~bzr-pqm/bzr/bzr.dev

# Copyright (C) 2006 Canonical Ltd

#

# 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

"""Tests of the parent related functions of WorkingTrees."""

from errno import EEXIST

import os

from bzrlib import (

    errors,

    osutils,

    revision as _mod_revision,

    symbol_versioning,

    )

from bzrlib.inventory import (

    Inventory,

    InventoryFile,

    InventoryDirectory,

    InventoryLink,

    )

from bzrlib.revision import Revision

from bzrlib.tests import (

    KnownFailure,

    SymlinkFeature,

    TestNotApplicable,

    UnicodeFilenameFeature,

    )

from bzrlib.tests.workingtree_implementations import TestCaseWithWorkingTree

from bzrlib.uncommit import uncommit

class TestParents(TestCaseWithWorkingTree):

    def assertConsistentParents(self, expected, tree):

        """Check that the parents found are as expected.

        This test helper also checks that they are consistent with

        the pre-get_parent_ids() api - which is now deprecated.

        """

        self.assertEqual(expected, tree.get_parent_ids())

        if expected == []:

            self.assertEqual(_mod_revision.NULL_REVISION,

                             _mod_revision.ensure_null(tree.last_revision()))

        else:

            self.assertEqual(expected[0], tree.last_revision())

class TestGetParents(TestParents):

    def test_get_parents(self):

        t = self.make_branch_and_tree('.')

        self.assertEqual([], t.get_parent_ids())

class TestSetParents(TestParents):

    def test_set_no_parents(self):

        t = self.make_branch_and_tree('.')

        t.set_parent_trees([])

        self.assertEqual([], t.get_parent_ids())

        # now give it a real parent, and then set it to no parents again.

        t.commit('first post')

        t.set_parent_trees([])

        self.assertConsistentParents([], t)

    def test_set_null_parent(self):

        t = self.make_branch_and_tree('.')

        self.assertRaises(errors.ReservedId, t.set_parent_ids, ['null:'],

                          allow_leftmost_as_ghost=True)

        self.assertRaises(errors.ReservedId, t.set_parent_trees,

                          [('null:', None)], allow_leftmost_as_ghost=True)

    def test_set_one_ghost_parent_rejects(self):

        t = self.make_branch_and_tree('.')

        self.assertRaises(errors.GhostRevisionUnusableHere,

            t.set_parent_trees, [('missing-revision-id', None)])

    def test_set_one_ghost_parent_force(self):

        t = self.make_branch_and_tree('.')

        t.set_parent_trees([('missing-revision-id', None)],

            allow_leftmost_as_ghost=True)

        self.assertConsistentParents(['missing-revision-id'], t)

    def test_set_two_parents_one_ghost(self):

        t = self.make_branch_and_tree('.')

        revision_in_repo = t.commit('first post')

        # remove the tree's history

        uncommit(t.branch, tree=t)

        rev_tree = t.branch.repository.revision_tree(revision_in_repo)

        t.set_parent_trees([(revision_in_repo, rev_tree),

            ('another-missing', None)])

        self.assertConsistentParents([revision_in_repo, 'another-missing'], t)

    def test_set_three_parents(self):

        t = self.make_branch_and_tree('.')

        first_revision = t.commit('first post')

        uncommit(t.branch, tree=t)

        second_revision = t.commit('second post')

        uncommit(t.branch, tree=t)

        third_revision = t.commit('third post')

        uncommit(t.branch, tree=t)

        rev_tree1 = t.branch.repository.revision_tree(first_revision)

        rev_tree2 = t.branch.repository.revision_tree(second_revision)

        rev_tree3 = t.branch.repository.revision_tree(third_revision)

        t.set_parent_trees([(first_revision, rev_tree1),

            (second_revision, rev_tree2),

            (third_revision, rev_tree3)])

        self.assertConsistentParents(

            [first_revision, second_revision, third_revision], t)

    def test_set_no_parents_ids(self):

        t = self.make_branch_and_tree('.')

