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self.build_tree_contents([('hello', 'hello world!')])
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tree.commit(message='fixing hello')
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output = self.run_bzr('diff -r 2..3', retcode=1)[0]
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output = self.run_bzr('diff -c 3', retcode=1)[0]
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output = self.run_bzr('diff -r last:3..last:1', retcode=1)[0]
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output = self.run_bzr('diff -c last:2', retcode=1)[0]