{
  "tests": [
    {
      "description": "update-paths: Exists precondition is invalid",
      "comment": "The Update method does not support an explicit exists precondition.",
      "updatePaths": {
        "docRefPath": "projects/projectID/databases/(default)/documents/C/d",
        "precondition": {
          "exists": true
        },
        "fieldPaths": [
          {
            "field": [
              "a"
            ]
          }
        ],
        "jsonValues": [
          "1"
        ],
        "isError": true
      }
    }
  ]
}