src/chromiumos/test/execution/data/companions.json

{
    "test_suites" : [
        {
            "name" : "suite1",
            "test_case_ids" : {
                "test_case_ids" : [
                    {
                        "value" : "tast.meta.CompanionDUTs"
                    }
                ]
            }
        }
    ],
    "primary":{
            "dut":{
                "id":{"value":"primary_dut"},
                "chromeos":{
                    "ssh":{
                        "address":"127.0.0.1",
                        "port":2222
                   }
                }
            }
        },
    "companions":[
        {
            "dut": {
                "id": {"value":"CompanionDut1"},
                "chromeos": {
                    "ssh":{
                        "address":"127.0.0.1",
                        "port":2223
                   }
                }
            }
        }
    ]
}