HUnit is a unit testing framework for Haskell, similar to JUnit for Java. I have made HUnit 1.0 available at <http://hunit.sourceforge.net>.
From the User's Guide:
A test-centered methodology for software development is most effective when tests are easy to create, change, and execute. The JUnit tool pioneered support for test-first development in Java. HUnit is an adaptation of JUnit to Haskell, a general-purpose, purely functional programming language. With HUnit, as with JUnit, you can easily create tests, name them, group them into suites, and execute them, with the framework checking the results automatically. Test specification in HUnit is even more concise and flexible than in JUnit, thanks to the nature of the Haskell language. HUnit currently includes only a text-based test controller, but the framework is designed for easy extension. (Would anyone care to write a graphical test controller for HUnit?) Dean Herington