        t.set_parent_ids([])

        self.assertEqual([], t.get_parent_ids())

        # now give it a real parent, and then set it to no parents again.

        t.commit('first post')

        t.set_parent_ids([])

        self.assertConsistentParents([], t)

    def test_set_one_ghost_parent_ids_rejects(self):

        t = self.make_branch_and_tree('.')

        self.assertRaises(errors.GhostRevisionUnusableHere,

            t.set_parent_ids, ['missing-revision-id'])

    def test_set_one_ghost_parent_ids_force(self):

        t = self.make_branch_and_tree('.')

        t.set_parent_ids(['missing-revision-id'],

            allow_leftmost_as_ghost=True)

        self.assertConsistentParents(['missing-revision-id'], t)

    def test_set_two_parents_one_ghost_ids(self):

        t = self.make_branch_and_tree('.')

        revision_in_repo = t.commit('first post')

        # remove the tree's history

        uncommit(t.branch, tree=t)

        rev_tree = t.branch.repository.revision_tree(revision_in_repo)

        t.set_parent_ids([revision_in_repo, 'another-missing'])

        self.assertConsistentParents([revision_in_repo, 'another-missing'], t)

    def test_set_three_parents_ids(self):

        t = self.make_branch_and_tree('.')

        first_revision = t.commit('first post')

        uncommit(t.branch, tree=t)

        second_revision = t.commit('second post')

        uncommit(t.branch, tree=t)

        third_revision = t.commit('third post')

        uncommit(t.branch, tree=t)

        rev_tree1 = t.branch.repository.revision_tree(first_revision)

        rev_tree2 = t.branch.repository.revision_tree(second_revision)

        rev_tree3 = t.branch.repository.revision_tree(third_revision)

        t.set_parent_ids([first_revision, second_revision, third_revision])

        self.assertConsistentParents(

            [first_revision, second_revision, third_revision], t)

    def test_set_duplicate_parent_ids(self):

        t = self.make_branch_and_tree('.')

        rev1 = t.commit('first post')

        uncommit(t.branch, tree=t)

        rev2 = t.commit('second post')

        uncommit(t.branch, tree=t)

        rev3 = t.commit('third post')

        uncommit(t.branch, tree=t)

        t.set_parent_ids([rev1, rev2, rev2, rev3])

        # We strip the duplicate, but preserve the ordering

        self.assertConsistentParents([rev1, rev2, rev3], t)

    def test_set_duplicate_parent_trees(self):

        t = self.make_branch_and_tree('.')

        rev1 = t.commit('first post')

        uncommit(t.branch, tree=t)

        rev2 = t.commit('second post')

        uncommit(t.branch, tree=t)

        rev3 = t.commit('third post')

        uncommit(t.branch, tree=t)

        rev_tree1 = t.branch.repository.revision_tree(rev1)

        rev_tree2 = t.branch.repository.revision_tree(rev2)

        rev_tree3 = t.branch.repository.revision_tree(rev3)

        t.set_parent_trees([(rev1, rev_tree1), (rev2, rev_tree2),

                            (rev2, rev_tree2), (rev3, rev_tree3)])

        # We strip the duplicate, but preserve the ordering

        self.assertConsistentParents([rev1, rev2, rev3], t)

    def test_set_parent_ids_in_ancestry(self):

        t = self.make_branch_and_tree('.')

        rev1 = t.commit('first post')

        rev2 = t.commit('second post')

        rev3 = t.commit('third post')

        # Reset the tree, back to rev1

        t.set_parent_ids([rev1])

        t.branch.set_last_revision_info(1, rev1)

        self.assertConsistentParents([rev1], t)

        t.set_parent_ids([rev1, rev2, rev3])

        # rev2 is in the ancestry of rev3, so it will be filtered out

        self.assertConsistentParents([rev1, rev3], t)

