Difference Between Black Box Testing and White Box Testing

By BYJU'S Exam Prep

Updated on: September 25th, 2023

Difference between Black Box Testing and White Box Testing can be understood by driving through the details given in this post. The technique that examines the functionality of the software without taking knowledge of its internal structure or coding is called Black Box Testing. On the other hand, White-box testing examines the internal workings system.

Difference between Black Box Testing and White Box Testing

Black Box Testing

White Box Testing

No knowledge of implementation is necessary.

Knowledge of implementation is necessary.

It can be referred to as the outer or external software testing method.

It is the inner or the internal software testing method.

This test is a functional test of the software.

This test is a structural test of the software.

It can be initiated on the basis of the requirement specifications document.

It is started after a detailed design document.

No knowledge of programming is mandatory.

Knowledge of programming is mandatory.

It is the behaviour testing of the software.

It is the logic testing of the software.

This testing is higher levels of software testing.

This testing is applicable to the lower levels of software testing.

Example: Searching something on google by using keywords.

Example: By input to check and verify loops.

Difference Between Black Box Testing and White Box Testing

The crucial differences between Black Box Testing and White Box Testing have been discussed above. In Black Box Testing, only the external design and structure are tested whereas in White Box Testing implementation and impact of the code are tested.

We can also learn about the difference between testing and debugging in order to know more about testing.

Black Box Testing vs White Box Testing

Black-box testing is a high level of testing that focuses on the behaviour of the working software. White-box testing is a technique that checks the internal functioning of the given system. Check out the difference between Black-box testing and White-box testing below:

Black Box Testing

  • The programming code of the software is hidden and nothing is known about it.
  • In this, a programmer/tester does not have any knowledge about the internal working system of software.
  • It is mostly done by software testers.
  • It involves testing from an end-user perspective. 
  • It can be enforced to virtually every level of software testing: system, unit, integration, and acceptance.
  • Black-box testing is also called closed testing.
  • Types of Black Box Testing are Functional Testing, Non-functional testing, and Regression Testing.
  • It is not suitable for algorithm testing and it can be done by trial, error ways, and methods.

White Box Testing

  • The programmer or tester must have knowledge about the internal programming code of the software.
  • It is based on the coverage of code statements, branches, and conditions.
  • It is mostly done by developers.
  • It is considered to be low-level testing.
  • It is also known as clear box, glass box, and transparent box testing.
  • It considers that the path of the logic in a program is known already.
  • Types of White Box Testing are Path Testing, Loop Testing, and Condition testing.
  • It is suitable for algorithm testing and domains of data along with inner boundaries can be better tested.

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