Testing object-oriented systems models patterns and tools download

At the class level, every class should be tested as an individual entity. At this level, programmers who are involved in the development of class conduct the testing. Test cases can be drawn from requirements specifications, models, and the language used. In addition, structural testing methods such as boundary value analysis are extremely used. After performing the testing at class level, cluster level testing should be performed.

As classes are collaborated or integrated to form a small subsystem also known as cluster , testing each cluster individually is necessary. At this level, focus is on testing the components that execute concurrently as well as on the interclass interaction.

Hence, testing at this level may be viewed as integration testing where units to be integrated are classes. Once all the clusters in the system are tested, system level testing begins.

At this level, interaction among clusters is tested. Usually, there is a misconception that if individual classes are well designed and have proved to work in isolation, then there is no need to test the interactions between two or more classes when they are integrated. However, this is not true because sometimes there can be errors, which can be detected only through integration of classes.

Also, it is possible that if a class does not contain a bug, it may still be used in a wrong way by another class, leading to system failure. The methods used to design test cases in OO testing are based on the conventional methods. However, these test cases should encompass special features so that they can be used in the object-oriented environment.

The points that should be noted while developing test cases in an object-oriented environment are listed below. As many organizations are currently using or targeting to switch to the OO paradigm, the importance of OO software testing is increasing. The methods used for performing object-oriented testing are discussed in this section.

State-based testing is used to verify whether the methods a procedure that is executed by an object of a class are interacting properly with each other. This testing seeks to exercise the transitions among the states of objects based upon the identified inputs. For this testing, finite-state machine FSM or state-transition diagram representing the possible states of the object and how state transition occurs is built.

In addition, state-based testing generates test cases, which check whether the method is able to change the state of object as expected.

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