public void testGetActiveCell() {
Workbook workbook = new XSSFWorkbook();
CTSheet ctSheet = CTSheet.Factory.newInstance();
CTWorksheet ctWorksheet = CTWorksheet.Factory.newInstance();
XSSFSheet sheet = new XSSFSheet(ctSheet, ctWorksheet, (XSSFWorkbook) workbook);
ctWorksheet.addNewSheetViews().addNewSheetView().addNewSelection().setActiveCell("R5");
assertEquals("R5", sheet.getActiveCell());
}