Output Operation::output(int32_t i) const {
  CHECK_NOTNULL(node_);
  CHECK_GE(i, 0);
  CHECK_LT(i, node_->num_outputs());
  return Output(node_, i);
}

uint64 Operation::hash(int32_t index) const {
  return ::tensorflow::Hash64(reinterpret_cast<const char*>(&node_),
                              sizeof(Node*), index);
}

Operation::Inputs Operation::GetInputs(Node* node) {
  Operation::Inputs inputs;
  if (node != nullptr) {

  Output output(int32_t i) const;

  Node* node() const { return node_; }

  uint64 hash(int32_t index) const;

  bool operator==(const Operation& other) const { return node_ == other.node_; }

 private:
  typedef std::vector<std::pair<Node*, int32>> Inputs;
  static Inputs GetInputs(Node* node);

  Inputs inputs_;
  Node* node_;
};

/// Represents a tensor value produced by an Operation.

        def rootNode = Mock(Node)
        def node1 = Mock(Node)
        def node2 = Mock(Node)
        def node3 = Mock(Node)
        def node4 = Mock(Node)
        def node5 = Mock(Node)
        def node6 = Mock(Node)
        def node7 = Mock(Node)

        hierarchy.recordNodeAccessingLocations(rootNode, [root.absolutePath])
        hierarchy.recordNodeAccessingLocations(node1, [root.file("location").absolutePath])

		},
		// there are 2 regions, say regionChina(node1,node3,node4) and regionIndia(node2,node5), both regions have nodes that match the preference.
		// But there are more nodes(actually more existing pods) in regionChina that match the preference than regionIndia.

				st.MakePod().Name("p2").UID("p2").Namespace(v1.NamespaceDefault).Node("node2").Req(mediumRes).Obj(),
			},
			// even though node1 will fail with error but node2 will still be returned as a valid nominated node.
			nodes: []*v1.Node{
				st.MakeNode().Name("node1").Capacity(largeRes).Label("error", "true").Obj(),
				st.MakeNode().Name("node2").Capacity(largeRes).Obj(),
			},

            [
                taskMatcher("node1", ":producer:producer", []),
                transformStepMatcher("node2", expectedTransformId1, ["node1"]),
                transformStepMatcher("node3", expectedTransformId2, ["node1"]),
                taskMatcher("node4", ":consumer1:resolve", ["node2"]),
                taskMatcher("node5", ":consumer2:resolve", ["node3"]),
            ]
        )

			},
			lease:                   createNodeLease("node0", metav1.NewMicroTime(fakeNow.Time)),
			expectedRequestCount:    1, // List
			expectedNodes:           nil,
			expectedPodStatusUpdate: false,
		},
		// Node created long time ago, without status. Node lease is missing.
		// Expect Unknown status posted from node controller.
		{

				nodeInfos = append(nodeInfos, ni)
			}
			nodes, _ := nodesWherePreemptionMightHelp(nodeInfos, tt.nodesStatuses)
			if len(tt.expected) != len(nodes) {
				t.Errorf("number of nodes is not the same as expected. exptectd: %d, got: %d. Nodes: %v", len(tt.expected), len(nodes), nodes)
			}
			for _, node := range nodes {
				name := node.Node().Name
				if _, found := tt.expected[name]; !found {

		{User: node1, Decision: authorizer.DecisionAllow, Secret: "shared-all"},

		{User: node2, Decision: authorizer.DecisionNoOpinion, Secret: "node1-only"},
		{User: node2, Decision: authorizer.DecisionAllow, Secret: "node1-node2-only"},
		{User: node2, Decision: authorizer.DecisionAllow, Secret: "shared-all"},

		{User: node3, Decision: authorizer.DecisionNoOpinion, Secret: "node1-only"},

		},
		{
			pod: st.MakePod().Label("foo", "").Obj(),
			pods: []*v1.Pod{
				st.MakePod().Node("nodeA").Namespace(defaultNamespace).PodAntiAffinityExists("foo", "invalid-node-label", st.PodAntiAffinityWithRequiredReq).Obj(),
			},
			nodes: []*v1.Node{