}{
		{
			node: api.Node{
				ObjectMeta: metav1.ObjectMeta{Name: "foo1"},
				Status: api.NodeStatus{
					NodeInfo:  api.NodeSystemInfo{OSImage: "fake-os-image"},
					Addresses: []api.NodeAddress{{Type: api.NodeExternalIP, Address: "1.1.1.1"}},
				},
			},
			// Columns: Name, Status, Roles, Age, KubeletVersion, NodeInternalIP, NodeExternalIP, OSImage, KernelVersion, ContainerRuntimeVersion

					Conditions: []v1.NodeCondition{
						{
							Type:    v1.NodeReady,
							Status:  v1.ConditionTrue,
							Reason:  "Ready",
							Message: "Node ready",
						},
					},
					Addresses: []v1.NodeAddress{
						{
							Type:    v1.NodeInternalIP,
							Address: testKubeletHostIP,
						},
						{
							Type:    v1.NodeInternalIP,
							Address: testKubeletHostIPv6,
						},
					},

	// pods.
	mirrorPodClient kubepod.MirrorClient

	rootDirectory    string
	podLogsDirectory string

	lastObservedNodeAddressesMux sync.RWMutex
	lastObservedNodeAddresses    []v1.NodeAddress

	// onRepeatedHeartbeatFailure is called when a heartbeat operation fails more than once. optional.
	onRepeatedHeartbeatFailure func()