public final void testRemoveArrayFormula() {
Workbook workbook = _testDataProvider.createWorkbook();
Sheet sheet = workbook.createSheet();
CellRangeAddress range = new CellRangeAddress(3, 5, 2, 2);
assertEquals("C4:C6", range.formatAsString());
CellRange<?> cr = sheet.setArrayFormula("SUM(A1:A3*B1:B3)", range);
assertEquals(3, cr.size());
// remove the formula cells in C4:C6
CellRange<?> dcells = sheet.removeArrayFormula(cr.getTopLeftCell());