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tree.commit('rev1', rev_id='rev1')
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self.build_tree_contents([('tree/file1', 'baz')])
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tree.commit('rev2', rev_id='rev2')
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extracted = dict((i, ''.join(b)) for i, b in
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[('file1-id', 'rev1', 'file1-old'),
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('file1-id', 'rev2', 'file1-new'),
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('file2-id', 'rev1', 'file2'),