For more than four years this article has been waiting to be written. Now a rainy summer day can do wonders. Back in 2018, when I fell into Scheme, I needed a unit testing framework. I was digging into Scheme with coding exercises and wanted the quick feedback of my TDD cycle so see if I was on the right track. I did not know anything about modules, dependency management or how to get custom code in Scheme and searched the web for a small test framework. As minimalism is in the spirit of Scheme,...