base] + [b''])
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        atext = b'\n'.join([i.strip(b'\n') for i in a] + [b''])
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        btext = b'\n'.join([i.strip(b'\n') for i in b] + [b''])
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        if (stringutil.binary(basetext) or stringutil.binary(atext)
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            or stringutil.binary(btext)):
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            raise error.Abort(b"don't know how to merge binary files")
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        simplemerge.Merge3Text.__init__(self, basetext, atext, btext,
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                                        base, a, b)
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CantReprocessAndShowBase = simplemerge.CantReprocessAndShowBase
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def split_lines(t):
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    return util.stringio(t).readlines()
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############################################################
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# test case data from the gnu diffutils manual
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# common base
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TZU = split_lines(b"""     The Nameless is the origin of Heaven and Earth;
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     The named is the mother of all things.
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     Therefore let there always be non-being,
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       so we may see their subtlety,
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     And let there always be being,
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       so we may see their outcome.
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     The two are the same,
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     But after they are produced,
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       they have different names.
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     They both may be called deep and profound.
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     Deeper and more profound,
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     The door of all subtleties!
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""")
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LAO = split_lines(b"""     The Way that can be told of is not the eternal Way;
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     The name that can be named is not the eternal name.
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     The Nameless is the origin of Heaven and Earth;
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     The Named is the mother of all things.
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     Therefore let there always be non-being,
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       so we may see their subtlety,
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     And let there always be being,
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       so we may see their outcome.
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     The two are the same,
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     But after they are produced,
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       they have different names.
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""")
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TAO = split_lines(b"""     The Way that can be told of is not the eternal Way;
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     The name that can be named is not the eternal name.
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     The Nameless is the origin of Heaven and Earth;
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     The named is the mother of all things.
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     Therefore let there always be non-being,
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       so we may see their subtlety,
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     And let there always be being,
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       so we may see their result.
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     The two are the same,
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     But after they are produced,
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       they have different names.
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       -- The Way of Lao-Tzu, tr. Wing-tsit Chan
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""")
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MERGED_RESULT = split_lines(b"""\
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     The Way that can be told of is not the eternal Way;
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     The name that can be named is not the eternal name.
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     The Nameless is the origin of Heaven and Earth;
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     The Named is the mother of all things.
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     Therefore let there always be non-being,
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       so we may see their subtlety,
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     And let there always be being,
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       so we may see their result.
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     The two are the same,
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     But after they are produced,
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       they have different names.\
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\n<<<<<<< LAO\
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\n=======
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       -- The Way of Lao-Tzu, tr. Wing-tsit Chan
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\
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\n>>>>>>> TAO
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""")
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class TestMerge3(TestCase):
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    def log(self, msg):
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        pass
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    def test_no_changes(self):
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        """No conflicts because nothing changed"""
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        m3 = Merge3([b'aaa', b'bbb'],
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                    [b'aaa', b'bbb'],
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                    [b'aaa', b'bbb'])
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        self.assertEqual(m3.find_unconflicted(),
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                         [(0, 2)])
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        self.assertEqual(list(m3.find_sync_regions()),
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                         [(0, 2,
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                           0, 2,
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                           0, 2),
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                          (2, 2,  2, 2,  2, 2)])
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        self.assertEqual(list(m3.merge_regions()),
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                         [(b'unchanged', 0, 2)])
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        self.assertEqual(list(m3.merge_groups()),
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                         [(b'unchanged', [b'aaa', b'bbb'])])
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    def test_front_insert(self):
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        m3 = Merge3([b'zz'],
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                    [b'aaa', b'bbb', b'zz'],
