Program: 56482
Project: 56482
Buggy source:
public void testInputDateObjectUS(Book book){
  Sheet sheet=book.getSheetAt(0);
  Range r;
  Date today=new Date();
  String todayStr, todayStrLong;
  Setup.setZssLocale(Locale.US);
  r=Ranges.range(sheet,"String_Node_Str");
  Assert.assertEquals("String_Node_Str",r.getCellStyle().getDataFormat());
  CellOperationUtil.applyDataFormat(r,"String_Node_Str");
  todayStr=Util.getDateFormat("String_Node_Str",Setup.getZssLocale()).format(today);
  todayStrLong=Util.getDateFormat("String_Node_Str",Setup.getZssLocale()).format(today);
  r.setCellEditText(todayStr);
  Assert.assertEquals("String_Node_Str",r.getCellStyle().getDataFormat());
  Assert.assertEquals(todayStr,r.getCellFormatText());
  Assert.assertEquals(CellType.NUMERIC,r.getCellData().getType());
  Assert.assertEquals(todayStr,r.getCellEditText());
  r.getCellData().setValue(today);
  Assert.assertEquals("String_Node_Str",r.getCellStyle().getDataFormat());
  Assert.assertEquals(todayStr,r.getCellFormatText());
  Assert.assertEquals(CellType.NUMERIC,r.getCellData().getType());
  Assert.assertEquals(todayStrLong,r.getCellEditText());
  r.getCellData().setValue(Util.getDateOnly(today));
  Assert.assertEquals("String_Node_Str",r.getCellStyle().getDataFormat());
  Assert.assertEquals(todayStr,r.getCellFormatText());
  Assert.assertEquals(CellType.NUMERIC,r.getCellData().getType());
  Assert.assertEquals(todayStr,r.getCellEditText());
  r.getCellData().setValue(Util.getDateOnly(today));
  Assert.assertEquals("String_Node_Str",r.getCellStyle().getDataFormat());
  Assert.assertEquals(todayStr,r.getCellFormatText());
  Assert.assertEquals(CellType.NUMERIC,r.getCellData().getType());
  Assert.assertEquals(todayStr,r.getCellEditText());
}

Fixed version (ground truth):
public void testInputDateObjectUS(Book book){
  Sheet sheet=book.getSheetAt(0);
  Range r;
  Date today=new Date();
  String todayStr, todayStrLong;
  Setup.setZssLocale(Locale.US);
  r=Ranges.range(sheet,"String_Node_Str");
  Assert.assertEquals("String_Node_Str",r.getCellDataFormat());
  CellOperationUtil.applyDataFormat(r,"String_Node_Str");
  todayStr=Util.getDateFormat("String_Node_Str",Setup.getZssLocale()).format(today);
  todayStrLong=Util.getDateFormat("String_Node_Str",Setup.getZssLocale()).format(today);
  r.setCellEditText(todayStr);
  Assert.assertEquals("String_Node_Str",r.getCellDataFormat());
  Assert.assertEquals(todayStr,r.getCellFormatText());
  Assert.assertEquals(CellType.NUMERIC,r.getCellData().getType());
  Assert.assertEquals(todayStr,r.getCellEditText());
  r.getCellData().setValue(today);
  Assert.assertEquals("String_Node_Str",r.getCellDataFormat());
  Assert.assertEquals(todayStr,r.getCellFormatText());
  Assert.assertEquals(CellType.NUMERIC,r.getCellData().getType());
  Assert.assertEquals(todayStrLong,r.getCellEditText());
  r.getCellData().setValue(Util.getDateOnly(today));
  Assert.assertEquals("String_Node_Str",r.getCellDataFormat());
  Assert.assertEquals(todayStr,r.getCellFormatText());
  Assert.assertEquals(CellType.NUMERIC,r.getCellData().getType());
  Assert.assertEquals(todayStr,r.getCellEditText());
  r.getCellData().setValue(Util.getDateOnly(today));
  Assert.assertEquals("String_Node_Str",r.getCellDataFormat());
  Assert.assertEquals(todayStr,r.getCellFormatText());
  Assert.assertEquals(CellType.NUMERIC,r.getCellData().getType());
  Assert.assertEquals(todayStr,r.getCellEditText());
}