Yes, Unit Testing is a type of White Box Testing because it focuses on testing individual components of a software application with knowledge of the internal code structure. White box testing involves analyzing the code, logic, and structure, which directly aligns with the objective of unit testing—validating the correctness of a specific function, method, or module in isolation.

Why is Unit Testing Considered White Box Testing?

• Code-Level Testing: Unit tests are written by developers who have access to the source code. The tests are designed based on internal logic, making them a white-box approach.
• Testing Internal Implementation: Unlike black-box testing, which focuses on external behavior, unit testing verifies how a specific piece of code works internally.
• Coverage of Code Paths: Unit tests check different code paths, such as loops, conditions, and exception handling, ensuring robust code coverage.
• Early Bug Detection: Since unit testing is performed at the development stage, it helps identify and fix defects before they reach later phases of testing.

Difference Between Unit Testing and Other White Box Testing Methods

While unit testing is a form of white box testing, other white-box techniques include:

• Integration Testing: Verifies how different modules interact.
• Mutation Testing: Evaluates the effectiveness of unit tests by modifying code and checking if tests detect the changes.
• Path Testing: Ensures all possible execution paths in a program are tested.