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What is black box testing? What are the different black box testing techniques?

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posted Mar 6 by Suresh Babu

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BLACK BOX TESTING, also known as Behavioral Testing, is a software testing method in which the internal structure/design/implementation of the item being tested is not known to the tester. These tests can be functional or non-functional, though usually functional.

black box testing image

This method is named so because the software program, in the eyes of the tester, is like a black box; inside which one cannot see. This method attempts to find errors in the following categories:

Incorrect or missing functions
Interface errors
Errors in data structures or external database access
Behavior or performance errors
Initialization and termination errors

Definition by ISTQB

black box testing: Testing, either functional or non-functional, without reference to the internal structure of the component or system.
black box test design technique: Procedure to derive and/or select test cases based on an analysis of the specification, either functional or non-functional, of a component or system without reference to its internal structure.
answer Mar 8 by Arunkumaarts
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Black box testing is defined as a testing technique in which functionality of the Application Under Test (AUT) is tested without looking at the internal code structure, implementation details and knowledge of internal paths of the software. This type of testing is based entirely on software requirements and specifications.

Types of Black Box Testing
There are many types of Black Box Testing but the following are the prominent ones -

Functional testing - This black box testing type is related to the functional requirements of a system; it is done by software testers.
Non-functional testing - This type of black box testing is not related to testing of specific functionality, but non-functional requirements such as performance, scalability, usability.
Regression testing - Regression Testing is done after code fixes, upgrades or any other system maintenance to check the new code has not affected the existing code.

answer Mar 10 by Sheetal Gawade
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