firestore/internal/conformance/testdata/update-paths-fp-empty.json

{
  "tests": [
    {
      "description": "update-paths: empty field path",
      "comment": "A FieldPath of length zero is invalid.",
      "updatePaths": {
        "docRefPath": "projects/projectID/databases/(default)/documents/C/d",
        "fieldPaths": [
          {
            "field": []
          }
        ],
        "jsonValues": [
          "1"
        ],
        "isError": true
      }
    }
  ]
}