        # Order should be preserved, and the first revision should always be

        # kept

        t.set_parent_ids([rev2, rev3, rev1])

        self.assertConsistentParents([rev2, rev3], t)

    def test_set_parent_trees_in_ancestry(self):

        t = self.make_branch_and_tree('.')

        rev1 = t.commit('first post')

        rev2 = t.commit('second post')

        rev3 = t.commit('third post')

        # Reset the tree, back to rev1

        t.set_parent_ids([rev1])

        t.branch.set_last_revision_info(1, rev1)

        self.assertConsistentParents([rev1], t)

        rev_tree1 = t.branch.repository.revision_tree(rev1)

        rev_tree2 = t.branch.repository.revision_tree(rev2)

        rev_tree3 = t.branch.repository.revision_tree(rev3)

        t.set_parent_trees([(rev1, rev_tree1), (rev2, rev_tree2),

                            (rev3, rev_tree3)])

        # rev2 is in the ancestry of rev3, so it will be filtered out

        self.assertConsistentParents([rev1, rev3], t)

        # Order should be preserved, and the first revision should always be

        # kept

        t.set_parent_trees([(rev2, rev_tree2), (rev1, rev_tree1),

                            (rev3, rev_tree3)])

        self.assertConsistentParents([rev2, rev3], t)

    def test_unicode_symlink(self):

        # this tests bug #272444

        self.requireFeature(SymlinkFeature)

        self.requireFeature(UnicodeFilenameFeature)

        tree = self.make_branch_and_tree('tree1')

        # The link points to a file whose name is an omega

        # U+03A9 GREEK CAPITAL LETTER OMEGA

        # UTF-8: ce a9  UTF-16BE: 03a9  Decimal: Ω

        os.symlink(u'\u03a9','tree1/link_name')

        tree.add(['link_name'],['link-id'])

        try:

            # the actual commit occurs without errors (strangely):

            revision1 = tree.commit('added a link to a Unicode target')

            # python 2.4 failed with UnicodeDecodeError on this commit:

            revision2 = tree.commit('this revision will be discarded')

            # python 2.5 failed with UnicodeEncodeError on set_parent_ids:

            tree.set_parent_ids([revision1])

        except (UnicodeEncodeError, UnicodeDecodeError):

            raise KnownFailure('there is no support for'

                               ' symlinks to non-ASCII targets (bug #272444)')

class TestAddParent(TestParents):

    def test_add_first_parent_id(self):

        """Test adding the first parent id"""

        tree = self.make_branch_and_tree('.')

        first_revision = tree.commit('first post')

        uncommit(tree.branch, tree=tree)

        tree.add_parent_tree_id(first_revision)

        self.assertConsistentParents([first_revision], tree)

    def test_add_first_parent_id_ghost_rejects(self):

        """Test adding the first parent id - as a ghost"""

        tree = self.make_branch_and_tree('.')

        self.assertRaises(errors.GhostRevisionUnusableHere,

            tree.add_parent_tree_id, 'first-revision')

    def test_add_first_parent_id_ghost_force(self):

        """Test adding the first parent id - as a ghost"""

        tree = self.make_branch_and_tree('.')

        tree.add_parent_tree_id('first-revision', allow_leftmost_as_ghost=True)

        self.assertConsistentParents(['first-revision'], tree)

    def test_add_second_parent_id_with_ghost_first(self):

        """Test adding the second parent when the first is a ghost."""

        tree = self.make_branch_and_tree('.')

        tree.add_parent_tree_id('first-revision', allow_leftmost_as_ghost=True)

        tree.add_parent_tree_id('second')

        self.assertConsistentParents(['first-revision', 'second'], tree)

    def test_add_second_parent_id(self):

        """Test adding the second parent id"""

        tree = self.make_branch_and_tree('.')

