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ConfChangeType::AddNode, new_peer(5, 5));\n+    cluster.change_peer(r1, ConfChangeType::AddNode, new_peer(6, 6));\n+    cluster.change_peer(r1, ConfChangeType::RemoveNode, new_peer(2, 2));\n+    cluster.change_peer(r1, ConfChangeType::RemoveNode, new_peer(3, 3));\n+\n+    // refresh region info, maybe no need\n+    cluster.must_put(b\"k2\", b\"v2\");\n+\n+    // when network recover, 1 will send request vote to 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