Difference Between White Box and Black Box Testing
Difference Between White Box and Black Box Software Testing
Black Box Testing is a software testing method in which the internal structure/ design/ implementation of the item being tested is not known to the tester but in case of White Box Testing is a software testing method in which the internal structure/ design/ implementation of the item being tested is known to the tester.
White Box testing: White-box testing is a testing technique which checks the internal functioning of the system. In this method, testing is based on coverage of code statements, branches, paths or conditions. White-Box testing is considered as low-level testing. It is also called glass box, transparent box, clear box or code base testing. The white-box Testing method assumes that the path of the logic in a unit or program is known.
Black Box testing: In Black-box testing, a tester doesn't have any information about the internal working of the software system. Black box testing is a high level of testing that focuses on the behavior of the software. It involves testing from an external or end-user perspective. Black box testing can be applied to virtually every level of software testing: unit, integration, system, and acceptance.
| Parameter | Black Box Testing | White Box Testing |
|---|---|---|
| Definitio | It is a testing approach which is used to test the software without the knowledge of the internal structure of program or application. | It is a testing approach in which internal structure is known to the tester. |
| Alias | It also knowns as data-driven, box testing, data-, and functional testing. | It is also called structural testing, clear box testing, code-based testing, or glass box testing. |
| Base of Testing | Testing is based on external expectations; internal behavior of the application is unknown. | Internal working is known, and the tester can test accordingly. |
| Usage | This type of testing is ideal for higher levels of testing like System Testing, Acceptance testing. | Testing is best suited for a lower level of testing like Unit Testing, Integration testing. |
| Programming knowledge | Programming knowledge is not needed to perform Black Box testing. | Programming knowledge is required to perform White Box testing. |
| Implementation knowledge | Implementation knowledge is not requiring doing Black Box testing. | Complete understanding needs to implement WhiteBox testing. |
| Automation | Test and programmer are dependent on each other, so it is tough to automate. | White Box testing is easy to automate. |
| Objective | The main objective of this testing is to check what functionality of the system under test. | The main objective of White Box testing is done to check the quality of the code. |
| Basis for test cases | Testing can start after preparing requirement specification document. | Testing can start after preparing for Detail design document. |
| Time | It is less exhaustive and time-consuming. | Exhaustive and time-consuming method. |
| Code Access | Code access is not required for Black Box Testing. | White box testing requires code access. Thereby, the code could be stolen if testing is outsourced. |