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                    [b'zz'])
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        # todo: should use a sentinel at end as from get_matching_blocks
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        # to match without zz
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        self.assertEqual(list(m3.find_sync_regions()),
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                         [(0, 1,  2, 3,  0, 1),
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                          (1, 1,  3, 3,  1, 1)])
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        self.assertEqual(list(m3.merge_regions()),
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                         [(b'a', 0, 2),
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                          (b'unchanged', 0, 1)])
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        self.assertEqual(list(m3.merge_groups()),
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                         [(b'a', [b'aaa', b'bbb']),
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                          (b'unchanged', [b'zz'])])
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    def test_null_insert(self):
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        m3 = Merge3([],
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                    [b'aaa', b'bbb'],
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                    [])
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        # todo: should use a sentinel at end as from get_matching_blocks
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        # to match without zz
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        self.assertEqual(list(m3.find_sync_regions()),
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                         [(0, 0,  2, 2,  0, 0)])
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        self.assertEqual(list(m3.merge_regions()),
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                         [(b'a', 0, 2)])
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        self.assertEqual(list(m3.merge_lines()),
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                         [b'aaa', b'bbb'])
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    def test_no_conflicts(self):
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        """No conflicts because only one side changed"""
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        m3 = Merge3([b'aaa', b'bbb'],
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                    [b'aaa', b'111', b'bbb'],
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                    [b'aaa', b'bbb'])
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        self.assertEqual(m3.find_unconflicted(),
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                         [(0, 1), (1, 2)])
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        self.assertEqual(list(m3.find_sync_regions()),
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                         [(0, 1,  0, 1,  0, 1),
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                          (1, 2,  2, 3,  1, 2),
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                          (2, 2,  3, 3,  2, 2)])
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        self.assertEqual(list(m3.merge_regions()),
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                         [(b'unchanged', 0, 1),
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                          (b'a', 1, 2),
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                          (b'unchanged', 1, 2)])
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    def test_append_a(self):
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        m3 = Merge3([b'aaa\n', b'bbb\n'],
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                    [b'aaa\n', b'bbb\n', b'222\n'],
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                    [b'aaa\n', b'bbb\n'])
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        self.assertEqual(b''.join(m3.merge_lines()),
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                         b'aaa\nbbb\n222\n')
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    def test_append_b(self):
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        m3 = Merge3([b'aaa\n', b'bbb\n'],
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                    [b'aaa\n', b'bbb\n'],
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                    [b'aaa\n', b'bbb\n', b'222\n'])
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        self.assertEqual(b''.join(m3.merge_lines()),
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                         b'aaa\nbbb\n222\n')
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    def test_append_agreement(self):
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        m3 = Merge3([b'aaa\n', b'bbb\n'],
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                    [b'aaa\n', b'bbb\n', b'222\n'],
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                    [b'aaa\n', b'bbb\n', b'222\n'])
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        self.assertEqual(b''.join(m3.merge_lines()),
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                         b'aaa\nbbb\n222\n')
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    def test_append_clash(self):
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        m3 = Merge3([b'aaa\n', b'bbb\n'],
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                    [b'aaa\n', b'bbb\n', b'222\n'],
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                    [b'aaa\n', b'bbb\n', b'333\n'])
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        ml = m3.merge_lines(name_a=b'a',
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                            name_b=b'b',
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                            start_marker=b'<<',
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                            mid_marker=b'--',
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                            end_marker=b'>>')
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        self.assertEqual(b''.join(ml),
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                         b'aaa\n'
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                         b'bbb\n'
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                         b'<< a\n'
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                         b'222\n'
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                         b'--\n'
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                         b'333\n'
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                         b'>> b\n'
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                         )
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    def test_insert_agreement(self):
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        m3 = Merge3([b'aaa\n', b'bbb\n'],
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                    [b'aaa\n', b'222\n', b'bbb\n'],
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                    [b'aaa\n', b'222\n', b'bbb\n'])
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        ml = m3.merge_lines(name_a=b'a',
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                            name_b=b'b',
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                            start_marker=b'<<',
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                            mid_marker=b'--',
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                            end_marker=b'>>')
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        self.assertEqual(b''.join(ml), b'aaa\n222\nbbb\n')
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    def test_insert_clash(self):
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        """Both try to insert lines in the same place."""
