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DIFF_1 = """--- %(filename)s\t%(old_date)s
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+++ %(filename)s\t%(new_date)s
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DIFF_2 = """--- test_file\t%(old_date)s
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+++ test_file\t%(new_date)s
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def _check_diff(self, diff=DIFF_1, filename='test_file'):
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old_tree = self.tree.basis_tree()