What Is Different about Testing Object-Oriented Software?
Object-oriented programming features in programming languages obviously impact some aspects of testing. Features such as class inheritance and interfaces support polymorphism in which code manipulates objects without their exact class being known. Testers must ensure the code works no matter what the exact class of such objects might be. Language features that support and enforce data hiding can complicate testing because operations must sometimes be added to a class interface just to support testing. On the other hand, the availability of these features can contribute to better and reusable testing software. Not only do changes in programming languages affect testing, but so do changes in the development process and changes in the focus of analysis and design. Many object-oriented software-testing activities have counterparts in traditional processes. We still have a use for unit testing although the meaning of unit has changed. We still do integration testing to make sure various sub
