Unit Testing:  testdata/failing.yml
  FAILED:
    alertname:InstanceDown, time:1d,
        exp:[
            0:
              Labels:{alertname="InstanceDown", instance="localhost:9090", job="prometheus", severity="page"}
              Annotations:{description="localhost:9090 of job prometheus has been down for more than 5 minutes.", summary="Instance localhost:9090 down"}
            ],
        got:[
            0:
              Labels:{alertname="InstanceDown", instance="localhost:9090", job="alertmanager", severity="page"}
              Annotations:{description="localhost:9090 of job alertmanager has been down for more than 5 minutes.", summary="Instance localhost:9090 down"},
            1:
              Labels:{alertname="InstanceDown", instance="localhost:9090", job="prometheus", severity="page"}
              Annotations:{description="localhost:9090 of job prometheus has been down for more than 5 minutes.", summary="Instance localhost:9090 down"}
            ]
    expr: "count(ALERTS) by (alertname, alertstate)", time: 4m,
        exp: {alertname="InstanceDown", alertstate="firing"} 1E+00
        got: {alertname="InstanceDown", alertstate="pending"} 3E+00