Bottom-Up Testing

What Does Bottom-Up Testing Mean?

Bottom-up testing is a specific type of integration testing that tests the lowest components of a code base first. More generally, it refers to a middle phase in software testing that involves taking integrated code units and testing them together, before testing an entire system or code base.
IT professionals refer to design assemblies, or groups of code modules that are evaluated for overall functioning, in integrated testing environments.

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Techopedia Explains Bottom-Up Testing

Bottom-up testing is the opposite of top-down testing, where the top integrated elements are tested first. Experts explain that while bottom-up testing can be useful in producing a smaller, independent test basis, it doesn’t provide the same kind of skeletal program demonstration design that top-down testing does. With bottom-up testing, developers build up to that scale where the program mainly coincides with the user interface. Some people see this as a kind of backward testing, but each individual developer team must decide for reasons of purpose and practicality which type of software testing suits the project better.

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Margaret Rouse
Technology Expert

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.