{
  "tests": [
    {
      "description": "set-merge: If no ordinary values in Merge, no write",
      "comment": "If all the fields in the merge option have ServerTimestamp\nvalues, then no update operation is produced, only a transform.",
      "set": {
        "docRefPath": "projects/projectID/databases/(default)/documents/C/d",
        "option": {
          "fields": [
            {
              "field": [
                "b"
              ]
            }
          ]
        },
        "jsonData": "{\"a\": 1, \"b\": \"ServerTimestamp\"}",
        "request": {
          "database": "projects/projectID/databases/(default)",
          "writes": [
            {
              "transform": {
                "document": "projects/projectID/databases/(default)/documents/C/d",
                "fieldTransforms": [
                  {
                    "fieldPath": "b",
                    "setToServerValue": "REQUEST_TIME"
                  }
                ]
              }
            }
          ]
        }
      }
    }
  ]
}