{
  "label": "before: disk-full after charge",
  "first": {
    "screen": "retry",
    "error": "ENOSPC"
  },
  "second": {"screen": "success"},
  "charges": 2,
  "duplicateCharge": true
}
{
  "label": "after: disk-full after charge",
  "first": {
    "screen": "retry",
    "error": "ENOSPC"
  },
  "second": {"screen": "success"},
  "charges": 1,
  "duplicateCharge": false
}