{
  "tests": [
    {
      "description": "update: ServerTimestamp beside an empty map",
      "comment": "When a ServerTimestamp and a map both reside inside a map, the\nServerTimestamp should be stripped out but the empty map should remain.",
      "update": {
        "docRefPath": "projects/projectID/databases/(default)/documents/C/d",
        "jsonData": "{\"a\": {\"b\": {}, \"c\": \"ServerTimestamp\"}}",
        "request": {
          "database": "projects/projectID/databases/(default)",
          "writes": [
            {
              "update": {
                "name": "projects/projectID/databases/(default)/documents/C/d",
                "fields": {
                  "a": {
                    "mapValue": {
                      "fields": {
                        "b": {
                          "mapValue": {
                            "fields": {}
                          }
                        }
                      }
                    }
                  }
                }
              },
              "updateMask": {
                "fieldPaths": [
                  "a"
                ]
              },
              "currentDocument": {
                "exists": true
              }
            },
            {
              "transform": {
                "document": "projects/projectID/databases/(default)/documents/C/d",
                "fieldTransforms": [
                  {
                    "fieldPath": "a.c",
                    "setToServerValue": "REQUEST_TIME"
                  }
                ]
              }
            }
          ]
        }
      }
    }
  ]
}