private static IWorkbook LoadWorkbook(string path)
        {
            if (!ImportUtils.IsExcelFile(path))
            {
                throw new ArgumentException($"Not an Excel file: {path}");
            }

            IWorkbook workbook;

            using (var stream = File.Open(path, FileMode.Open, FileAccess.Read))
            {
                workbook = new XSSFWorkbook(stream);
            }

            return(workbook);
        }
        public void ShouldRecognizeExcelFiles(string filePath, bool expected)
        {
            var actual = ImportUtils.IsExcelFile(filePath);

            Assert.AreEqual(expected, actual);
        }