I'm trying to modify one of the subroutines that is used to decipher a particular type of csv file out of an entire project of vba macro subroutines. I may be a bit vague here, but I'm not too sure how to test my modified subroutine while keeping the rest of the project's codes relatively intact as the code that I'm working on involves instantiating a class object defined in the original class module code in the project. Should I be coding the subroutine that reads the csv file independently on a separate excel workbook macro?