Use of Drivers and Stubs

A driver module is used to simulate a calling module and call the program unit being tested by passing input arguments. The driver can be written in various ways, (e.g., prompt interactively for the input arguments or accept input arguments from a file).

To test the ability of the unit being tested to call another module, it may be necessary to use a different temporary module, called a stub module. More than one stub may be needed, depending on the number of programs the unit calls. The stub can be written in various ways, (e.g., return control immediately or return a message that indicates it was called and report the input parameters received).