Difference between Black Box Testing and White Box Testing

Testing is the preceding step of software development life cycle before the software is delivered to the client. In testing phase the customer satisfaction and quality is tested. A team is present in every software house which performs these testing. There are many techniques for performing testing.  But there are only three basics of performing testing which involve white box testing, black box testing. Techniques involved in testing are unit, regression and system testing.

Black Box Testing

In black box testing the external behavior of the system is tested. In black box testing the internal working is totally ignored just the outer behavior is monitored. In black box testing no test cases are made just the outer behavior is considered. In black box testing the user satisfaction and quality is checked.

White Box Testing

In white box testing the internal behavior of the software is testing. It is related with the code written. In this type of testing the errors and bugs found in source code and are removed. In white box testing the requirement and quality is not tested.

Black Box Testing VS White Box Testing

Characterization:

In black box the user satisfaction level is tested. And it is related with the outputs that are generated by number of inputs.

In white box testing the code that is written by the developer is tested and all the errors are removed.

Level of testing:

It can be done at any level or stage or software development life cycle.

White box testing is done at unit testing level. In which small pieces of code is tested.

Performed by:

Black box testing is performed by the testing team whom are responsible for performing testing.

White box testing is done by the developer or programmer because if it is performed by testing team more time is consumed in understanding the code as well as in understanding logic.

Functions to be tested:

In black box testing the test team tests ease of use, overall system, and user satisfaction and acceptance level.

In white box testing performance, security, capacity is tested.

Synonyms:

It is also known as functional testing.

It is also called as glass box testing.

Level of concerns:

In performing black box testing the functional and non-functional requirements are tested.

In performing white box testing the internal behavior and sub-routines are tested.

Conclusion

White and black box have pons and cons. Both they both are mandatory before the product is delivered to the client. As they both are considered as an important phase of the software development life cycle.