What Is the Difference between White Box Testing and Black Box Testing?

Out of the multiple software testing techniques, methods, and processes, two of the most prominent ones are White Box Testing and Black Box Testing.

What is White Box Testing

This testing methodology enables a tester (software developers, in general) to look into the internal structure and sub-system of an application while testing. It provides a degree of sophistication and freedom to a tester, allowing him/her to interact with an application’s objects and not only just the interface. Some of the techniques of white-box testing include statement coverage, decision coverage, condition coverage, decision/condition coverage, and multiple condition coverage.

What is Black Box Testing

In this method, a tester tests the software without having access to the internal structure or code of an application/program/software. He/she only looks at the available inputs and the expected output from each input. Some of the techniques of black-box testing are boundary value analysis, equivalence class partitioning, decision table-based testing, cause-effect graphing technique, and error guessing.

A tabular representation of the differences between white-box testing and black-box testing is displayed below:

In conclusion, both white box testing and black box testing have their own unique features, advantages, and disadvantages. Both methods address particular non-redundant needs, and in that respect, they should be employed in a complementary manner to be assured of the comprehensiveness of the software testing process.