A sometimes overlooked value of software testing is that it enables fearless programming and constant refactoring. Since the design is often the first causuality of sitting down to code, having a complete test suite improves productively and allows for rapid change and experimentation. This report describes LIFT: the LIsp Framework for Testing. LIFT supports the construction of a hierarchical suite of tests that can be run in batch (for regression testing) or interactively (which suits the style of Lisp). The philosophy, design and use of LIFT are discussed and LIFT is compared with several other Lisp testing frameworks.

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