        first_revision = tree.commit('first post')

        uncommit(tree.branch, tree=tree)

        second_revision = tree.commit('second post')

        tree.add_parent_tree_id(first_revision)

        self.assertConsistentParents([second_revision, first_revision], tree)

    def test_add_second_parent_id_ghost(self):

        """Test adding the second parent id - as a ghost"""

        tree = self.make_branch_and_tree('.')

        first_revision = tree.commit('first post')

        tree.add_parent_tree_id('second')

        self.assertConsistentParents([first_revision, 'second'], tree)

    def test_add_first_parent_tree(self):

        """Test adding the first parent id"""

        tree = self.make_branch_and_tree('.')

        first_revision = tree.commit('first post')

        uncommit(tree.branch, tree=tree)

        tree.add_parent_tree((first_revision,

            tree.branch.repository.revision_tree(first_revision)))

        self.assertConsistentParents([first_revision], tree)

    def test_add_first_parent_tree_ghost_rejects(self):

        """Test adding the first parent id - as a ghost"""

        tree = self.make_branch_and_tree('.')

        self.assertRaises(errors.GhostRevisionUnusableHere,

            tree.add_parent_tree, ('first-revision', None))

    def test_add_first_parent_tree_ghost_force(self):

        """Test adding the first parent id - as a ghost"""

        tree = self.make_branch_and_tree('.')

        tree.add_parent_tree(('first-revision', None),

            allow_leftmost_as_ghost=True)

        self.assertConsistentParents(['first-revision'], tree)

    def test_add_second_parent_tree(self):

        """Test adding the second parent id"""

        tree = self.make_branch_and_tree('.')

        first_revision = tree.commit('first post')

        uncommit(tree.branch, tree=tree)

        second_revision = tree.commit('second post')

        tree.add_parent_tree((first_revision,

            tree.branch.repository.revision_tree(first_revision)))

        self.assertConsistentParents([second_revision, first_revision], tree)

    def test_add_second_parent_tree_ghost(self):

        """Test adding the second parent id - as a ghost"""

        tree = self.make_branch_and_tree('.')

        first_revision = tree.commit('first post')

        tree.add_parent_tree(('second', None))

        self.assertConsistentParents([first_revision, 'second'], tree)

class UpdateToOneParentViaDeltaTests(TestCaseWithWorkingTree):

    """Tests for the update_basis_by_delta call.

    This is intuitively defined as 'apply an inventory delta to the basis and

    discard other parents', but for trees that have an inventory that is not

    managed as a tree-by-id, the implementation requires roughly duplicated

    tests with those for apply_inventory_delta on the main tree.

    """

    def assertDeltaApplicationResultsInExpectedBasis(self, tree, revid, delta,

        expected_inventory):

        tree.lock_write()

        try:

            tree.update_basis_by_delta(revid, delta)

        finally:

            tree.unlock()

        # check the last revision was adjusted to rev_id

        self.assertEqual(revid, tree.last_revision())

        # check the parents are what we expect

        self.assertEqual([revid], tree.get_parent_ids())

        # check that the basis tree has the inventory we expect from applying

        # the delta.

        result_basis = tree.basis_tree()

        result_basis.lock_read()

        try:

            self.assertEqual(expected_inventory, result_basis.inventory)

        finally:

            result_basis.unlock()

    def make_inv_delta(self, old, new):

        """Make an inventory delta from two inventories."""

        old_ids = set(old._byid.iterkeys())

        new_ids = set(new._byid.iterkeys())

        adds = new_ids - old_ids

        deletes = old_ids - new_ids

        common = old_ids.intersection(new_ids)

        delta = []

        for file_id in deletes:

            delta.append((old.id2path(file_id), None, file_id, None))

        for file_id in adds:

            delta.append((None, new.id2path(file_id), file_id, new[file_id]))

        for file_id in common:

            if old[file_id] != new[file_id]:

                delta.append((old.id2path(file_id), new.id2path(file_id),

                    file_id, new[file_id]))

