[
  {
    "id": "$unset example",
    "stage": "$unset",
    "kind": "example",
    "pipeline": [
      {
        "$unset": [
          "internal",
          "address.secret"
        ]
      }
    ],
    "input": [
      {
        "name": "Pen",
        "internal": 1,
        "address": {
          "city": "Toronto",
          "secret": 2
        }
      }
    ],
    "result": [
      {
        "name": "Pen",
        "address": {
          "city": "Toronto"
        }
      }
    ]
  },
  {
    "id": "$unset empty input",
    "stage": "$unset",
    "kind": "empty input",
    "pipeline": [
      {
        "$unset": [
          "internal",
          "address.secret"
        ]
      }
    ],
    "input": [],
    "result": []
  },
  {
    "id": "$unset invalid specification",
    "stage": "$unset",
    "kind": "invalid specification",
    "pipeline": [
      {
        "$unset": null
      }
    ],
    "input": [
      {
        "name": "Pen",
        "internal": 1,
        "address": {
          "city": "Toronto",
          "secret": 2
        }
      }
    ],
    "error": "IllegalArgumentException",
    "message": "$unset stage requires a string or list of field names"
  },
  {
    "id": "$unset missing field",
    "stage": "$unset",
    "kind": "missing field",
    "pipeline": [
      {
        "$unset": "unknown"
      }
    ],
    "input": [
      {
        "name": "Pen"
      }
    ],
    "result": [
      {
        "name": "Pen"
      }
    ]
  }
]