What is White Box testing? Who is responsible for white box testing?

What is White Box testing?

White box testing strategy deals with the internal logic and structure of the code. White box testing is also called as glass, structural, open box or clear box testing. The tests written based on the white box testing strategy incorporate coverage of the code written, branches, paths, statements and internal logic of the code etc.

In order to implement white box testing, the tester has to deal with the code and hence is needed to possess knowledge of coding and logic i.e. internal working of the code. White box test also needs the

Tester to look into the code and find out which unit/statement/chunk of the code is malfunctioning.

Unit Testing

Testing of Individual Unit (E.g. : Function, Program, Module)

1.       Also referred to as White Box Testing

2.       Typically performed by the Developer

3.       Goal of Unit testing is to uncover defects using formal techniques like:

•  Resource-behavior (e.g. memory leaks), performance or robustness testing, as well as structural testing
• Defects and deviations in Date formats
• Special requirements in input conditions (for example Text box where only numeric or alphabets should be entered)
• Selection based on Combo Box’s, List Box’s, Option buttons, Check Box’s
• Testing occurs with access to the code being tested, with the support of the development environment, such as a unit test framework or debugging tool.

4.       The testing must ensure:

• Statement Coverage
• Branch Coverage
• Condition Coverage
• Exceptional Conditions Coverage

5.       Tools that can be used:

• Junit, JTest Case, Cactus, Jindent, Rational Quantifier, Rational Purifier

 Who is responsible for white box testing?

It depends on the process and the associated stakeholders of the project(s). In the IT

Industry, large companies have a team with responsibilities to evaluate the developed software in the context of the given requirements. Moreover, developers also conduct testing which is called Unit Testing. In most cases, following professionals are involved in testing of a system within their respective capacities:

• Software Tester
• Software Developer

Different companies have different designations for people who test the software on the basis of their experience and knowledge such as Software Tester, Software Quality Assurance Engineer, and QA Analyst etc. 

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