[
  {
    "id": "$sort example",
    "stage": "$sort",
    "kind": "example",
    "pipeline": [
      {
        "$sort": {
          "score": -1,
          "name": 1
        }
      }
    ],
    "input": [
      {
        "name": "B",
        "score": 2
      },
      {
        "name": "A",
        "score": 3
      }
    ],
    "result": [
      {
        "name": "A",
        "score": 3
      },
      {
        "name": "B",
        "score": 2
      }
    ]
  },
  {
    "id": "$sort empty input",
    "stage": "$sort",
    "kind": "empty input",
    "pipeline": [
      {
        "$sort": {
          "score": -1,
          "name": 1
        }
      }
    ],
    "input": [],
    "result": []
  },
  {
    "id": "$sort invalid specification",
    "stage": "$sort",
    "kind": "invalid specification",
    "pipeline": [
      {
        "$sort": null
      }
    ],
    "input": [
      {
        "name": "B",
        "score": 2
      },
      {
        "name": "A",
        "score": 3
      }
    ],
    "error": "IllegalArgumentException",
    "message": "$sort expects an object with sort keys"
  },
  {
    "id": "$sort invalid direction",
    "stage": "$sort",
    "kind": "invalid direction",
    "pipeline": [
      {
        "$sort": {
          "score": 0
        }
      }
    ],
    "input": [
      {
        "score": 1
      },
      {
        "score": 2
      }
    ],
    "error": "IllegalArgumentException",
    "message": "$sort direction must be 1 or -1: 0"
  },
  {
    "id": "$sort null and missing",
    "stage": "$sort",
    "kind": "null and missing",
    "pipeline": [
      {
        "$sort": {
          "score": 1
        }
      }
    ],
    "input": [
      {
        "score": 2
      },
      {
        "score": null
      },
      {}
    ],
    "result": [
      {
        "score": null
      },
      {},
      {
        "score": 2
      }
    ]
  }
]