        return delta

    def fake_up_revision(self, tree, revid, shape):

        tree.lock_write()

        try:

            tree.branch.repository.start_write_group()

            try:

                if shape.root.revision is None:

                    shape.root.revision = revid

                sha1 = tree.branch.repository.add_inventory(revid, shape, [])

                rev = Revision(timestamp=0,

                               timezone=None,

                               committer="Foo Bar <foo@example.com>",

                               message="Message",

                               inventory_sha1=sha1,

                               revision_id=revid)

                tree.branch.repository.add_revision(revid, rev)

            except:

                tree.branch.repository.abort_write_group()

                raise

            else:

                tree.branch.repository.commit_write_group()

        finally:

            tree.unlock()

    def add_entry(self, inv, rev_id, entry):

        entry.revision = rev_id

        inv.add(entry)

    def add_dir(self, inv, rev_id, file_id, parent_id, name):

        new_dir = InventoryDirectory(file_id, name, parent_id)

        self.add_entry(inv, rev_id, new_dir)

    def add_file(self, inv, rev_id, file_id, parent_id, name, sha, size):

        new_file = InventoryFile(file_id, name, parent_id)

        new_file.text_sha1 = sha

        new_file.text_size = size

        self.add_entry(inv, rev_id, new_file)

    def add_link(self, inv, rev_id, file_id, parent_id, name, target):

        new_link = InventoryLink(file_id, name, parent_id)

        new_link.symlink_target = target

        self.add_entry(inv, rev_id, new_link)

    def add_new_root(self, new_shape, old_revid, new_revid):

        if self.bzrdir_format.repository_format.rich_root_data:

            self.add_dir(new_shape, old_revid, 'root-id', None, '')

        else:

            self.add_dir(new_shape, new_revid, 'root-id', None, '')

    def assertTransitionFromBasisToShape(self, basis_shape, basis_revid,

        new_shape, new_revid, extra_parent=None):

        # set the inventory revision ids.

        basis_shape.revision_id = basis_revid

        new_shape.revision_id = new_revid

        delta = self.make_inv_delta(basis_shape, new_shape)

        tree = self.make_branch_and_tree('tree')

        # the shapes need to be in the tree's repository to be able to set them

        # as a parent, but the file content is not needed.

        if basis_revid is not None:

            self.fake_up_revision(tree, basis_revid, basis_shape)

            parents = [basis_revid]

            if extra_parent is not None:

                parents.append(extra_parent)

            tree.set_parent_ids(parents)

        self.fake_up_revision(tree, new_revid, new_shape)

        # give tree an inventory of new_shape

        tree._write_inventory(new_shape)

        self.assertDeltaApplicationResultsInExpectedBasis(tree, new_revid,

            delta, new_shape)

        # The tree should be internally consistent; while this is a moderately

        # large hammer, this is a particularly sensitive area of code, so the

        # extra assurance is well worth it.

        tree._validate()

        osutils.rmtree('tree')

    def test_no_parents_just_root(self):

        """Test doing an empty commit - no parent, set a root only."""

        basis_shape = Inventory(root_id=None) # empty tree

        new_shape = Inventory() # tree with a root

        self.assertTransitionFromBasisToShape(basis_shape, None, new_shape,

            'new_parent')

    def test_no_parents_full_tree(self):

        """Test doing a regular initial commit with files and dirs."""

