Reducing Error in Software by Making Software Testable

This paper is an attempt to introduce automated testing as a way for reducing software error, and then mention the structure and design which software should possess in order to makes it testable.Considering the fact that the softwares are usually designed so that they do not have the necessary properties for software testability, we mention three important principles that by exerting them on software design structure and coding, software is made testable. This is indicated with a simple and applied example.Finally, we deal with an important aspect of automated testing, that is, Automated testing of classes dependent on other classes. Automated testing of dependent tests without having necessary classes is among important aspects in Automated testing which have value and advantage of parallel implementation process in software development. Important principle of dependency injection is well-used. Automated testing of a class dependent on other classes without using the necessary required real class and by using mock objects will be described through a simple and expressive example.

Keywords:

Automated Testing , Unit Test , Loos Coupling , Dependency Inversion , Dependency Injection , Mock Objects