func getJsonData(conf agentConf) map[string]*dataStruct {
	dockerService := &services.DockerService{Url: conf.DockerUrl}
	cgroupService := &services.CgroupService{DockerPrefix: conf.CgroupDockerPrefix}
	containersMap := containers.List(dockerService.List)
	name2Id := make(map[string]string, 0)
	data := make(map[string]*dataStruct)
	for id, names := range containersMap {
		data[id] = &dataStruct{}
		data[id].Info = containers.Grab(dockerService.Inspect, id)
		name2Id[data[id].Info.Name] = id
		for i := 0; i < len(names); i++ {
			name := names[i]
			if strings.LastIndex(name, "/") > 0 {
				parent := strings.Split(name, "/")
				data[id].Info.Parents = append(data[id].Info.Parents, parent[1])
			}
		}
		if data[id].Info.Running {
			data[id].Memory = memoryMetrics.Grab(cgroupService.GetMemLines, id)
			data[id].Cpu = cpuMetrics.Grab(cgroupService.GetCpuLines, id)
			data[id].Network = networkMetrics.Grab(cgroupService.GetNetworkLines, id)
		}
	}
	for _, value := range data {
		if value.Info.Parents != nil {
			for i := 0; i < len(value.Info.Parents); i++ {
				parentId := name2Id[value.Info.Parents[i]]
				data[parentId].Info.Children = append(data[parentId].Info.Children, value.Info.Name)
			}
		}
	}
	return data
}
func TestGrabOneContainer(t *testing.T) {
	fakeDataSource := func(containerId string) []byte {
		response := `{
		   "ID" : "2a1f22565121fdaf1f43da2afc2e5495773953c57b01fd58f9be63caaa30f477",
		   "Created" : "2014-04-22T07:56:24.239219361Z",
		   "Image" : "724de0535b4f4b087dd78ad502744d5872629d78f7bea3a212bf702355bb7b3d",
		   "VolumesRW" : {},
		   "Volumes" : {},
		   "ExecDriver" : "native-0.1",
		   "Driver" : "aufs",
		   "Args" : [],
		   "HostnamePath" : "/home/docker/containers/2a1f22565121fdaf1f43da2afc2e5495773953c57b01fd58f9be63caaa30f477/hostname",
		   "NetworkSettings" : {
			  "PortMapping" : null,
			  "IPPrefixLen" : 16,
			  "Ports" : {
				 "28017/tcp" : null,
				 "27017/tcp" : [ { "HostIp" : "0.0.0.0", "HostPort" : "27017" } ]
			  },
			  "Bridge" : "docker0",
			  "Gateway" : "172.17.42.1",
			  "IPAddress" : "172.17.0.2"
		   },
		   "HostsPath" : "/home/docker/containers/2a1f22565121fdaf1f43da2afc2e5495773953c57b01fd58f9be63caaa30f477/hosts",
		   "HostConfig" : {
			  "PortBindings" : {
				 "28017/tcp" : null,
				 "27017/tcp" : [ { "HostPort" : "27017", "HostIp" : "0.0.0.0" } ]
			  },
			  "NetworkMode" : "",
			  "PublishAllPorts" : false,
			  "Privileged" : false,
			  "Links" : null,
			  "VolumesFrom" : null,
			  "Dns" : null,
			  "DnsSearch" : null,
			  "ContainerIDFile" : "",
			  "LxcConf" : [],
			  "Binds" : null
		   },
		   "Name" : "/mongodb",
		   "Path" : "mongod",
		   "ProcessLabel" : "",
		   "State" : {
			  "Pid" : 11680,
			  "StartedAt" : "2014-06-02T19:24:52.022935883Z",
			  "ExitCode" : 0,
			  "Running" : true,
			  "FinishedAt" : "2014-06-02T07:49:05.376035878Z"
		   },
		   "MountLabel" : "",
		   "Config" : {
			  "Domainname" : "",
			  "NetworkDisabled" : false,
			  "Hostname" : "2a1f22565121",
			  "OpenStdin" : false,
			  "Tty" : false,
			  "CpuShares" : 0,
			  "MemorySwap" : 0,
			  "StdinOnce" : false,
			  "Env" : null,
			  "Volumes" : null,
			  "Image" : "bacongobbler/mongodb",
			  "AttachStderr" : false,
			  "Memory" : 0,
			  "OnBuild" : null,
			  "PortSpecs" : null,
			  "User" : "",
			  "WorkingDir" : "",
			  "ExposedPorts" : {
				 "28017/tcp" : {},
				 "27017/tcp" : {}
			  },
			  "AttachStdout" : false,
			  "Entrypoint" : null,
			  "Cmd" : [ "mongod" ],
			  "AttachStdin" : false
		   },
		   "ResolvConfPath" : "/etc/resolv.conf"
		}`
		return []byte(response)
	}

	container := containers.Grab(fakeDataSource, "FOO")

	assert.True(t, container.Running)
	assert.Equal(t, container.Pid, 11680)
	refDate, _ := time.Parse(time.RFC3339, "2014-06-02T19:24:52.022935883Z")
	refUptime := int64(time.Since(refDate).Seconds())
	assert.Equal(t, container.Uptime, refUptime)
	assert.Equal(t, container.Image, "724de0535b4f4b087dd78ad502744d5872629d78f7bea3a212bf702355bb7b3d")
	assert.Equal(t, container.Name, "mongodb")
	assert.Equal(t, container.IPAddress, "172.17.0.2")
	assert.NotEmpty(t, container.Ports)
	assert.Equal(t, len(container.Ports), 2)
	firstPort := container.Ports[0]
	assert.Equal(t, firstPort.ContainerPort, "28017/tcp")
	assert.Equal(t, firstPort.HostIp, "")
	assert.Equal(t, firstPort.HostPort, "")
	secondPort := container.Ports[1]
	assert.Equal(t, secondPort.ContainerPort, "27017/tcp")
	assert.Equal(t, secondPort.HostIp, "0.0.0.0")
	assert.Equal(t, secondPort.HostPort, "27017")
}