public void AddWorkSheetsTest() { ExcelManager manager = new ExcelManager(); manager.AddWorkSheets(new StringList { "Worksheet1", "Worksheet2" }, ExcelFile); try { //try to go on new worksheets manager.ChangeCellValue(ExcelFile, "Worksheet1", "A1", "Test"); manager.ChangeCellValue(ExcelFile, "Worksheet2", "A1", "Test"); } catch { Assert.Fail(); } }