{
  "tests": [
    {
      "description": "set: The ServerTimestamp sentinel cannot be in an ArrayUnion",
      "comment": "The ServerTimestamp sentinel must be the value of a field. It may\nnot appear in an ArrayUnion.",
      "set": {
        "docRefPath": "projects/projectID/databases/(default)/documents/C/d",
        "jsonData": "{\"a\": [\"ArrayUnion\", 1, \"ServerTimestamp\", 3]}",
        "isError": true
      }
    }
  ]
}