black box and white box testing

Difference between Black box testing and White box testing

In today’s digital world, we are surrounded by too many software’s. Hence, testing those software on a timely basis will help us identify defects and pin-point errors made during the development phase to deliver the best quality software to end-users.

Did you know software testing is a significant phase in Software Development Life Cycle (SDLC). It can be carried out either by manual or automation testing for the detection of bugs and errors in the software product.

There are almost 100 software testing types, existing in the field of software testing, for various purposes. In which, the most familiar type or method of software testing is the black box and white box testing.

To put in simple terms, Under “Black box testing”, we test the software from a user’s point of view i.e without checking the internal system code, but in “White box testing”, we check and test the actual internal code in the software.

Hence, to get a better insight into these types of testing. I come up with a topic “Difference between Black Box and White box testing“.

Parameter Black Box testing White box testing
Definition Black Box Testing is a type of software testing method in which the internal structure or the program or the code is hidden and nothing is known to the tester White Box Testing is a type of software testing method in which the internal structure or the code or the program of the software is known to the tester
Referred as outer or external software testing.   Inner or internal software testing
Alias It’s also known as data-driven, box testing,  opaque box, and functional testing It is also called structural testing, clear box testing, code-based testing, or glass box testing and  transparent box testing
Base of testing Testing is based on external expectations; the internal behavior of the application is unknown to the tester Testing is completely based on Internal codes and structures. the internal behavior of the application is known to the tester
Tested through software testers software developers
Usage This type of testing is applicable for higher levels of testing like System Testing, Acceptance testing This type of testing is applicable to lower level of testing like Unit Testing, Integration testing
Programming language Knowledge on programming language is not required to test the software. Knowledge on programming language is must required to perform the test.
Implementation knowledge No knowledge of implementation is required in black box testing Knowledge of implementation is required in white box testing
Automation Black box testing is  tough to automate. White Box testing is easy to automate.
Objective The main objective of black box testing is to check the functionality of the system under test The main objective of this testing is to check the quality of the code
Tested by Can be tested either by the end user, developer, and tester It is generally carried out by  testers and developers.
Basis for test cases This testing can be initiated after preparing requirement specification document. This type of testing of software is started after preparing for detail design document    
Granularity Low High
Testing method This is based on the trial and error method. Data domains along with internal boundaries can be better tested in white box testing    
Time It is less-time consuming to test and detect the bugs It takes more time to test and detect the bugs in the software
Algorithm test Not best suited for algorithm testing It is best preferable for algorithm testing
Type of testing It is the behavior testing of the software It is the logical testing of the software
Code Access In black box testing, the Code access is not required Code access is required for white box testing
Benefit It is well suited and efficient for large code segments It is suited for removing the extra lines of code, which can bring in hidden defects to the software
Tools Veracode, eclipse, Maven and so on. Selenium, Appium, Applitool and so on.  
Techniques Some test techniques include Boundary Value Analysis, Equivalence Partitioning, Error Guessing etc Some testing techniques include Conditional Testing, Data Flow Testing, Loop Testing etc
Types There are three types of testing including Functional Testing, Non-functional testing,  Regression Testing There are three types of testing including  Path Testing, loop testing and  condition testing  
Drawbacks If you want to modify the application frequently, then it is essential to update to automation test script Sometimes, the Automated test cases become useless if the code base is  changing frequently.


Today, when the demand of high quality software and applications is soaring rapidly, many number of students started to learn software testing course in order to take up all essential actions that required to improve the effectiveness, functionality, quality, and other aspects of the software.

And the best way to achieve the high quality software without any errors can be done through software testing. In which White box and black box testing are necessary for the successful software delivery.

If you want to learn in practical or want to build a career in this thriving industry. Choose a reputed software training institute and put through applicable hands-on software testing training modules and gain an in-depth knowledge in testing to deliver a high quality software product.

Author Bio:

Janani is working as a Content Manager at Zuan Education. She is keen to explore new and better avenues in software testing course. Her research-based content writings validate contemporary techniques that used in Software Testing. This in turn encourages Software testers. Also, It tempts new aspirants to join in a software testing institute to broaden their skills and knowledge through real-time practice.

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