{
  "tests": [
    {
      "description": "update: ArrayUnion with data",
      "comment": "A key with ArrayUnion is removed from the fields in the update \noperation. Instead it appears in update transforms",
      "update": {
        "docRefPath": "projects/projectID/databases/(default)/documents/C/d",
        "jsonData": "{\"a\": 1, \"b\": [\"ArrayUnion\", 1, 2, 3]}",
        "request": {
          "database": "projects/projectID/databases/(default)",
          "writes": [
            {
              "update": {
                "name": "projects/projectID/databases/(default)/documents/C/d",
                "fields": {
                  "a": {
                    "integerValue": "1"
                  }
                }
              },
              "updateMask": {
                "fieldPaths": [
                  "a"
                ]
              },
              "updateTransforms": [
                {
                  "fieldPath": "b",
                  "appendMissingElements": {
                    "values": [
                      {
                        "integerValue": "1"
                      },
                      {
                        "integerValue": "2"
                      },
                      {
                        "integerValue": "3"
                      }
                    ]
                  }
                }
              ],
              "currentDocument": {
                "exists": true
              }
            }
          ]
        }
      }
    }
  ]
}