The testing team follows Software Testing Life Cycle (STLC) which is similar to the development cycle followed by the development team. There are following six phases in every Software development life cycle model: Requirement gathering and analysis. Design.
If you simply deleted an XLS file, DiskInternals Excel Recovery will look up the file system to find all XLS files that were deleted recently, and test each file for the possibility of successful recovery.
If you delete, lose, save over, or do not save a Microsoft Office Excel 2007 or Microsoft Office Excel 2003 workbook, you may be able to recover it. Excel has an AutoRecover feature that automatically saves workbooks when you have an accidental loss of power or similar problems.