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class TestBzrlibVersioning(tests.TestCase):
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"""Get tree for bzr source, if any."""
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self.permit_source_tree_branch_repo()
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# We don't know if these tests are being run from a checkout or branch
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# of bzr, from an installed copy, or from source unpacked from a
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# tarball. We don't construct a branch just for testing this, so we
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# just assert that it must either return None or the tree.
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"bzr tests aren't run from a bzr working tree")