T - Definitions
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test harness
In software development, a test harness is a collection of software and test data used by developers to unit test software models during development.
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test-driven development (TDD)
Test-driven development (TDD), also called test-driven design, is a software programming method that interlaces unit testing, programming and refactoring on source code.
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What is a test case?
A test case is a set of actions performed on a system to determine if it satisfies software requirements and functions correctly.