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.
Recover overwritten Excel files. Excel 2010 and 2013 make it possible not only to restore the unsaved workbooks, but also to recover previous versions of your document. It is especially helpful when you make a mistake that you can't undo, or when you want to see how the document looked like a few minutes earlier.