Black Box Testing

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What Does Black Box Testing Mean?

Black box testing is a software testing technique that focuses on the analysis of software functionality, versus internal system mechanisms. Black box testing was developed as a method of analyzing client requirements, specifications and high-level design strategies.

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A black box software tester selects a set of valid and invalid input and code execution conditions and checks for valid output responses.

Black box testing is also known as functional testing or closed-box testing.

Techopedia Explains Black Box Testing

A search engine is a simple example of an application subject to routine black box testing. A search engine user enters text in a web browser’s search bar. The search engine then locates and retrieves related user data results (output).

Black box testing advantages include:

  • Simplicity: Facilitates testing of high-level designs and complex applications
  • Conserves resources: Testers focus on software functionality.
  • Test cases: Focusing on software functionality to facilitate quick test case development.
  • Provides flexibility: Specific programming knowledge is not required.

Black box testing also has certain disadvantages, as follows:

  • Test case/script design and maintenance may be problematic because black box testing tools depend on known inputs.
  • Graphical user interface (GUI) interaction may damage test scripts.
  • Testing only covers application functions.
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Margaret Rouse
Senior Editor
Margaret Rouse
Senior Editor

Margaret is an award-winning technical writer and teacher known for her ability to explain complex technical subjects to a non-technical business audience. Over the past twenty years, her IT definitions have been published by Que in an encyclopedia of technology terms and cited in articles by the New York Times, Time Magazine, USA Today, ZDNet, PC Magazine, and Discovery Magazine. She joined Techopedia in 2011. Margaret's idea of a fun day is helping IT and business professionals learn to speak each other’s highly specialized languages.