### Question:
ParseString implements IsParser<String> { @Override public void setCell(String o, Cell cell, Field field) { if (o != null) { cell.setCellValue(o); } }  @Override String parse(Object o, Field field); @Override void setCell(String o, Cell cell, Field field);  }### Answer:
@Test public void setCell() throws Exception { Cell cell = CellGenerateUtil.create(); parseString.setCell(null, cell, null); assertEquals("", cell.getStringCellValue()); parseString.setCell(expected, cell, null); assertEquals(expected, cell.getStringCellValue()); }