Stefil is a young test framework that drops the common idea of *Unit testing and is based on instrumented defun's callable from the repl.
Its deftest macro expands to an instrumented defun that can call other functions (wow) and that can be called directly from the repl. It has Slime integration to inspect the result, it binds useful restarts, etc... For all the details see the home page
It is a Development tool that provides a test framework.
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