firestore/internal/conformance/testdata/update-paths-del.json

{
  "tests": [
    {
      "description": "update-paths: Delete",
      "comment": "If a field's value is the Delete sentinel, then it doesn't appear\nin the update data, but does in the mask.",
      "updatePaths": {
        "docRefPath": "projects/projectID/databases/(default)/documents/C/d",
        "fieldPaths": [
          {
            "field": [
              "a"
            ]
          },
          {
            "field": [
              "b"
            ]
          }
        ],
        "jsonValues": [
          "1",
          "\"Delete\""
        ],
        "request": {
          "database": "projects/projectID/databases/(default)",
          "writes": [
            {
              "update": {
                "name": "projects/projectID/databases/(default)/documents/C/d",
                "fields": {
                  "a": {
                    "integerValue": "1"
                  }
                }
              },
              "updateMask": {
                "fieldPaths": [
                  "a",
                  "b"
                ]
              },
              "currentDocument": {
                "exists": true
              }
            }
          ]
        }
      }
    }
  ]
}