public void AutoSizeColumn_trackAllColumns() { workbook = new SXSSFWorkbook(); sheet = workbook.CreateSheet() as SXSSFSheet; sheet.TrackAllColumnsForAutoSizing(); sheet.AutoSizeColumn(0, useMergedCells); sheet.UntrackAllColumnsForAutoSizing(); try { sheet.AutoSizeColumn(0, useMergedCells); Assert.Fail("Should not be able to auto-size an implicitly untracked column"); } catch (InvalidOperationException) { // expected } }