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More work on roundtrip push support.

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tests/test_repository.py
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from bzrlib import (
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    errors,
 
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    inventory,
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    revision,
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    )
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from bzrlib.repository import (
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        self.assertEquals(tree.get_revision_id(), revid)
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        self.assertEquals("text\n", tree.get_file_text(tree.path2id("data")))
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    def test_get_inventory(self):
 
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        # GitRepository.get_inventory gives a GitInventory object with
 
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        # plausible entries for typical cases.
 
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        commit_id = self.simple_commit()
 
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        # Get the corresponding Inventory object.
 
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        revid = default_mapping.revision_id_foreign_to_bzr(commit_id)
 
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        repo = Repository.open('.')
 
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        inv = repo.get_inventory(revid)
 
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        self.assertIsInstance(inv, inventory.Inventory)
 
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        printed_inv = '\n'.join(
 
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            repr((path, entry.executable, entry))
 
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            for path, entry in inv.iter_entries())
 
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        self.assertEqualDiff(
 
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            printed_inv,
 
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            "('', False, GitInventoryDirectory('TREE_ROOT', u'', parent_id=None,"
 
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            " revision='"+default_mapping.revision_id_foreign_to_bzr("69c39cfa65962f3cf16b9b3eb08a15954e9d8590")+"'))\n"
 
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            "(u'data', False, GitInventoryFile('data', u'data',"
 
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            " parent_id='TREE_ROOT',"
 
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            " sha1='aa785adca3fcdfe1884ae840e13c6d294a2414e8', len=5, revision="+default_mapping.revid_prefix+":69c39cfa65962f3cf16b9b3eb08a15954e9d8590))\n"
 
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            "(u'executable', True, GitInventoryFile('executable', u'executable',"
 
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            " parent_id='TREE_ROOT',"
 
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            " sha1='040f06fd774092478d450774f5ba30c5da78acc8', len=7, revision="+default_mapping.revid_prefix+":69c39cfa65962f3cf16b9b3eb08a15954e9d8590))\n"
 
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            "(u'link', False, GitInventoryLink('link', u'link',"
 
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            " parent_id='TREE_ROOT', revision='"+default_mapping.revision_id_foreign_to_bzr("69c39cfa65962f3cf16b9b3eb08a15954e9d8590")+"'))\n"
 
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            "(u'subdir', False, GitInventoryDirectory('subdir', u'subdir',"
 
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            " parent_id='TREE_ROOT', revision='"+default_mapping.revision_id_foreign_to_bzr("69c39cfa65962f3cf16b9b3eb08a15954e9d8590")+"'))\n"
 
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            "(u'subdir/subfile', False, GitInventoryFile('subdir/subfile',"
 
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            " u'subfile', parent_id='subdir',"
 
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            " sha1='67b75c3e49f31fcadddbf9df6a1d8be8c3e44290', len=12, revision="+default_mapping.revid_prefix+":69c39cfa65962f3cf16b9b3eb08a15954e9d8590))")
 
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class TestGitRepository(tests.TestCaseWithTransport):
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    def test_all_revision_ids_none(self):
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        self.assertEquals(set([]), self.git_repo.all_revision_ids())
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    def test_get_known_graph_ancestry(self):
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        cid = self._do_commit()
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        revid = default_mapping.revision_id_foreign_to_bzr(cid)
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        g = self.git_repo.get_known_graph_ancestry([revid])
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        self.assertEquals(frozenset([revid]),
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            g.heads([revid]))
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        self.assertEqual([(revid, 0, (1,), True)],
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            [(n.key, n.merge_depth, n.revno, n.end_of_merge)
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                 for n in g.merge_sort(revid)])
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    def test_all_revision_ids(self):
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        commit_id = self._do_commit()
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        self.assertEquals(
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                set([default_mapping.revision_id_foreign_to_bzr(commit_id)]),
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                self.git_repo.all_revision_ids())
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    def test_get_ancestry_null(self):
 
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        self.assertEquals([None, revision.NULL_REVISION], self.git_repo.get_ancestry(revision.NULL_REVISION))
 
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    def assertIsNullInventory(self, inv):
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        self.assertEqual(inv.root, None)
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        self.assertEqual(inv.revision_id, revision.NULL_REVISION)
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        self.assertEqual(list(inv.iter_entries()), [])
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    def test_get_inventory_none(self):
 
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        # GitRepository.get_inventory(None) returns the null inventory.
 
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        repo = self.git_repo
 
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        inv = repo.get_inventory(revision.NULL_REVISION)
 
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        self.assertIsNullInventory(inv)
 
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    def test_revision_tree_none(self):
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        # GitRepository.revision_tree(None) returns the null tree.
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        repo = self.git_repo
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        tree = repo.revision_tree(revision.NULL_REVISION)
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        self.assertEqual(tree.get_revision_id(), revision.NULL_REVISION)
 
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        self.assertIsNullInventory(tree.inventory)
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    def test_get_parent_map_null(self):
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        self.assertEquals({revision.NULL_REVISION: ()},