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        m3 = Merge3([b'aaa\n', b'bbb\n'],
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                    [b'aaa\n', b'111\n', b'bbb\n'],
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                    [b'aaa\n', b'222\n', b'bbb\n'])
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        self.assertEqual(m3.find_unconflicted(),
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                         [(0, 1), (1, 2)])
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        self.assertEqual(list(m3.find_sync_regions()),
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                         [(0, 1,  0, 1,  0, 1),
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                          (1, 2,  2, 3,  2, 3),
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                          (2, 2,  3, 3,  3, 3)])
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        self.assertEqual(list(m3.merge_regions()),
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                         [(b'unchanged', 0, 1),
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                          (b'conflict', 1, 1,  1, 2,  1, 2),
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                          (b'unchanged', 1, 2)])
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        self.assertEqual(list(m3.merge_groups()),
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                         [(b'unchanged', [b'aaa\n']),
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                          (b'conflict', [], [b'111\n'], [b'222\n']),
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                          (b'unchanged', [b'bbb\n']),
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                          ])
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        ml = m3.merge_lines(name_a=b'a',
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                            name_b=b'b',
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                            start_marker=b'<<',
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                            mid_marker=b'--',
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                            end_marker=b'>>')
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        self.assertEqual(b''.join(ml),
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b'''aaa
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<< a
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111
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--
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222
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>> b
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bbb
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''')
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    def test_replace_clash(self):
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        """Both try to insert lines in the same place."""
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        m3 = Merge3([b'aaa', b'000', b'bbb'],
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                    [b'aaa', b'111', b'bbb'],
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                    [b'aaa', b'222', b'bbb'])
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        self.assertEqual(m3.find_unconflicted(),
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                         [(0, 1), (2, 3)])
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        self.assertEqual(list(m3.find_sync_regions()),
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                         [(0, 1,  0, 1,  0, 1),
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                           (2, 3,  2, 3,  2, 3),
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                           (3, 3,  3, 3,  3, 3)])
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    def test_replace_multi(self):
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        """Replacement with regions of different size."""
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        m3 = Merge3([b'aaa', b'000', b'000', b'bbb'],
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                    [b'aaa', b'111', b'111', b'111', b'bbb'],
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                    [b'aaa', b'222', b'222', b'222', b'222', b'bbb'])
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        self.assertEqual(m3.find_unconflicted(),
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                         [(0, 1), (3, 4)])
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        self.assertEqual(list(m3.find_sync_regions()),
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                         [(0, 1,  0, 1,  0, 1),
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                          (3, 4,  4, 5,  5, 6),
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                          (4, 4,  5, 5,  6, 6)])
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    def test_merge_poem(self):
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        """Test case from diff3 manual"""
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        m3 = Merge3(TZU, LAO, TAO)
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        ml = list(m3.merge_lines(b'LAO', b'TAO'))
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        self.log(b'merge result:')
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        self.log(b''.join(ml))
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        self.assertEqual(ml, MERGED_RESULT)
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    def test_binary(self):
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        with self.assertRaises(error.Abort):
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            Merge3([b'\x00'], [b'a'], [b'b'])
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    def test_dos_text(self):
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        base_text = b'a\r\n'
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        this_text = b'b\r\n'
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        other_text = b'c\r\n'
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        m3 = Merge3(base_text.splitlines(True), other_text.splitlines(True),
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                    this_text.splitlines(True))
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        m_lines = m3.merge_lines(b'OTHER', b'THIS')
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        self.assertEqual(b'<<<<<<< OTHER\r\nc\r\n=======\r\nb\r\n'
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                         b'>>>>>>> THIS\r\n'.splitlines(True), list(m_lines))
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    def test_mac_text(self):
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        base_text = b'a\r'
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        this_text = b'b\r'
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        other_text = b'c\r'
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        m3 = Merge3(base_text.splitlines(True), other_text.splitlines(True),
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                    this_text.splitlines(True))
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        m_lines = m3.merge_lines(b'OTHER', b'THIS')
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        self.assertEqual(b'<<<<<<< OTHER\rc\r=======\rb\r'
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                         b'>>>>>>> THIS\r'.splitlines(True), list(m_lines))
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if __name__ == '__main__':
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    # hide the timer
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    import time
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    orig = time.time
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    try:
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        time.time = lambda: 0
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        unittest.main()
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    finally:
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        time.time = orig