def METHOD_NAME(self):
    self.all_stacks[4].obsolete = True
    self.all_stacks[5].obsolete = True
    self.pruner.prune()
    assert self.plans[0].executions[0][0] == "delete"
    assert set(self.executed_stacks) == {self.all_stacks[4], self.all_stacks[5]}