tap
- The [Test Anything Protocol](http://testanything.org/) is a text-based interface between test scripts and a test harness. A wide range of tools exist for running, rendering and analyzing test results. By writing your Prolog tests with tap, you get access to all this testing infrastructure. For example, [interactive HTML output](http://www.spurkis.org/TAP-Formatter-HTML/test-output.html).