firestore/internal/conformance/testdata/query-arrayunion-where.json

{
  "tests": [
    {
      "description": "query: ArrayUnion in Where",
      "comment": "ArrayUnion is not permitted in queries.",
      "query": {
        "collPath": "projects/projectID/databases/(default)/documents/C",
        "clauses": [
          {
            "where": {
              "path": {
                "field": [
                  "a"
                ]
              },
              "op": "==",
              "jsonValue": "[\"ArrayUnion\", 1, 2, 3]"
            }
          }
        ],
        "isError": true
      }
    }
  ]
}