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Viewing changes to bzrlib/tests/test_versionedfile.py

  • Committer: Martin Pool
  • Date: 2009-09-14 02:30:23 UTC
  • mto: This revision was merged to the branch mainline in revision 4693.
  • Revision ID: mbp@sourcefrog.net-20090914023023-ros0f3ndo04j3bww
https://launchpad.net/bugs/429151
Clearer docs about bzr help.  (Thanks to Naoki)

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bzrlib/tests/test_versionedfile.py
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# Copyright (C) 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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# 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, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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"""Tests for VersionedFile classes"""
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from bzrlib import (
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    errors,
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    groupcompress,
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    multiparent,
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    tests,
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    versionedfile,
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    )
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class Test_MPDiffGenerator(tests.TestCaseWithMemoryTransport):
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    # Should this be a per vf test?
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    def make_vf(self):
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        t = self.get_transport('')
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        factory = groupcompress.make_pack_factory(True, True, 1)
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        return factory(t)
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    def make_three_vf(self):
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        vf = self.make_vf()
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        vf.add_lines(('one',), (), ['first\n'])
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        vf.add_lines(('two',), [('one',)], ['first\n', 'second\n'])
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        vf.add_lines(('three',), [('one',), ('two',)],
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                    ['first\n', 'second\n', 'third\n'])
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        return vf
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    def test_finds_parents(self):
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        vf = self.make_three_vf()
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        gen = versionedfile._MPDiffGenerator(vf, [('three',)])
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        needed_keys, refcount = gen._find_needed_keys()
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        self.assertEqual(sorted([('one',), ('two',), ('three',)]),
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                         sorted(needed_keys))
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        self.assertEqual({('one',): 1, ('two',): 1}, refcount)
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    def test_ignores_ghost_parents(self):
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        # If a parent is a ghost, it is just ignored
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        vf = self.make_vf()
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        vf.add_lines(('two',), [('one',)], ['first\n', 'second\n'])
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        gen = versionedfile._MPDiffGenerator(vf, [('two',)])
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        needed_keys, refcount = gen._find_needed_keys()
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        self.assertEqual(sorted([('two',)]), sorted(needed_keys))
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        # It is returned, but we don't really care as we won't extract it
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        self.assertEqual({('one',): 1}, refcount)
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        self.assertEqual([('one',)], sorted(gen.ghost_parents))
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        self.assertEqual([], sorted(gen.present_parents))
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    def test_raises_on_ghost_keys(self):
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        # If the requested key is a ghost, then we have a problem
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        vf = self.make_vf()
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        gen = versionedfile._MPDiffGenerator(vf, [('one',)])
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        self.assertRaises(errors.RevisionNotPresent,
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                          gen._find_needed_keys)
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    def test_refcount_multiple_children(self):
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        vf = self.make_three_vf()
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        gen = versionedfile._MPDiffGenerator(vf, [('two',), ('three',)])
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        needed_keys, refcount = gen._find_needed_keys()
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        self.assertEqual(sorted([('one',), ('two',), ('three',)]),
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                         sorted(needed_keys))
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        self.assertEqual({('one',): 2, ('two',): 1}, refcount)
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        self.assertEqual([('one',)], sorted(gen.present_parents))
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    def test_process_contents(self):
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        vf = self.make_three_vf()
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        gen = versionedfile._MPDiffGenerator(vf, [('two',), ('three',)])
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        gen._find_needed_keys()
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        self.assertEqual({('two',): (('one',),),
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                          ('three',): (('one',), ('two',))},
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                         gen.parent_map)
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        self.assertEqual({('one',): 2, ('two',): 1}, gen.refcounts)
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        self.assertEqual(sorted([('one',), ('two',), ('three',)]),
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                         sorted(gen.needed_keys))
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        stream = vf.get_record_stream(gen.needed_keys, 'topological', True)
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        record = stream.next()
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        self.assertEqual(('one',), record.key)
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        # one is not needed in the output, but it is needed by children. As
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        # such, it should end up in the various caches
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        gen._process_one_record(record.key, record.get_bytes_as('chunked'))
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        # The chunks should be cached, the refcount untouched
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        self.assertEqual([('one',)], gen.chunks.keys())
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        self.assertEqual({('one',): 2, ('two',): 1}, gen.refcounts)
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        self.assertEqual([], gen.diffs.keys())
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        # Next we get 'two', which is something we output, but also needed for
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        # three
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        record = stream.next()
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        self.assertEqual(('two',), record.key)
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        gen._process_one_record(record.key, record.get_bytes_as('chunked'))
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        # Both are now cached, and the diff for two has been extracted, and
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        # one's refcount has been updated. two has been removed from the
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        # parent_map
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        self.assertEqual(sorted([('one',), ('two',)]),
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                         sorted(gen.chunks.keys()))
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        self.assertEqual({('one',): 1, ('two',): 1}, gen.refcounts)
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        self.assertEqual([('two',)], gen.diffs.keys())
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        self.assertEqual({('three',): (('one',), ('two',))},
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                         gen.parent_map)
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        # Finally 'three', which allows us to remove all parents from the
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        # caches
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        record = stream.next()
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        self.assertEqual(('three',), record.key)
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        gen._process_one_record(record.key, record.get_bytes_as('chunked'))
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        # Both are now cached, and the diff for two has been extracted, and
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        # one's refcount has been updated
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        self.assertEqual([], gen.chunks.keys())
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        self.assertEqual({}, gen.refcounts)
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        self.assertEqual(sorted([('two',), ('three',)]),
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                         sorted(gen.diffs.keys()))
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    def test_compute_diffs(self):
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        vf = self.make_three_vf()
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        # The content is in the order requested, even if it isn't topological
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        gen = versionedfile._MPDiffGenerator(vf, [('two',), ('three',),
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                                                  ('one',)])
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        diffs = gen.compute_diffs()
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        expected_diffs = [
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            multiparent.MultiParent([multiparent.ParentText(0, 0, 0, 1),
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                                     multiparent.NewText(['second\n'])]),
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            multiparent.MultiParent([multiparent.ParentText(1, 0, 0, 2),
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                                     multiparent.NewText(['third\n'])]),
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            multiparent.MultiParent([multiparent.NewText(['first\n'])]),
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            ]
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        self.assertEqual(expected_diffs, diffs)