WHITE BOX TESTING VERSUS BLACK BOX TESTING

In previous posts we discuss a lot about testing, types of testing extra but here we are going to discuss something which is very important for every novel software tester, as this is the most asked question in a software testing interview.

Before discussing the difference points let's quickly understand what is black box testing and what is white box testing??

White box testing is that type of software testing in which the inner structure is clearly known to the software tester. It is also called transparent testing.
Whereas black box testing is that type of software testing in which the internal structure or code is not known to the software tester.

SR. NO&CRITERIA	WHITE BOX TESTING	BLACK BOX TESTING
1.Definition	White box testing is a kind of testing in which internal structure, design or implementation of the product or software is well known to the software tester	Black box testing is a kind of testing in which the internal structure, design or implementation is clearly known to the software tester
2.Performed by	White box testing is performed by the software developers	Black box testing is carried out by software testers
3.Applicable To	Mainly applicable to lower level of testing viz Unit Testing, Integration Testing.	Mainly applicable to higher level of testing viz Acceptance Testing, System Testing
4.Implementation Knowledge	Required	Not Required
5.Responsibility	Software developers are responsible	Software testers are responsible
6.Basis for Test Cases	Detail Design	Requirement Specification
7.Means	White box Testing actually means structural testing or interior testing	Black box testing actually means functional testing or external testing
8.Main aim	The main aim of white box testing is to check how system is performing	The main aim of black box testing is that what functionality is being testing by system under test cases

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