        basis_shape = Inventory(root_id=None) # empty tree

        revid = 'new-parent'

        new_shape = Inventory(root_id=None)

        self.add_dir(new_shape, revid, 'root-id', None, '')

        self.add_link(new_shape, revid, 'link-id', 'root-id', 'link', 'target')

        self.add_file(new_shape, revid, 'file-id', 'root-id', 'file', '1' * 32,

            12)

        self.add_dir(new_shape, revid, 'dir-id', 'root-id', 'dir')

        self.add_file(new_shape, revid, 'subfile-id', 'dir-id', 'subfile',

            '2' * 32, 24)

        self.assertTransitionFromBasisToShape(basis_shape, None, new_shape,

            revid)

    def test_file_content_change(self):

        old_revid = 'old-parent'

        basis_shape = Inventory(root_id=None)

        self.add_dir(basis_shape, old_revid, 'root-id', None, '')

        self.add_file(basis_shape, old_revid, 'file-id', 'root-id', 'file',

            '1' * 32, 12)

        new_revid = 'new-parent'

        new_shape = Inventory(root_id=None)

        self.add_new_root(new_shape, old_revid, new_revid)

        self.add_file(new_shape, new_revid, 'file-id', 'root-id', 'file',

            '2' * 32, 24)

        self.assertTransitionFromBasisToShape(basis_shape, old_revid,

            new_shape, new_revid)

    def test_link_content_change(self):

        old_revid = 'old-parent'

        basis_shape = Inventory(root_id=None)

        self.add_dir(basis_shape, old_revid, 'root-id', None, '')

        self.add_link(basis_shape, old_revid, 'link-id', 'root-id', 'link',

            'old-target')

        new_revid = 'new-parent'

        new_shape = Inventory(root_id=None)

        self.add_new_root(new_shape, old_revid, new_revid)

        self.add_link(new_shape, new_revid, 'link-id', 'root-id', 'link',

            'new-target')

        self.assertTransitionFromBasisToShape(basis_shape, old_revid,

            new_shape, new_revid)

    def test_kind_changes(self):

        def do_file(inv, revid):

            self.add_file(inv, revid, 'path-id', 'root-id', 'path', '1' * 32,

                12)

        def do_link(inv, revid):

            self.add_link(inv, revid, 'path-id', 'root-id', 'path', 'target')

        def do_dir(inv, revid):

            self.add_dir(inv, revid, 'path-id', 'root-id', 'path')

        for old_factory in (do_file, do_link, do_dir):

            for new_factory in (do_file, do_link, do_dir):

                if old_factory == new_factory:

                    continue

                old_revid = 'old-parent'

                basis_shape = Inventory(root_id=None)

                self.add_dir(basis_shape, old_revid, 'root-id', None, '')

                old_factory(basis_shape, old_revid)

                new_revid = 'new-parent'

                new_shape = Inventory(root_id=None)

                self.add_new_root(new_shape, old_revid, new_revid)

                new_factory(new_shape, new_revid)

                self.assertTransitionFromBasisToShape(basis_shape, old_revid,

                    new_shape, new_revid)

    def test_content_from_second_parent_is_dropped(self):

        left_revid = 'left-parent'

        basis_shape = Inventory(root_id=None)

        self.add_dir(basis_shape, left_revid, 'root-id', None, '')

        self.add_link(basis_shape, left_revid, 'link-id', 'root-id', 'link',

            'left-target')

        # the right shape has content - file, link, subdir with a child,

        # that should all be discarded by the call.

        right_revid = 'right-parent'

        right_shape = Inventory(root_id=None)

        self.add_dir(right_shape, left_revid, 'root-id', None, '')

        self.add_link(right_shape, right_revid, 'link-id', 'root-id', 'link',

            'some-target')

        self.add_dir(right_shape, right_revid, 'subdir-id', 'root-id', 'dir')

        self.add_file(right_shape, right_revid, 'file-id', 'subdir-id', 'file',

            '2' * 32, 24)

        new_revid = 'new-parent'

        new_shape = Inventory(root_id=None)

        self.add_new_root(new_shape, left_revid, new_revid)

        self.add_link(new_shape, new_revid, 'link-id', 'root-id', 'link',

            'new-target')

        self.assertTransitionFromBasisToShape(basis_shape, left_revid,

            new_shape, new_revid, right_revid)

    def test_parent_id_changed(self):

