FReT (Framework for Regression Testing) is a unit test framework with interactive testing and authoring of tests. It is CLOS-based, along the lines of XPTEST and clos-unit: test cases are organized in suites that are arranged in an inheritance hierarchy, with fixtures attached to suites. All these are explicitly represented, which makes it easy for adding new cases and suites, or modifying existing ones. The API for this has been inspired by LIFT, though the names and syntax have been changed a little.