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bzrlib/tests/test_tree.py
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        """This test tests the way Tree.compare() uses InterTree."""
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        old_optimisers = InterTree._optimisers
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        try:
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            InterTree._optimisers = set()
 
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            InterTree._optimisers = []
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            RecordingOptimiser.calls = []
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            InterTree.register_optimiser(RecordingOptimiser)
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            tree = self.make_branch_and_tree('1')