funit is a unit testing framework for Fortran. Unit tests are written as Fortran fragments that use a small set of testing-specific keywords and functions. funit transforms these fragments into valid Fortran code, compiles, links, and runs them against the code under test. funit is {opinionated software}[http://www.oreillynet.com/pub/a/network/2005/08/30/ruby-rails-david-heinemeier-hansson.html], which values convention over configuration. Specifically, funit requires, * a Fortran 95 compiler, * tests to be stored along side the code under test, and * test files to be named appropriately.