{
    "description": "Connect to RSPrimary", 
    "phases": [
        {
            "outcome": {
                "servers": {
                    "a:27017": {
                        "setName": "rs", 
                        "type": "RSPrimary"
                    }
                }, 
                "setName": null, 
                "topologyType": "Single"
            }, 
            "responses": [
                [
                    "a:27017", 
                    {
                        "hosts": [
                            "a:27017"
                        ], 
                        "ismaster": true, 
                        "ok": 1, 
                        "setName": "rs"
                    }
                ]
            ]
        }
    ], 
    "uri": "mongodb://a"
}