{
  "description": "Should fail to insert a field",
  "skip": false,
  "validationOptions": { "fields": false },
  "input": {
    "leader": "02848ccm a22005894i 4500",
    "fields": []
  },
  "operations": [
    { "name": "insertField", "args": {"tag": "001"}}
  ],
  "throws": "Field is invalid",
  "immutable": true
}