        # test that when the only change to an entry is its parent id changing

        # that it is handled correctly (that is it keeps the same path)

        old_revid = 'old-parent'

        basis_shape = Inventory(root_id=None)

        self.add_dir(basis_shape, old_revid, 'root-id', None, '')

        self.add_dir(basis_shape, old_revid, 'orig-parent-id', 'root-id', 'dir')

        self.add_dir(basis_shape, old_revid, 'dir-id', 'orig-parent-id', 'dir')

        new_revid = 'new-parent'

        new_shape = Inventory(root_id=None)

        self.add_new_root(new_shape, old_revid, new_revid)

        self.add_dir(new_shape, new_revid, 'new-parent-id', 'root-id', 'dir')

        self.add_dir(new_shape, new_revid, 'dir-id', 'new-parent-id', 'dir')

        self.assertTransitionFromBasisToShape(basis_shape, old_revid,

            new_shape, new_revid)

    def test_name_changed(self):

        # test that when the only change to an entry is its name changing that

        # it is handled correctly (that is it keeps the same parent id)

        old_revid = 'old-parent'

        basis_shape = Inventory(root_id=None)

        self.add_dir(basis_shape, old_revid, 'root-id', None, '')

        self.add_dir(basis_shape, old_revid, 'parent-id', 'root-id', 'origdir')

        self.add_dir(basis_shape, old_revid, 'dir-id', 'parent-id', 'olddir')

        new_revid = 'new-parent'

        new_shape = Inventory(root_id=None)

        self.add_new_root(new_shape, old_revid, new_revid)

        self.add_dir(new_shape, new_revid, 'parent-id', 'root-id', 'newdir')

        self.add_dir(new_shape, new_revid, 'dir-id', 'parent-id', 'newdir')

        self.assertTransitionFromBasisToShape(basis_shape, old_revid,

            new_shape, new_revid)

    def test_parent_child_swap(self):

        # test a A->A/B and A/B->A path swap.

        old_revid = 'old-parent'

        basis_shape = Inventory(root_id=None)

        self.add_dir(basis_shape, old_revid, 'root-id', None, '')

        self.add_dir(basis_shape, old_revid, 'dir-id-A', 'root-id', 'A')

        self.add_dir(basis_shape, old_revid, 'dir-id-B', 'dir-id-A', 'B')

        self.add_link(basis_shape, old_revid, 'link-id-C', 'dir-id-B', 'C', 'C')

        new_revid = 'new-parent'

        new_shape = Inventory(root_id=None)

        self.add_new_root(new_shape, old_revid, new_revid)

        self.add_dir(new_shape, new_revid, 'dir-id-B', 'root-id', 'A')

        self.add_dir(new_shape, new_revid, 'dir-id-A', 'dir-id-B', 'B')

        self.add_link(new_shape, new_revid, 'link-id-C', 'dir-id-A', 'C', 'C')

        self.assertTransitionFromBasisToShape(basis_shape, old_revid,

            new_shape, new_revid)

    def test_parent_deleted_child_renamed(self):

        # test a A->None and A/B->A.

        old_revid = 'old-parent'

        basis_shape = Inventory(root_id=None)

        self.add_dir(basis_shape, old_revid, 'root-id', None, '')

        self.add_dir(basis_shape, old_revid, 'dir-id-A', 'root-id', 'A')

        self.add_dir(basis_shape, old_revid, 'dir-id-B', 'dir-id-A', 'B')

        self.add_link(basis_shape, old_revid, 'link-id-C', 'dir-id-B', 'C', 'C')

        new_revid = 'new-parent'

        new_shape = Inventory(root_id=None)

        self.add_new_root(new_shape, old_revid, new_revid)

        self.add_dir(new_shape, new_revid, 'dir-id-B', 'root-id', 'A')

        self.add_link(new_shape, old_revid, 'link-id-C', 'dir-id-B', 'C', 'C')

        self.assertTransitionFromBasisToShape(basis_shape, old_revid,