Customer Reviews

Testing Object-Oriented Software: Life-Cycle Solutions

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This book's author scrutinized the software testing in a totally different way from most software testing books. The author focused on modern OO software testing, mainly glass box testing. It is very helpful, because it covers some important changes for OO system testing, which are not included in most software testing books.

Here are some points that impressed me most:

1) Information Hiding and Abstraction: Although information hiding brings many benefits to programmers, it may be a strain on the life of a software tester. To test a method, if a tester wants to check the state of an object before and after the invocation of the method, he needs to access the internal state or data of that object. However, it is hidden to testers. Abstraction separates the essential behavior of an object form its implementation. An object can be tested as a black box using the abstraction of the object.

2) Testability of Object-Oriented Systems: The author's definition of testability is a prediction of the probability of software failure occurring due to the existence of a fault. The definition implies the software testability is related to the ability of software to hide faults for a selected input distribution. Obviously, OO system's testability is lower than procedural counterpart.

3) More opportunities for testers: Object orientation is employed to improve productivity and efficiency. Higher-complexity software is being produced in less time. This increased complexity is conducive to more error opportunities in novel ways. - Hai Huang