{"cluster1:0", "cluster2:0"},
      {"cluster1:0", "mul:0"},
      {"cluster2:0", "mul:1"},
      {"x:0", "cluster1:0"}};
  EXPECT_EQ(expected_edges, GraphEdges(*graph));
}

const Node* FindNodeByName(const Graph& graph, const string& name) {
  for (const Node* node : graph.nodes()) {
    if (node->name() == name) return node;
  }
  return nullptr;
}

bool HasGuaranteeConstAttr(const Node& n) {