public static int TestGetRanges(string formula)
{
// mock workbook object
var mwb = new MockWorkbook();
Excel.Workbook wb = mwb.GetWorkbook();
Excel.Worksheet ws = mwb.GetWorksheet(1);
var path = Microsoft.FSharp.Core.FSharpOption<string>.None;
var ranges = ExcelParserUtility.GetRangeReferencesFromFormulaRaw(formula, path, wb, ws, ignore_parse_errors: false);
return ranges.Count();
}