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29
tree = self.make_branch_and_tree('a')
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tree.commit('empty commit')
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tree2 = self.make_branch_and_tree('b')
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tree2.add_parent_tree_id('some-ghost', allow_leftmost_as_ghost=True)
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show_pending_merges(tree2, output)
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self.assertContainsRe(output.getvalue(), 'empty commit')